VM Options Explorer - OpenJDK17 HotSpot

OpenJDK HotSpot Options added/removed OpenJDK options also hosted on foojay.io
VM Options	JDK6	JDK7	JDK8	JDK9	JDK10	JDK11	JDK12	JDK13	JDK14	JDK15	JDK16	JDK17
Intrinsics	JDK6	JDK7	JDK8	JDK9	JDK10	JDK11	JDK12	JDK13	JDK14	JDK15	JDK16	JDK17

GraalVM 21.0.0
JDK8		JDK11
Community	Enterprise	Community	Enterprise
	EE-only		EE-only

GraalVM native-image 21.0.0
JDK8		JDK11
Community	Enterprise	Community	Enterprise
	EE-only		EE-only

OpenJ9
OpenJ9

Azul
Zing		Zulu
JDK8	JDK11	JDK8	JDK11	JDK13	JDK15	JDK16
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Amazon
Corretto 8	Corretto 11
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Hey Reader! If these notes float your boat you'll find more great JVM info in this book I co-wrote! Optimizing Java: Practical techniques for improving JVM application performance

Name	Since	Deprecated	Type	OS	CPU	Component	Default	Availability	Description	Defined in
AOTLibrary	OpenJDK9		ccstrlist			runtime	NULL	product	EXPERIMENTAL	share/runtime/globals.hpp
AVX3Threshold	OpenJDK11		int		x86		4096 range(0, max_jint)	product	DIAGNOSTIC	cpu/x86/globals_x86.hpp
AbortVMOnCompilationFailure	OpenJDK11		bool			compiler	false	product	DIAGNOSTIC	share/compiler/compiler_globals.hpp
AbortVMOnExceptionMessage	OpenJDK6		ccstr			runtime	NULL	product	DIAGNOSTIC	share/runtime/globals.hpp
AbortVMOnException	OpenJDK6		ccstr			runtime	NULL	product	DIAGNOSTIC	share/runtime/globals.hpp
AbortVMOnSafepointTimeout	OpenJDK11		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
AbortVMOnVMOperationTimeoutDelay	OpenJDK11		intx			runtime	1000 range(0, max_intx)	product	DIAGNOSTIC	share/runtime/globals.hpp
AbortVMOnVMOperationTimeout	OpenJDK11		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
ActiveProcessorCount	OpenJDK10		int			gc	-1	product	Specify the CPU count the VM should use and report as active	share/gc/shared/gc_globals.hpp
AdaptiveSizeDecrementScaleFactor	OpenJDK6		uintx			gc	4 range(1, max_uintx)	product	Adaptive size scale down factor for shrinking	share/gc/shared/gc_globals.hpp
AdaptiveSizeMajorGCDecayTimeScale	OpenJDK6		uintx			gc	10 range(0, max_uintx)	product	Time scale over which major costs decay	share/gc/shared/gc_globals.hpp
AdaptiveSizePolicyCollectionCostMargin	OpenJDK6		uintx			gc	50 range(0, 100)	product	If collection costs are within margin, reduce both by full delta	share/gc/shared/gc_globals.hpp
AdaptiveSizePolicyInitializingSteps	OpenJDK6		uintx			gc	20 range(0, max_uintx)	product	Number of steps where heuristics is used before data is used	share/gc/shared/gc_globals.hpp
AdaptiveSizePolicyOutputInterval	OpenJDK6		uintx			gc	0 range(0, max_uintx)	product	Collection interval for printing information; zero means never	share/gc/shared/gc_globals.hpp
AdaptiveSizePolicyReadyThreshold	OpenJDK6		uintx			gc	5	develop	Number of collections before the adaptive sizing is started	share/gc/shared/gc_globals.hpp
AdaptiveSizePolicyWeight	OpenJDK6		uintx			gc	10 range(0, 100)	product	Weight given to exponential resizing, between 0 and 100	share/gc/shared/gc_globals.hpp
AdaptiveSizeThroughPutPolicy	OpenJDK6		uintx			gc	0 range(0, 1)	product	Policy for changing generation size for throughput goals	share/gc/shared/gc_globals.hpp
AdaptiveTimeWeight	OpenJDK6		uintx			gc	25 range(0, 100)	product	Weight given to time in adaptive policy, between 0 and 100	share/gc/shared/gc_globals.hpp
AdjustStackSizeForTLS	OpenJDK14		bool	linux			false	product	Increase the thread stack size to include space for glibc static thread-local storage (TLS) if true	os/linux/globals_linux.hpp
AggressiveHeap	OpenJDK10		bool			gc	false	product	Optimize heap options for long-running memory intensive apps	share/gc/shared/gc_globals.hpp
AggressiveUnboxing	OpenJDK8		bool			c2	true	product	DIAGNOSTIC	share/opto/c2_globals.hpp
AliasLevel	OpenJDK6		intx			c2	3 range(0, 3)	product	0 for no aliasing, 1 for oop/field/static/array split, 2 for class split, 3 for unique instances	share/opto/c2_globals.hpp
AlignVector	OpenJDK7		bool			c2	true	product	Perform vector store/load alignment in loop	share/opto/c2_globals.hpp
AllocateHeapAt	OpenJDK10		ccstr			runtime	NULL	product	Path to the directory where a temporary file will be created to use as the backing store for Java Heap.	share/runtime/globals.hpp
AllocateInstancePrefetchLines	OpenJDK6		intx			runtime	1 range(1, 64)	product	Number of lines to prefetch ahead of instance allocation pointer	share/runtime/globals.hpp
AllocatePrefetchDistance	OpenJDK6		intx			runtime	-1	product	Distance to prefetch ahead of allocation pointer. -1: use system-specific value (automatically determined	share/runtime/globals.hpp
AllocatePrefetchInstr	OpenJDK6		intx			runtime	0	product	Select instruction to prefetch ahead of allocation pointer	share/runtime/globals.hpp
AllocatePrefetchLines	OpenJDK6		intx			runtime	3 range(1, 64)	product	Number of lines to prefetch ahead of array allocation pointer	share/runtime/globals.hpp
AllocatePrefetchStepSize	OpenJDK6		intx			runtime	16 range(1, 512)	product	Step size in bytes of sequential prefetch instructions	share/runtime/globals.hpp
AllocatePrefetchStyle	OpenJDK6		intx			runtime	1 range(0, 3)	product	0 = no prefetch, 1 = generate prefetch instructions for each allocation, 2 = use TLAB watermark to gate allocation prefetch, 3 = generate one prefetch instruction per cache line	share/runtime/globals.hpp
AllowArchivingWithJavaAgent	OpenJDK12		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
AllowExtshm	OpenJDK9		bool	aix			false	product	Allow VM to run with EXTSHM=ON.	os/aix/globals_aix.hpp
AllowParallelDefineClass	OpenJDK6		bool			runtime	false	product	Allow parallel defineClass requests for class loaders registering as parallel capable	share/runtime/globals.hpp
AllowRedefinitionToAddDeleteMethods	OpenJDK13	Deprecated in JDK13	bool			runtime	false	product	(Deprecated) Allow redefinition to add and delete private static or final methods for compatibility with old releases	share/runtime/globals.hpp
AllowUserSignalHandlers	OpenJDK6		bool			runtime	false	product	Application will install primary signal handlers for the JVM (Unix only)	share/runtime/globals.hpp
AllowVectorizeOnDemand	OpenJDK9		bool			c2	true	product	Globally supress vectorization set in VectorizeMethod	share/opto/c2_globals.hpp
AlwaysActAsServerClassMachine	OpenJDK6		bool			gc	false	product	Always act like a server-class machine	share/gc/shared/gc_globals.hpp
AlwaysAtomicAccesses	OpenJDK9		bool			runtime	false	product	EXPERIMENTAL	share/runtime/globals.hpp
AlwaysCompileLoopMethods	OpenJDK6		bool			runtime	false	product	When using recompilation, never interpret methods containing loops	share/runtime/globals.hpp
AlwaysIncrementalInline	OpenJDK7		bool			c2	false	develop	do all inlining incrementally	share/opto/c2_globals.hpp
AlwaysLockClassLoader	OpenJDK6	Deprecated in JDK17 Obsoleted in JDK18 Expired in JDK19	bool			runtime	false	product	(Deprecated) Require the VM to acquire the class loader lock before calling loadClass() even for class loaders registering as parallel capable	share/runtime/globals.hpp
AlwaysPreTouch	OpenJDK6		bool			gc	false	product	Force all freshly committed pages to be pre-touched	share/gc/shared/gc_globals.hpp
AlwaysRestoreFPU	OpenJDK6		bool			runtime	false	product	Restore the FPU control word after every JNI call (expensive)	share/runtime/globals.hpp
AlwaysSafeConstructors	OpenJDK9		bool			runtime	false	product	EXPERIMENTAL	share/runtime/globals.hpp
AlwaysTenure	OpenJDK6		bool			gc	false	product	Always tenure objects in eden (ParallelGC only)	share/gc/shared/gc_globals.hpp
ArchiveClassesAtExit	OpenJDK13		ccstr			runtime	NULL	product	The path and name of the dynamic archive file	share/runtime/globals.hpp
ArchiveRelocationMode	OpenJDK14		intx			runtime	0 range(0, 2)	product	DIAGNOSTIC	share/runtime/globals.hpp
ArrayAllocatorMallocLimit	OpenJDK7		size_t			runtime	(size_t)-1	product	EXPERIMENTAL	share/runtime/globals.hpp
ArrayCopyLoadStoreMaxElem	OpenJDK9		intx			c2	8 range(0, max_intx)	product	Maximum number of arraycopy elements inlined as a sequence ofloads/stores	share/opto/c2_globals.hpp
ArrayCopyPartialInlineSize	OpenJDK16		intx			c2	-1 range(-1, 64)	product	DIAGNOSTIC	share/opto/c2_globals.hpp
AssertOnSuspendWaitFailure	OpenJDK6		bool			runtime	false	product	Assert/Guarantee on external suspend wait failure	share/runtime/globals.hpp
AssertRangeCheckElimination	OpenJDK8		bool			c1	false	develop	Assert Range Check Elimination	share/c1/c1_globals.hpp
AsyncDeflationInterval	OpenJDK15		intx			runtime	250 range(0, max_jint)	product	DIAGNOSTIC	share/runtime/globals.hpp
AutoBoxCacheMax	OpenJDK6		intx			c2	128 range(0, max_jint)	product	Sets max value cached by the java.lang.Integer autobox cache	share/opto/c2_globals.hpp
AvgMonitorsPerThreadEstimate	OpenJDK16		size_t			runtime	1024 range(0, max_uintx)	product	DIAGNOSTIC	share/runtime/globals.hpp
AvoidUnalignedAccesses	OpenJDK9		bool		aarch64		false	product	Avoid generating unaligned memory accesses	cpu/aarch64/globals_aarch64.hpp
BCEATraceLevel	OpenJDK6		intx			compiler	0 range(0, 3)	product	How much tracing to do of bytecode escape analysis estimates (0-3)	share/compiler/compiler_globals.hpp
BackgroundCompilation	OpenJDK6		bool		aarch64		true	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
BackgroundCompilation	OpenJDK6		bool		arm		true	define_pd_global		cpu/arm/c2_globals_arm.hpp
BackgroundCompilation	OpenJDK6		bool			compiler	false	define_pd_global		share/compiler/compiler_globals_pd.hpp
BackgroundCompilation	OpenJDK6		bool			runtime		product_pd	A thread requesting compilation is not blocked during compilation	share/runtime/globals.hpp
BackgroundCompilation	OpenJDK6		bool		ppc		true	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
BackgroundCompilation	OpenJDK6		bool		s390		true	define_pd_global		cpu/s390/c2_globals_s390.hpp
BackgroundCompilation	OpenJDK6		bool		x86		true	define_pd_global		cpu/x86/c1_globals_x86.hpp
BailoutAfterHIR	OpenJDK6		bool			c1	false	develop	bailout of compilation after building of HIR	share/c1/c1_globals.hpp
BailoutAfterLIR	OpenJDK6		bool			c1	false	develop	bailout of compilation after building of LIR	share/c1/c1_globals.hpp
BailoutOnExceptionHandlers	OpenJDK6		bool			c1	false	develop	bailout of compilation for methods with exception handlers	share/c1/c1_globals.hpp
BailoutToInterpreterForThrows	OpenJDK6		bool			c2	false	develop	Compiled methods which throws/catches exceptions will be deopt and intp.	share/opto/c2_globals.hpp
BaseFootPrintEstimate	OpenJDK6		size_t			gc	256*M range(0, max_uintx)	product	Estimate of footprint other than Java Heap	share/gc/shared/gc_globals.hpp
BciProfileWidth	OpenJDK6		intx			runtime	2	develop	Number of return bci's to record in ret profile	share/runtime/globals.hpp
BiasedLockingBulkRebiasThreshold	OpenJDK6	Deprecated in JDK15 Obsoleted in JDK18 Expired in JDK19	intx			runtime	20 range(0, max_intx)	product	(Deprecated) Threshold of number of revocations per type to try to rebias all objects in the heap of that type	share/runtime/globals.hpp
BiasedLockingBulkRevokeThreshold	OpenJDK6	Deprecated in JDK15 Obsoleted in JDK18 Expired in JDK19	intx			runtime	40 range(0, max_intx)	product	(Deprecated) Threshold of number of revocations per type to permanently revoke biases of all objects in the heap of that type	share/runtime/globals.hpp
BiasedLockingDecayTime	OpenJDK6	Deprecated in JDK15 Obsoleted in JDK18 Expired in JDK19	intx			runtime	25000 range(500, max_intx)	product	(Deprecated) Decay time (in milliseconds) to re-enable bulk rebiasing of a type after previous bulk rebias	share/runtime/globals.hpp
BiasedLockingStartupDelay	OpenJDK6	Deprecated in JDK15 Obsoleted in JDK18 Expired in JDK19	intx			runtime	0 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran)))	product	(Deprecated) Number of milliseconds to wait before enabling biased locking	share/runtime/globals.hpp
BinarySwitchThreshold	OpenJDK6		intx			runtime	5	develop	Minimal number of lookupswitch entries for rewriting to binary switch	share/runtime/globals.hpp
BlockLayoutByFrequency	OpenJDK6		bool			c2	true	product	Use edge frequencies to drive block ordering	share/opto/c2_globals.hpp
BlockLayoutMinDiamondPercentage	OpenJDK6		intx			c2	20 range(0, 100)	product	Miniumum %% of a successor (predecessor) for which block layout a will allow a fork (join) in a single chain	share/opto/c2_globals.hpp
BlockLayoutRotateLoops	OpenJDK6		bool			c2	true	product	Allow back branches to be fall throughs in the block layout	share/opto/c2_globals.hpp
BlockZeroingLowLimit	OpenJDK6		intx		aarch64		256 range(1, max_jint)	product	Minimum size in bytes when block zeroing will be used	cpu/aarch64/globals_aarch64.hpp
BootstrapJVMCI	OpenJDK9		bool			jvmci	false	product	EXPERIMENTAL	share/jvmci/jvmci_globals.hpp
BreakAtNode	OpenJDK6		intx			c2	0	notproduct	Break at construction of this Node (either _idx or _debug_idx)	share/opto/c2_globals.hpp
BytecodeVerificationLocal	OpenJDK6		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
BytecodeVerificationRemote	OpenJDK6		bool			runtime	true	product	DIAGNOSTIC	share/runtime/globals.hpp
C1Breakpoint	OpenJDK6		bool			c1	false	develop	Sets a breakpoint at entry of each compiled method	share/c1/c1_globals.hpp
C1InlineStackLimit	OpenJDK15		intx			c1	10 range(0, max_jint)	product	inlining only allowed for methods which don't exceed this number of expression stack and local slots	share/c1/c1_globals.hpp
C1MaxInlineLevel	OpenJDK15		intx			c1	9 range(0, max_jint)	product	The maximum number of nested calls that are inlined by C1	share/c1/c1_globals.hpp
C1MaxInlineSize	OpenJDK15		intx			c1	35 range(0, max_jint)	product	The maximum bytecode size of a method to be inlined by C1	share/c1/c1_globals.hpp
C1MaxRecursiveInlineLevel	OpenJDK15		intx			c1	1 range(0, max_jint)	product	maximum number of nested recursive calls that are inlined by C1	share/c1/c1_globals.hpp
C1MaxTrivialSize	OpenJDK15		intx			c1	6 range(0, max_jint)	product	The maximum bytecode size of a trivial method to be inlined by C1	share/c1/c1_globals.hpp
C1OptimizeVirtualCallProfiling	OpenJDK6		bool			c1	true	product	Use CHA and exact type results at call sites when updating MDOs	share/c1/c1_globals.hpp
C1ProfileBranches	OpenJDK6		bool			c1	true	product	Profile branches when generating code for updating MDOs	share/c1/c1_globals.hpp
C1ProfileCalls	OpenJDK6		bool			c1	true	product	Profile calls when generating code for updating MDOs	share/c1/c1_globals.hpp
C1ProfileCheckcasts	OpenJDK6		bool			c1	true	product	Profile checkcasts when generating code for updating MDOs	share/c1/c1_globals.hpp
C1ProfileInlinedCalls	OpenJDK6		bool			c1	true	product	Profile inlined calls when generating code for updating MDOs	share/c1/c1_globals.hpp
C1ProfileVirtualCalls	OpenJDK6		bool			c1	true	product	Profile virtual calls when generating code for updating MDOs	share/c1/c1_globals.hpp
C1UpdateMethodData	OpenJDK6		bool			c1	trueInTiered	product	Update MethodData*s in Tier1-generated code	share/c1/c1_globals.hpp
CIBreakAtOSR	OpenJDK6		intx			compiler	-1	develop	The id of osr compilation to break at	share/compiler/compiler_globals.hpp
CIBreakAt	OpenJDK6		intx			compiler	-1	develop	The id of compilation to break at	share/compiler/compiler_globals.hpp
CICompileNatives	OpenJDK6		bool			compiler	true	develop	compile native methods if supported by the compiler	share/compiler/compiler_globals.hpp
CICompileOSR	OpenJDK6		bool		aarch64		true	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
CICompileOSR	OpenJDK6		bool		arm		true	define_pd_global		cpu/arm/c2_globals_arm.hpp
CICompileOSR	OpenJDK6		bool			compiler		develop_pd	compile on stack replacement methods if supported by the compiler	share/compiler/compiler_globals.hpp
CICompileOSR	OpenJDK6		bool		ppc		true	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
CICompileOSR	OpenJDK6		bool		s390		true	define_pd_global		cpu/s390/c2_globals_s390.hpp
CICompileOSR	OpenJDK6		bool		x86		true	define_pd_global		cpu/x86/c1_globals_x86.hpp
CICompilerCountPerCPU	OpenJDK6		bool			compiler	false	product	1 compiler thread for log(N CPUs)	share/compiler/compiler_globals.hpp
CICompilerCount	OpenJDK6		intx			runtime	CI_COMPILER_COUNT range(0, max_jint)	product	Number of compiler threads to run	share/runtime/globals.hpp
CICountOSR	OpenJDK6		bool			compiler	false	develop	use a separate counter when assigning ids to osr compilations	share/compiler/compiler_globals.hpp
CICrashAt	OpenJDK8		intx			compiler	-1	notproduct	id of compilation to trigger assert in compiler thread for the purpose of testing, e.g. generation of replay data	share/compiler/compiler_globals.hpp
CIObjectFactoryVerify	OpenJDK6		bool			compiler	false	notproduct	enable potentially expensive verification in ciObjectFactory	share/compiler/compiler_globals.hpp
CIPrintCompileQueue	OpenJDK6		bool			compiler	false	product	DIAGNOSTIC	share/compiler/compiler_globals.hpp
CIPrintCompilerName	OpenJDK6		bool			compiler	false	develop	when CIPrint is active, print the name of the active compiler	share/compiler/compiler_globals.hpp
CIPrintMethodCodes	OpenJDK6		bool			compiler	false	develop	print method bytecodes of the compiled code	share/compiler/compiler_globals.hpp
CIPrintRequests	OpenJDK6		bool			compiler	false	develop	display every request for compilation	share/compiler/compiler_globals.hpp
CIPrintTypeFlow	OpenJDK6		bool			compiler	false	develop	print the results of ciTypeFlow analysis	share/compiler/compiler_globals.hpp
CIStartOSR	OpenJDK6		intx			compiler	0	develop	The id of the first osr compilation to permit (CICountOSR must be on)	share/compiler/compiler_globals.hpp
CIStart	OpenJDK6		intx			compiler	0	develop	The id of the first compilation to permit	share/compiler/compiler_globals.hpp
CIStopOSR	OpenJDK6		intx			compiler	max_jint	develop	The id of the last osr compilation to permit (CICountOSR must be on)	share/compiler/compiler_globals.hpp
CIStop	OpenJDK6		intx			compiler	max_jint	develop	The id of the last compilation to permit	share/compiler/compiler_globals.hpp
CITimeEach	OpenJDK6		bool			compiler	false	develop	display timing information after each successful compilation	share/compiler/compiler_globals.hpp
CITimeVerbose	OpenJDK9		bool			compiler	false	develop	be more verbose in compilation timings	share/compiler/compiler_globals.hpp
CITime	OpenJDK6		bool			compiler	false	product	collect timing information for compilation	share/compiler/compiler_globals.hpp
CITraceTypeFlow	OpenJDK6		bool			compiler	false	develop	detailed per-bytecode tracing of ciTypeFlow analysis	share/compiler/compiler_globals.hpp
CSEArrayLength	OpenJDK6		bool		aarch64		false	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
CSEArrayLength	OpenJDK6		bool		arm		true	define_pd_global		cpu/arm/c1_globals_arm.hpp
CSEArrayLength	OpenJDK6		bool			c1		develop_pd	Create separate nodes for length in array accesses	share/c1/c1_globals.hpp
CSEArrayLength	OpenJDK6		bool		ppc		true	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
CSEArrayLength	OpenJDK6		bool		s390		true	define_pd_global		cpu/s390/c1_globals_s390.hpp
CSEArrayLength	OpenJDK6		bool		x86		false	define_pd_global		cpu/x86/c1_globals_x86.hpp
CalculateClassFingerprint	OpenJDK10		bool			runtime	false	product	Calculate class fingerprint	share/runtime/globals.hpp
CanonicalizeNodes	OpenJDK6		bool			c1	true	develop	Canonicalize graph nodes	share/c1/c1_globals.hpp
CheckCompressedOops	OpenJDK6		bool			runtime	true	notproduct	Generate checks in encoding/decoding code in debug VM	share/runtime/globals.hpp
CheckIntrinsics	OpenJDK9		bool			runtime	true	product	DIAGNOSTIC	share/runtime/globals.hpp
CheckJNICalls	OpenJDK6		bool			runtime	false	product	Verify all arguments to JNI calls	share/runtime/globals.hpp
CheckMemoryInitialization	OpenJDK6		bool			runtime	false	notproduct	Check memory initialization	share/runtime/globals.hpp
CheckUnhandledOops	OpenJDK6		bool			runtime	false	develop	Check for unhandled oops in VM code	share/runtime/globals.hpp
CheckZapUnusedHeapArea	OpenJDK6		bool			runtime	false	develop	Check zapping of unused heap space	share/runtime/globals.hpp
ClassUnloadingWithConcurrentMark	OpenJDK8		bool			runtime	true	product	Do unloading of classes with a concurrent marking cycle	share/runtime/globals.hpp
ClassUnloading	OpenJDK6		bool			runtime	true	product	Do unloading of classes	share/runtime/globals.hpp
ClipInlining	OpenJDK6		bool			runtime	true	product	Clip inlining if aggregate method exceeds DesiredMethodLimit	share/runtime/globals.hpp
CodeCacheExpansionSize	OpenJDK6		intx		aarch64		32*K	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
CodeCacheExpansionSize	OpenJDK6		size_t		arm		32*K	define_pd_global		cpu/arm/c2_globals_arm.hpp
CodeCacheExpansionSize	OpenJDK6		uintx			compiler	32*K	define_pd_global		share/compiler/compiler_globals_pd.hpp
CodeCacheExpansionSize	OpenJDK6		uintx			runtime		product_pd	Code cache expansion size (in bytes)	share/runtime/globals.hpp
CodeCacheExpansionSize	OpenJDK6		uintx		ppc		32*K	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
CodeCacheExpansionSize	OpenJDK6		uintx		s390		64*K	define_pd_global		cpu/s390/c2_globals_s390.hpp
CodeCacheExpansionSize	OpenJDK6		uintx		x86		32*K	define_pd_global		cpu/x86/c1_globals_x86.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx		aarch64		1	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx		arm		6	define_pd_global		cpu/arm/c2_globals_arm.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx			compiler	1	define_pd_global		share/compiler/compiler_globals_pd.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx			runtime		product_pd	DIAGNOSTIC	share/runtime/globals.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx		ppc		1	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx		s390		4	define_pd_global		cpu/s390/c2_globals_s390.hpp
CodeCacheMinBlockLength	OpenJDK6		uintx		x86		1	define_pd_global		cpu/x86/c1_globals_x86.hpp
CodeCacheMinimumUseSpace	OpenJDK8		uintx		aarch64		400*K	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
CodeCacheMinimumUseSpace	OpenJDK8		size_t		arm		400*K	define_pd_global		cpu/arm/c2_globals_arm.hpp
CodeCacheMinimumUseSpace	OpenJDK8		uintx			compiler	200*K	define_pd_global		share/compiler/compiler_globals_pd.hpp
CodeCacheMinimumUseSpace	OpenJDK8		uintx			runtime		develop_pd	Minimum code cache size (in bytes) required to start VM.	share/runtime/globals.hpp
CodeCacheMinimumUseSpace	OpenJDK8		uintx		ppc		400*K	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
CodeCacheMinimumUseSpace	OpenJDK8		uintx		s390		400*K	define_pd_global		cpu/s390/c2_globals_s390.hpp
CodeCacheMinimumUseSpace	OpenJDK8		uintx		x86		400*K	define_pd_global		cpu/x86/c1_globals_x86.hpp
CodeCacheSegmentSize	OpenJDK6		uintx		aarch64		64 TIERED_ONLY(+64)	define_pd_global	// Tiered compilation has large code-entry alignment.	cpu/aarch64/globals_aarch64.hpp
CodeCacheSegmentSize	OpenJDK6		uintx		arm		64 TIERED_ONLY(+64)	define_pd_global	// Tiered compilation has large code-entry alignment.	cpu/arm/globals_arm.hpp
CodeCacheSegmentSize	OpenJDK6		uintx			runtime		develop_pd	Code cache segment size (in bytes) - smallest unit of allocation	share/runtime/globals.hpp
CodeCacheSegmentSize	OpenJDK6		uintx		ppc		128	define_pd_global		cpu/ppc/globals_ppc.hpp
CodeCacheSegmentSize	OpenJDK6		uintx		s390		256	define_pd_global		cpu/s390/globals_s390.hpp
CodeCacheSegmentSize	OpenJDK6		uintx		x86		64 TIERED_ONLY(+64)	define_pd_global	// Tiered compilation has large code-entry alignment.	cpu/x86/globals_x86.hpp
CodeCacheSegmentSize	OpenJDK6		uintx		zero		64 TIERED_ONLY(+64)	define_pd_global	// Tiered compilation has large code-entry alignment.	cpu/zero/globals_zero.hpp
CodeEntryAlignment	OpenJDK6		intx		aarch64		64	define_pd_global		cpu/aarch64/globals_aarch64.hpp
CodeEntryAlignment	OpenJDK6		intx		arm		16	define_pd_global		cpu/arm/globals_arm.hpp
CodeEntryAlignment	OpenJDK6		intx			runtime		develop_pd	Code entry alignment for generated code (in bytes)	share/runtime/globals.hpp
CodeEntryAlignment	OpenJDK6		intx		ppc		128	define_pd_global		cpu/ppc/globals_ppc.hpp
CodeEntryAlignment	OpenJDK6		intx		s390		64	define_pd_global		cpu/s390/globals_s390.hpp
CodeEntryAlignment	OpenJDK6		intx		x86		16	define_pd_global		cpu/x86/globals_x86.hpp
CodeEntryAlignment	OpenJDK6		intx		zero		32	define_pd_global		cpu/zero/globals_zero.hpp
CollectIndexSetStatistics	OpenJDK6		bool			runtime	false	notproduct	Collect information about IndexSets	share/runtime/globals.hpp
CommentedAssembly	OpenJDK6		bool			c1	trueInDebug	develop	Show extra info in PrintNMethods output	share/c1/c1_globals.hpp
CompactStrings	OpenJDK9		bool		aarch64		true	define_pd_global		cpu/aarch64/globals_aarch64.hpp
CompactStrings	OpenJDK9		bool		arm		false	define_pd_global		cpu/arm/globals_arm.hpp
CompactStrings	OpenJDK9		bool			runtime		product_pd	Enable Strings to use single byte chars in backing store	share/runtime/globals.hpp
CompactStrings	OpenJDK9		bool		ppc		true	define_pd_global		cpu/ppc/globals_ppc.hpp
CompactStrings	OpenJDK9		bool		s390		true	define_pd_global		cpu/s390/globals_s390.hpp
CompactStrings	OpenJDK9		bool		x86		true	define_pd_global		cpu/x86/globals_x86.hpp
CompactStrings	OpenJDK9		bool		zero		false	define_pd_global		cpu/zero/globals_zero.hpp
CompilationMode	OpenJDK14		ccstr			compiler	default	product	Compilation modes: default: normal tiered compilation; quick-only: C1-only mode; high-only: C2/JVMCI-only mode; high-only-quick-internal: C2/JVMCI-only mode, with JVMCI compiler compiled with C1.	share/compiler/compiler_globals.hpp
CompileCommandFile	OpenJDK6		ccstr			compiler	NULL	product	Read compiler commands from this file [.hotspot_compiler]	share/compiler/compiler_globals.hpp
CompileCommand	OpenJDK6		ccstrlist			compiler	Prepend to .hotspot_compiler; e.g. log,java/lang/String.	product		share/compiler/compiler_globals.hpp
CompileOnly	OpenJDK6		ccstrlist			compiler	List of methods (pkg/class.name) to restrict compilation to	product		share/compiler/compiler_globals.hpp
CompileThresholdScaling	OpenJDK9		double			compiler	1.0 range(0.0, DBL_MAX)	product	Factor to control when first compilation happens (both with and without tiered compilation): values greater than 1.0 delay counter overflow, values between 0 and 1.0 rush counter overflow, value of 1.0 leaves compilation thresholds unchanged value of 0.0 is equivalent to -Xint. Flag can be set as per-method option. If a value is specified for a method, compilation thresholds for that method are scaled by both the value of the global flag and the value of the per-method flag.	share/compiler/compiler_globals.hpp
CompileThreshold	OpenJDK6		intx		aarch64		1500	define_pd_global		cpu/aarch64/c1_globals_aarch64.hpp
CompileThreshold	OpenJDK6		intx		arm		10000	define_pd_global		cpu/arm/c2_globals_arm.hpp
CompileThreshold	OpenJDK6		intx			compiler	0	define_pd_global		share/compiler/compiler_globals_pd.hpp
CompileThreshold	OpenJDK6		intx			runtime		product_pd	number of interpreted method invocations before (re-)compiling	share/runtime/globals.hpp
CompileThreshold	OpenJDK6		intx		ppc		1000	define_pd_global		cpu/ppc/c1_globals_ppc.hpp
CompileThreshold	OpenJDK6		intx		s390		10000	define_pd_global		cpu/s390/c2_globals_s390.hpp
CompileThreshold	OpenJDK6		intx		x86		1500	define_pd_global		cpu/x86/c1_globals_x86.hpp
CompilerDirectivesFile	OpenJDK9		ccstr			compiler	NULL	product	DIAGNOSTIC	share/compiler/compiler_globals.hpp
CompilerDirectivesIgnoreCompileCommands	OpenJDK9		bool			compiler	false	product	DIAGNOSTIC	share/compiler/compiler_globals.hpp
CompilerDirectivesLimit	OpenJDK9		int			compiler	50	product	DIAGNOSTIC	share/compiler/compiler_globals.hpp
CompilerDirectivesPrint	OpenJDK9		bool			compiler	false	product	DIAGNOSTIC	share/compiler/compiler_globals.hpp
CompilerThreadPriority	OpenJDK6		intx			runtime	-1 range(min_jint, max_jint)	product	The native priority at which compiler threads should run (-1 means no change)	share/runtime/globals.hpp
CompilerThreadStackSize	OpenJDK6		intx	aix	ppc		4096	define_pd_global		os_cpu/aix_ppc/globals_aix_ppc.hpp
CompilerThreadStackSize	OpenJDK6		intx	bsd	x86		512	define_pd_global		os_cpu/bsd_x86/globals_bsd_x86.hpp
CompilerThreadStackSize	OpenJDK6		intx	bsd	zero		0	define_pd_global		os_cpu/bsd_zero/globals_bsd_zero.hpp
CompilerThreadStackSize	OpenJDK6		intx	linux	aarch64		2048	define_pd_global		os_cpu/linux_aarch64/globals_linux_aarch64.hpp
CompilerThreadStackSize	OpenJDK6		intx	linux	arm		512	define_pd_global		os_cpu/linux_arm/globals_linux_arm.hpp
CompilerThreadStackSize	OpenJDK6		intx	linux	ppc		4096	define_pd_global		os_cpu/linux_ppc/globals_linux_ppc.hpp
CompilerThreadStackSize	OpenJDK6		intx	linux	s390		2048	define_pd_global		os_cpu/linux_s390/globals_linux_s390.hpp
CompilerThreadStackSize	OpenJDK6		intx	linux	x86		512	define_pd_global		os_cpu/linux_x86/globals_linux_x86.hpp
CompilerThreadStackSize	OpenJDK6		intx	linux	zero		0	define_pd_global		os_cpu/linux_zero/globals_linux_zero.hpp
CompilerThreadStackSize	OpenJDK6		intx			runtime		product_pd	Compiler Thread Stack Size (in Kbytes)	share/runtime/globals.hpp
CompilerThreadStackSize	OpenJDK6		intx	windows	aarch64		0	define_pd_global		os_cpu/windows_aarch64/globals_windows_aarch64.hpp
CompilerThreadStackSize	OpenJDK6		intx	windows	x86		0	define_pd_global		os_cpu/windows_x86/globals_windows_x86.hpp
CompressedClassSpaceSize	OpenJDK8		size_t			runtime	1G range(1M, 3*G)	product	Maximum size of class area in Metaspace when compressed class pointers are used	share/runtime/globals.hpp
ComputeExactFPURegisterUsage	OpenJDK6		bool			c1	true	develop	Compute additional live set for fpu registers to simplify fpu stack merge (Intel only)	share/c1/c1_globals.hpp
ConcGCThreads	OpenJDK6		uint			gc	0	product	Number of threads concurrent gc will use	share/gc/shared/gc_globals.hpp
ConcGCYieldTimeout	OpenJDK6		intx			gc	0 range(0, max_intx)	develop	If non-zero, assert that GC threads yield within this number of milliseconds	share/gc/shared/gc_globals.hpp
ConditionalMoveLimit	OpenJDK6		intx		aarch64		3	define_pd_global		cpu/aarch64/c2_globals_aarch64.hpp
ConditionalMoveLimit	OpenJDK6		intx		arm		4	define_pd_global		cpu/arm/c2_globals_arm.hpp
ConditionalMoveLimit	OpenJDK6		intx			c2		product_pd	Limit of ops to make speculative when using CMOVE	share/opto/c2_globals.hpp
ConditionalMoveLimit	OpenJDK6		intx		ppc		3	define_pd_global		cpu/ppc/c2_globals_ppc.hpp
ConditionalMoveLimit	OpenJDK6		intx		s390		4	define_pd_global		cpu/s390/c2_globals_s390.hpp
ConditionalMoveLimit	OpenJDK6		intx		x86		3	define_pd_global		cpu/x86/c2_globals_x86.hpp
ContendedPaddingWidth	OpenJDK8		intx			runtime	128 range(0, 8192)	product	How many bytes to pad the fields/classes marked @Contended with	share/runtime/globals.hpp
ControlIntrinsic	OpenJDK16		ccstrlist			runtime	DIAGNOSTIC	product	Control intrinsics using a list of +/- (internal) names, separated by commas	share/runtime/globals.hpp
ConvertCmpD2CmpF	OpenJDK6		bool			c2	true	develop	Convert cmpD to cmpF when one input is constant in float range	share/opto/c2_globals.hpp
ConvertFloat2IntClipping	OpenJDK6		bool			c2	true	develop	Convert float2int clipping idiom to integer clipping	share/opto/c2_globals.hpp
CountBytecodes	OpenJDK6		bool			runtime	false	develop	Count number of bytecodes executed	share/runtime/globals.hpp
CountCompiledCalls	OpenJDK6		bool			runtime	false	develop	Count method invocations	share/runtime/globals.hpp
CountLinearScan	OpenJDK6		bool			c1	false	develop	collect statistic counters during LinearScan	share/c1/c1_globals.hpp
CounterDecayMinIntervalLength	OpenJDK6		intx			runtime	500	develop	The minimum interval (in milliseconds) between invocation of CounterDecay	share/runtime/globals.hpp
CounterHalfLifeTime	OpenJDK6		intx			runtime	30	develop	Half-life time of invocation counters (in seconds)	share/runtime/globals.hpp
CrashGCForDumpingJavaThread	OpenJDK6		bool			runtime	false	notproduct	Manually make GC thread crash then dump java stack trace; Test only	share/runtime/globals.hpp
CrashOnOutOfMemoryError	OpenJDK8		bool			runtime	false	product	JVM aborts, producing an error log and core/mini dump, on the first occurrence of an out-of-memory error thrown from JVM	share/runtime/globals.hpp
CreateCoredumpOnCrash	OpenJDK9		bool			runtime	true	product	Create core/mini dump on VM fatal error	share/runtime/globals.hpp
CriticalJNINatives	OpenJDK6	Deprecated in JDK16 Obsoleted in JDK17 Expired in JDK18	bool			runtime	false	product	(Deprecated) Check for critical JNI entry points	share/runtime/globals.hpp
DSCR_DPFD_PPC64	OpenJDK9		uint64_t		ppc		8	product	Power8 or later: DPFD (default prefetch depth) value of the Data Stream Control Register. 0: hardware default, 1: none, 2-7: min-max, 8: don't touch	cpu/ppc/globals_ppc.hpp
DSCR_PPC64	OpenJDK9		uint64_t		ppc		(uint64_t)-1	product	Power8 or later: Specify encoded value for Data Stream Control Register	cpu/ppc/globals_ppc.hpp
DSCR_URG_PPC64	OpenJDK9		uint64_t		ppc		8	product	Power8 or later: URG (depth attainment urgency) value of the Data Stream Control Register. 0: hardware default, 1: none, 2-7: min-max, 8: don't touch	cpu/ppc/globals_ppc.hpp
DTraceAllocProbes	OpenJDK6		bool			runtime	false	product	Enable dtrace probes for object allocation	share/runtime/globals.hpp
DTraceMethodProbes	OpenJDK6		bool			runtime	false	product	Enable dtrace probes for method-entry and method-exit	share/runtime/globals.hpp
DTraceMonitorProbes	OpenJDK6		bool			runtime	false	product	Enable dtrace probes for monitor events	share/runtime/globals.hpp
DebugDeoptimization	OpenJDK6		bool			runtime	false	develop	Tracing various information while debugging deoptimization	share/runtime/globals.hpp
DebugInlinedCalls	OpenJDK6		bool			c2	true	product	DIAGNOSTIC	share/opto/c2_globals.hpp
DebugNonSafepoints	OpenJDK6		bool			runtime	trueInDebug	product	DIAGNOSTIC	share/runtime/globals.hpp
DebugVtables	OpenJDK6		bool			runtime	false	develop	add debugging code to vtable dispatch	share/runtime/globals.hpp
DeferInitialCardMark	OpenJDK6		bool			gc	false	product	DIAGNOSTIC	share/gc/shared/gc_globals.hpp
DeoptC1	OpenJDK6		bool			c1	true	develop	Use deoptimization in C1	share/c1/c1_globals.hpp
DeoptimizeALotInterval	OpenJDK6		intx			runtime	5	notproduct	Number of exits until DeoptimizeALot kicks in	share/runtime/globals.hpp
DeoptimizeALot	OpenJDK6		bool			runtime	false	develop	Deoptimize at every exit from the runtime system	share/runtime/globals.hpp
DeoptimizeNMethodBarriersALot	OpenJDK15		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
DeoptimizeObjectsALotInterval	OpenJDK16		uint64_t			runtime	5 range(0, max_jlong)	develop	Interval for DeoptimizeObjectsALot.	share/runtime/globals.hpp
DeoptimizeObjectsALotThreadCountAll	OpenJDK16		int			runtime	1 range(0, max_jint)	develop	The number of threads that revert optimizations based on escape analysis for all threads if DeoptimizeObjectsALot is enabled.	share/runtime/globals.hpp
DeoptimizeObjectsALotThreadCountSingle	OpenJDK16		int			runtime	1 range(0, max_jint)	develop	The number of threads that revert optimizations based on escape analysis for a single thread if DeoptimizeObjectsALot is enabled. The target thread is selected round robin.	share/runtime/globals.hpp
DeoptimizeObjectsALot	OpenJDK16		bool			runtime	false	develop	For testing purposes concurrent threads revert optimizations based on escape analysis at intervals given with DeoptimizeObjectsALotInterval=n. The thread count is given with DeoptimizeObjectsALotThreadCountSingle and DeoptimizeObjectsALotThreadCountAll.	share/runtime/globals.hpp
DeoptimizeOnlyAt	OpenJDK6		ccstrlist			runtime	A comma separated list of bcis to deoptimize at	notproduct		share/runtime/globals.hpp
DeoptimizeRandom	OpenJDK6		bool			runtime	false	develop	Deoptimize random frames on random exit from the runtime system	share/runtime/globals.hpp
DesiredMethodLimit	OpenJDK6		intx			compiler	8000	develop	The desired maximum method size (in bytecodes) after inlining	share/compiler/compiler_globals.hpp
DiagnoseSyncOnValueBasedClasses	OpenJDK16		intx			runtime	0 range(0, 2)	product	DIAGNOSTIC	share/runtime/globals.hpp
DisableAttachMechanism	OpenJDK6		bool			runtime	false	product	Disable mechanism that allows tools to attach to this VM	share/runtime/globals.hpp
DisableExplicitGC	OpenJDK6		bool			gc	false	product	Ignore calls to System.gc()	share/gc/shared/gc_globals.hpp
DisableIntrinsic	OpenJDK6		ccstrlist			runtime	DIAGNOSTIC	product	do not expand intrinsics whose (internal) names appear here	share/runtime/globals.hpp
DisablePrimordialThreadGuardPages	OpenJDK8		bool			runtime	false	product	EXPERIMENTAL	share/runtime/globals.hpp
DisplayVMOutputToStderr	OpenJDK6		bool			runtime	false	product	If DisplayVMOutput is true, display all VM output to stderr	share/runtime/globals.hpp
DisplayVMOutputToStdout	OpenJDK6		bool			runtime	false	product	If DisplayVMOutput is true, display all VM output to stdout	share/runtime/globals.hpp
DisplayVMOutput	OpenJDK6		bool			runtime	true	product	DIAGNOSTIC	share/runtime/globals.hpp
DoCEE	OpenJDK6		bool			c1	true	develop	Do Conditional Expression Elimination to simplify CFG	share/c1/c1_globals.hpp
DoEscapeAnalysis	OpenJDK6		bool			c2	true	product	Perform escape analysis	share/opto/c2_globals.hpp
DoReserveCopyInSuperWord	OpenJDK9		bool			c2	true	product	Create reserve copy of graph in SuperWord.	share/opto/c2_globals.hpp
DominatorSearchLimit	OpenJDK6		intx			c2	1000 range(0, max_jint)	product	DIAGNOSTIC	share/opto/c2_globals.hpp
DontCompileHugeMethods	OpenJDK6		bool			compiler	true	product	Do not compile methods > HugeMethodLimit	share/compiler/compiler_globals.hpp
DontYieldALotInterval	OpenJDK6		intx			runtime	10	develop	Interval between which yields will be dropped (milliseconds)	share/runtime/globals.hpp
DontYieldALot	OpenJDK6		bool	aix	ppc		false	define_pd_global		os_cpu/aix_ppc/globals_aix_ppc.hpp
DontYieldALot	OpenJDK6		bool	bsd	x86		false	define_pd_global		os_cpu/bsd_x86/globals_bsd_x86.hpp
DontYieldALot	OpenJDK6		bool	bsd	zero		false	define_pd_global		os_cpu/bsd_zero/globals_bsd_zero.hpp
DontYieldALot	OpenJDK6		bool	linux	aarch64		false	define_pd_global		os_cpu/linux_aarch64/globals_linux_aarch64.hpp
DontYieldALot	OpenJDK6		bool	linux	arm		false	define_pd_global		os_cpu/linux_arm/globals_linux_arm.hpp
DontYieldALot	OpenJDK6		bool	linux	ppc		false	define_pd_global		os_cpu/linux_ppc/globals_linux_ppc.hpp
DontYieldALot	OpenJDK6		bool	linux	s390		false	define_pd_global		os_cpu/linux_s390/globals_linux_s390.hpp
DontYieldALot	OpenJDK6		bool	linux	x86		false	define_pd_global		os_cpu/linux_x86/globals_linux_x86.hpp
DontYieldALot	OpenJDK6		bool	linux	zero		false	define_pd_global		os_cpu/linux_zero/globals_linux_zero.hpp
DontYieldALot	OpenJDK6		bool			runtime		product_pd	Throw away obvious excess yield calls	share/runtime/globals.hpp
DontYieldALot	OpenJDK6		bool	windows	aarch64		false	define_pd_global		os_cpu/windows_aarch64/globals_windows_aarch64.hpp
DontYieldALot	OpenJDK6		bool	windows	x86		false	define_pd_global		os_cpu/windows_x86/globals_windows_x86.hpp
DumpLoadedClassList	OpenJDK8		ccstr			runtime	NULL	product	Dump the names all loaded classes, that could be stored into the CDS archive, in the specified file	share/runtime/globals.hpp
DumpPerfMapAtExit	OpenJDK16		bool	linux			false	product	DIAGNOSTIC	os/linux/globals_linux.hpp
DumpPrivateMappingsInCore	OpenJDK11		bool	linux			true	product	DIAGNOSTIC	os/linux/globals_linux.hpp
DumpReplayDataOnError	OpenJDK8		bool			compiler	true	product	Record replay data for crashing compiler threads	share/compiler/compiler_globals.hpp
DumpSharedMappingsInCore	OpenJDK11		bool	linux			true	product	DIAGNOSTIC	os/linux/globals_linux.hpp
DumpSharedSpaces	OpenJDK6		bool			runtime	false	product	Special mode: JVM reads a class list, loads classes, builds shared spaces, and dumps the shared spaces to a file to be used in future JVM runs	share/runtime/globals.hpp
DynamicDumpSharedSpaces	OpenJDK13		bool			runtime	false	product	Dynamic archive	share/runtime/globals.hpp
DynamicallyResizeSystemDictionaries	OpenJDK10		bool			runtime	true	product	DIAGNOSTIC	share/runtime/globals.hpp
EagerInitialization	OpenJDK6		bool			runtime	false	develop	Eagerly initialize classes if possible	share/runtime/globals.hpp
EagerJVMCI	OpenJDK11		bool			jvmci	false	product	EXPERIMENTAL	share/jvmci/jvmci_globals.hpp
EagerXrunInit	OpenJDK6		bool			runtime	false	product	Eagerly initialize -Xrun libraries; allows startup profiling, but not all -Xrun libraries may support the state of the VM at this time	share/runtime/globals.hpp
EliminateAllocationArraySizeLimit	OpenJDK6		intx			c2	64 range(0, max_jint)	product	Array size (number of elements) limit for scalar replacement	share/opto/c2_globals.hpp
EliminateAllocationFieldsLimit	OpenJDK17		intx			c2	512 range(0, max_jint)	product	DIAGNOSTIC	share/opto/c2_globals.hpp
EliminateAllocations	OpenJDK6		bool			c2	true	product	Use escape analysis to eliminate allocations	share/opto/c2_globals.hpp
EliminateAutoBox	OpenJDK6		bool			c2	true	product	Control optimizations for autobox elimination	share/opto/c2_globals.hpp
EliminateBlocks	OpenJDK6		bool			c1	true	develop	Eliminate unneccessary basic blocks	share/c1/c1_globals.hpp
EliminateFieldAccess	OpenJDK6		bool			c1	true	develop	Optimize field loads and stores	share/c1/c1_globals.hpp
EliminateLocks	OpenJDK6		bool			c2	true	product	Coarsen locks when possible	share/opto/c2_globals.hpp
EliminateNestedLocks	OpenJDK6		bool			c2	true	product	Eliminate nested locks of the same object when possible	share/opto/c2_globals.hpp
EliminateNullChecks	OpenJDK6		bool			c1	true	develop	Eliminate unneccessary null checks	share/c1/c1_globals.hpp
EnableContended	OpenJDK8		bool			runtime	true	product	Enable @Contended annotation support	share/runtime/globals.hpp
EnableDynamicAgentLoading	OpenJDK9		bool			runtime	true	product	Allow tools to load agents with the attach mechanism	share/runtime/globals.hpp
EnableJVMCIProduct	OpenJDK14		bool			jvmci	false	product	EXPERIMENTAL	share/jvmci/jvmci_globals.hpp
EnableJVMCI	OpenJDK9		bool			jvmci	false	product	EXPERIMENTAL	share/jvmci/jvmci_globals.hpp
EnableJVMTIStackDepthAsserts	OpenJDK17		bool			runtime	true	notproduct	Enable JVMTI asserts related to stack depth checks	share/runtime/globals.hpp
EnableThreadSMRExtraValidityChecks	OpenJDK10		bool			runtime	true	product	DIAGNOSTIC	share/runtime/globals.hpp
EnableThreadSMRStatistics	OpenJDK10		bool			runtime	trueInDebug	product	DIAGNOSTIC	share/runtime/globals.hpp
EnableVectorAggressiveReboxing	OpenJDK16		bool			c2	false	product	EXPERIMENTAL	share/opto/c2_globals.hpp
EnableVectorReboxing	OpenJDK16		bool			c2	false	product	EXPERIMENTAL	share/opto/c2_globals.hpp
EnableVectorSupport	OpenJDK16		bool			c2	false	product	EXPERIMENTAL	share/opto/c2_globals.hpp
EpsilonElasticTLABDecay	OpenJDK11		bool			gc	true	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonElasticTLAB	OpenJDK11		bool			gc	true	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonMaxTLABSize	OpenJDK11		size_t			gc	4 * M range(1, max_intx)	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonMinHeapExpand	OpenJDK11		size_t			gc	128 * M range(1, max_intx)	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonPrintHeapSteps	OpenJDK11		size_t			gc	20 range(0, max_intx)	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonTLABDecayTime	OpenJDK11		size_t			gc	1000 range(1, max_intx)	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonTLABElasticity	OpenJDK11		double			gc	1.1 range(1.0, DBL_MAX)	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
EpsilonUpdateCountersStep	OpenJDK11		size_t			gc	1 * M range(1, max_intx)	product	EXPERIMENTAL	share/gc/epsilon/epsilon_globals.hpp
ErgoHeapSizeLimit	OpenJDK6		size_t			gc	0 range(0, max_uintx)	product	Maximum ergonomically set heap size (in bytes); zero means use MaxRAM * MaxRAMPercentage / 100	share/gc/shared/gc_globals.hpp
ErrorFileToStderr	OpenJDK11		bool			runtime	false	product	If true, error data is printed to stderr instead of a file	share/runtime/globals.hpp
ErrorFileToStdout	OpenJDK11		bool			runtime	false	product	If true, error data is printed to stdout instead of a file	share/runtime/globals.hpp
ErrorFile	OpenJDK6		ccstr			runtime	NULL	product	If an error occurs, save the error data to this file [default: ./hs_err_pid%p.log] (%p replaced with pid)	share/runtime/globals.hpp
ErrorHandlerTest	OpenJDK6		uintx			runtime	0 range(0, 17)	develop	If > 0, provokes an error after VM initialization; the value determines which error to provoke. See controlled_crash() in vmError.cpp.	share/runtime/globals.hpp
ErrorLogTimeout	OpenJDK9		uint64_t			runtime	2 * 60 range(0, (uint64_t)max_jlong/1000)	product	Timeout, in seconds, to limit the time spent on writing an error log in case of a crash.	share/runtime/globals.hpp
EscapeAnalysisTimeout	OpenJDK7		double			c2	20. DEBUG_ONLY(+40.) range(0, DBL_MAX)	product	Abort EA when it reaches time limit (in sec)	share/opto/c2_globals.hpp
EstimateArgEscape	OpenJDK6		bool			compiler	true	product	Analyze bytecodes to estimate escape state of arguments	share/compiler/compiler_globals.hpp
ExecutingUnitTests	OpenJDK9		bool			runtime	false	product	Whether the JVM is running unit tests or not	share/runtime/globals.hpp
ExitEscapeAnalysisOnTimeout	OpenJDK7		bool			c2	true	develop	Exit or throw assert in EA when it reaches time limit	share/opto/c2_globals.hpp
ExitOnFullCodeCache	OpenJDK6		bool			runtime	false	notproduct	Exit the VM if we fill the code cache	share/runtime/globals.hpp
ExitOnOutOfMemoryError	OpenJDK8		bool			runtime	false	product	JVM exits on the first occurrence of an out-of-memory error thrown from JVM	share/runtime/globals.hpp
ExpandLoadingBaseDecode_NN	OpenJDK9		bool		s390		true	product	DIAGNOSTIC	cpu/s390/globals_s390.hpp
ExpandLoadingBaseDecode	OpenJDK9		bool		s390		true	product	DIAGNOSTIC	cpu/s390/globals_s390.hpp
ExpandLoadingBaseEncode_NN	OpenJDK9		bool		s390		true	product	DIAGNOSTIC	cpu/s390/globals_s390.hpp
ExpandLoadingBaseEncode	OpenJDK9		bool		s390		true	product	DIAGNOSTIC	cpu/s390/globals_s390.hpp
ExpandSubTypeCheckAtParseTime	OpenJDK15		bool			c2	false	product	DIAGNOSTIC	share/opto/c2_globals.hpp
ExplicitGCInvokesConcurrent	OpenJDK6		bool			gc	false	product	A System.gc() request invokes a concurrent collection; (effective only when using concurrent collectors)	share/gc/shared/gc_globals.hpp
ExtendedDTraceProbes	OpenJDK6		bool			runtime	false	product	Enable performance-impacting dtrace probes	share/runtime/globals.hpp
ExtensiveErrorReports	OpenJDK11		bool			runtime	PRODUCT_ONLY(false) NOT_PRODUCT(true)	product	Error reports are more extensive.	share/runtime/globals.hpp
ExtraSharedClassListFile	OpenJDK8		ccstr			runtime	NULL	product	Extra classlist for building the CDS archive file	share/runtime/globals.hpp
FLOATPRESSURE	OpenJDK6		intx		aarch64		32	define_pd_global		cpu/aarch64/c2_globals_aarch64.hpp
FLOATPRESSURE	OpenJDK6		intx		arm		30	define_pd_global		cpu/arm/c2_globals_arm.hpp
FLOATPRESSURE	OpenJDK6		intx			c2		develop_pd	Number of float LRG's that constitute high register pressure	share/opto/c2_globals.hpp
FLOATPRESSURE	OpenJDK6		intx		ppc		28	define_pd_global		cpu/ppc/c2_globals_ppc.hpp
FLOATPRESSURE	OpenJDK6		intx		s390		15	define_pd_global		cpu/s390/c2_globals_s390.hpp
FLOATPRESSURE	OpenJDK6		intx		x86		6	define_pd_global		cpu/x86/c2_globals_x86.hpp
FLSVerifyDictionary	OpenJDK6		bool			runtime	false	develop	Do lots of (expensive) FLS dictionary verification	share/runtime/globals.hpp
FastAllocateSizeLimit	OpenJDK6		intx			runtime	128*K	develop	/* Note: This value is zero mod 1<<13 for a cheap sparc set. */Inline allocations larger than this in doublewords must go slow	share/runtime/globals.hpp
FilterSpuriousWakeups	OpenJDK6		bool			runtime	true	product	When true prevents OS-level spurious, or premature, wakeups from Object.wait (Ignored for Windows)	share/runtime/globals.hpp
FlightRecorderOptions	OpenJDK11		ccstr			runtime	NULL	product	Flight Recorder options	share/runtime/globals.hpp
FlightRecorder	OpenJDK11	Deprecated in JDK13	bool			runtime	false	product	(Deprecated) Enable Flight Recorder	share/runtime/globals.hpp
FoldStableValues	OpenJDK8		bool			runtime	true	product	DIAGNOSTIC	share/runtime/globals.hpp
ForceTimeHighResolution	OpenJDK6		bool			runtime	false	product	Using high time resolution (for Win32 only)	share/runtime/globals.hpp
ForceUnreachable	OpenJDK6		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
FreqCountInvocations	OpenJDK6		intx			c2	1 range(1, max_intx)	develop	Scaling factor for branch frequencies (deprecated)	share/opto/c2_globals.hpp
FreqInlineSize	OpenJDK6		intx		aarch64		325	define_pd_global		cpu/aarch64/c2_globals_aarch64.hpp
FreqInlineSize	OpenJDK6		intx		arm		175	define_pd_global		cpu/arm/c2_globals_arm.hpp
FreqInlineSize	OpenJDK6		intx			c2		product_pd	The maximum bytecode size of a frequent method to be inlined	share/opto/c2_globals.hpp
FreqInlineSize	OpenJDK6		intx		ppc		175	define_pd_global		cpu/ppc/c2_globals_ppc.hpp
FreqInlineSize	OpenJDK6		intx		s390		175	define_pd_global		cpu/s390/c2_globals_s390.hpp
FreqInlineSize	OpenJDK6		intx		x86		325	define_pd_global		cpu/x86/c2_globals_x86.hpp
FullGCALotDummies	OpenJDK6		intx			gc	32*K	notproduct	Dummy object allocated with +FullGCALot, forcing all objects to move	share/gc/shared/gc_globals.hpp
FullGCALotInterval	OpenJDK6		intx			gc	1	notproduct	Interval between which full gc will occur with +FullGCALot	share/gc/shared/gc_globals.hpp
FullGCALotStart	OpenJDK6		intx			gc	0	notproduct	For which invocation to start FullGCAlot	share/gc/shared/gc_globals.hpp
FullGCALot	OpenJDK6		bool			gc	false	develop	Force full gc at every Nth exit from the runtime system (N=FullGCALotInterval)	share/gc/shared/gc_globals.hpp
G1AdaptiveIHOPNumInitialSamples	OpenJDK9		size_t			gc	3 range(1, max_intx)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1ConcMarkStepDurationMillis	OpenJDK6		double			gc	10.0 range(1.0, DBL_MAX)	product	Target duration of individual concurrent marking steps in milliseconds.	share/gc/g1/g1_globals.hpp
G1ConcRSHotCardLimit	OpenJDK6		uintx			gc	4 range(0, max_jubyte)	product	The threshold that defines (>=) a hot card.	share/gc/g1/g1_globals.hpp
G1ConcRSLogCacheSize	OpenJDK6		size_t			gc	10 range(0, 27)	product	Log base 2 of the length of conc RS hot-card cache.	share/gc/g1/g1_globals.hpp
G1ConcRefinementGreenZone	OpenJDK6		size_t			gc	0 range(0, max_intx)	product	The number of update buffers that are left in the queue by the concurrent processing threads. Will be selected ergonomically by default.	share/gc/g1/g1_globals.hpp
G1ConcRefinementRedZone	OpenJDK6		size_t			gc	0 range(0, max_intx)	product	Maximum number of enqueued update buffers before mutator threads start processing new ones instead of enqueueing them. Will be selected ergonomically by default.	share/gc/g1/g1_globals.hpp
G1ConcRefinementServiceIntervalMillis	OpenJDK6		uintx			gc	300 range(0, max_jint)	product	The G1 service thread wakes up every specified number of milliseconds to do miscellaneous work.	share/gc/g1/g1_globals.hpp
G1ConcRefinementThreads	OpenJDK6		uint			gc	0 range(0, (max_jint-1)/wordSize)	product	The number of parallel rem set update threads. Will be set ergonomically by default.	share/gc/g1/g1_globals.hpp
G1ConcRefinementThresholdStep	OpenJDK6		size_t			gc	2 range(1, SIZE_MAX)	product	Each time the rset update queue increases by this amount activate the next refinement thread if available. The actual step size will be selected ergonomically by default, with this value used to determine a lower bound.	share/gc/g1/g1_globals.hpp
G1ConcRefinementYellowZone	OpenJDK6		size_t			gc	0 range(0, max_intx)	product	Number of enqueued update buffers that will trigger concurrent processing. Will be selected ergonomically by default.	share/gc/g1/g1_globals.hpp
G1ConfidencePercent	OpenJDK6		uintx			gc	50 range(0, 100)	product	Confidence level for MMU/pause predictions	share/gc/g1/g1_globals.hpp
G1DummyRegionsPerGC	OpenJDK6		uintx			gc	0	develop	The number of dummy regions G1 will allocate at the end of each evacuation pause in order to artificially fill up the heap and stress the marking implementation.	share/gc/g1/g1_globals.hpp
G1EagerReclaimHumongousObjectsWithStaleRefs	OpenJDK8		bool			gc	true	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1EagerReclaimHumongousObjects	OpenJDK8		bool			gc	true	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotCount	OpenJDK7		uintx			gc	1000	develop	Number of successful evacuations between evacuation failures occurring at object copying	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringConcMark	OpenJDK7		bool			gc	true	develop	Force use of evacuation failure handling during evacuation pauses when marking is in progress	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringConcurrentStart	OpenJDK16		bool			gc	true	develop	Force use of evacuation failure handling during concurrent start evacuation pauses	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringMixedGC	OpenJDK7		bool			gc	true	develop	Force use of evacuation failure handling during mixed evacuation pauses	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotDuringYoungGC	OpenJDK7		bool			gc	true	develop	Force use of evacuation failure handling during young evacuation pauses	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALotInterval	OpenJDK7		uintx			gc	5	develop	Total collections between forced triggering of evacuation failures	share/gc/g1/g1_globals.hpp
G1EvacuationFailureALot	OpenJDK7		bool			gc	false	notproduct	Force use of evacuation failure handling during certain evacuation pauses	share/gc/g1/g1_globals.hpp
G1ExitOnExpansionFailure	OpenJDK6		bool			gc	false	develop	Raise a fatal VM exit out of memory failure in the event that heap expansion fails due to running out of swap.	share/gc/g1/g1_globals.hpp
G1ExpandByPercentOfAvailable	OpenJDK6		intx			gc	20 range(0, 100)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1HeapRegionSize	OpenJDK6		size_t			gc	0 range(0, 32*M)	product	Size of the G1 regions.	share/gc/g1/g1_globals.hpp
G1HeapWastePercent	OpenJDK7		uintx			gc	5 range(0, 100)	product	Amount of space, expressed as a percentage of the heap size, that G1 is willing not to collect to avoid expensive GCs.	share/gc/g1/g1_globals.hpp
G1LastPLABAverageOccupancy	OpenJDK9		double			gc	50.0 range(0.001, 100.0)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1MaxNewSizePercent	OpenJDK7		uintx			gc	60 range(0, 100)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1MaxVerifyFailures	OpenJDK6		intx			gc	-1 range(-1, max_jint)	develop	The maximum number of verification failures to print. -1 means print all.	share/gc/g1/g1_globals.hpp
G1MixedGCCountTarget	OpenJDK7		uintx			gc	8 range(0, max_uintx)	product	The target number of mixed GCs after a marking cycle.	share/gc/g1/g1_globals.hpp
G1MixedGCLiveThresholdPercent	OpenJDK7		uintx			gc	85 range(0, 100)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1NewSizePercent	OpenJDK7		uintx			gc	5 range(0, 100)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1OldCSetRegionThresholdPercent	OpenJDK6		uintx			gc	10 range(0, 100)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1PeriodicGCInterval	OpenJDK12		uintx			gc	0	product	MANAGEABLE	share/gc/g1/g1_globals.hpp
G1PeriodicGCInvokesConcurrent	OpenJDK12		bool			gc	true	product	Determines the kind of periodic GC. Set to true to have G1 perform a concurrent GC as periodic GC, otherwise use a STW Full GC.	share/gc/g1/g1_globals.hpp
G1PeriodicGCSystemLoadThreshold	OpenJDK12		double			gc	0.0 range(0.0, (double)max_uintx)	product	MANAGEABLE	share/gc/g1/g1_globals.hpp
G1RSetRegionEntriesBase	OpenJDK6		intx			gc	256 range(1, max_jint/wordSize)	develop	Max number of regions in a fine-grain table per MB.	share/gc/g1/g1_globals.hpp
G1RSetRegionEntries	OpenJDK6		intx			gc	0 range(0, max_jint/wordSize)	product	Max number of regions for which we keep bitmaps.Will be set ergonomically by default	share/gc/g1/g1_globals.hpp
G1RSetSparseRegionEntriesBase	OpenJDK6		intx			gc	4 range(1, max_jint/wordSize)	develop	Max number of entries per region in a sparse table per MB.	share/gc/g1/g1_globals.hpp
G1RSetSparseRegionEntries	OpenJDK6		intx			gc	0 range(0, max_jint/wordSize)	product	Max number of entries per region in a sparse table.Will be set ergonomically by default.	share/gc/g1/g1_globals.hpp
G1RSetUpdatingPauseTimePercent	OpenJDK6		intx			gc	10 range(0, 100)	product	A target percentage of time that is allowed to be spend on process RS update buffers during the collection pause.	share/gc/g1/g1_globals.hpp
G1RebuildRemSetChunkSize	OpenJDK11		size_t			gc	256 * K range(4 * K, 32 * M)	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1RefProcDrainInterval	OpenJDK6		uint			gc	1000 range(1, INT_MAX)	product	The number of discovered reference objects to process before draining concurrent marking work queues.	share/gc/g1/g1_globals.hpp
G1ReservePercent	OpenJDK6		uintx			gc	10 range(0, 50)	product	It determines the minimum reserve we should have in the heap to minimize the probability of promotion failure.	share/gc/g1/g1_globals.hpp
G1SATBBufferEnqueueingThresholdPercent	OpenJDK6		uintx			gc	60 range(0, 100)	product	Before enqueueing them, each mutator thread tries to do some filtering on the SATB buffers it generates. If post-filtering the percentage of retained entries is over this threshold the buffer will be enqueued for processing. A value of 0 specifies that mutator threads should not do such filtering.	share/gc/g1/g1_globals.hpp
G1SATBBufferSize	OpenJDK6		size_t			gc	1*K range(1, max_uintx)	product	Number of entries in an SATB log buffer.	share/gc/g1/g1_globals.hpp
G1SATBProcessCompletedThreshold	OpenJDK6		intx			gc	20 range(0, max_jint)	develop	Number of completed buffers that triggers log processing.	share/gc/g1/g1_globals.hpp
G1SummarizeRSetStatsPeriod	OpenJDK6		intx			gc	0 range(0, max_intx)	product	DIAGNOSTIC	share/gc/g1/g1_globals.hpp
G1UpdateBufferSize	OpenJDK6		size_t			gc	256 range(1, NOT_LP64(32M) LP64_ONLY(1G))	product	Size of an update buffer	share/gc/g1/g1_globals.hpp
G1UseAdaptiveConcRefinement	OpenJDK6		bool			gc	true	product	Select green, yellow and red zones adaptively to meet the the pause requirements.	share/gc/g1/g1_globals.hpp
G1UseAdaptiveIHOP	OpenJDK9		bool			gc	true	product	Adaptively adjust the initiating heap occupancy from the initial value of InitiatingHeapOccupancyPercent. The policy attempts to start marking in time based on application behavior.	share/gc/g1/g1_globals.hpp
G1UseReferencePrecleaning	OpenJDK11		bool			gc	true	product	EXPERIMENTAL	share/gc/g1/g1_globals.hpp
G1VerifyBitmaps	OpenJDK8		bool			gc	false	develop	Verifies the consistency of the marking bitmaps	share/gc/g1/g1_globals.hpp
G1VerifyCTCleanup	OpenJDK6		bool			gc	false	develop	Verify card table cleanup.	share/gc/g1/g1_globals.hpp
G1VerifyHeapRegionCodeRoots	OpenJDK7		bool			gc	false	product	DIAGNOSTIC	share/gc/g1/g1_globals.hpp
G1VerifyRSetsDuringFullGC	OpenJDK7		bool			gc	false	product	DIAGNOSTIC	share/gc/g1/g1_globals.hpp
GCALotAtAllSafepoints	OpenJDK6		bool			gc	false	notproduct	Enforce ScavengeALot/GCALot at all potential safepoints	share/gc/shared/gc_globals.hpp
GCDrainStackTargetSize	OpenJDK6		uintx			gc	64 range(0, max_juint)	product	Number of entries we will try to leave on the stack during parallel gc	share/gc/shared/gc_globals.hpp
GCExpandToAllocateDelayMillis	OpenJDK6		uintx			gc	0	develop	Delay between expansion and allocation (in milliseconds)	share/gc/shared/gc_globals.hpp
GCHeapFreeLimit	OpenJDK6		uintx			gc	2 range(0, 100)	product	Minimum percentage of free space after a full GC before an OutOfMemoryError is thrown (used with GCTimeLimit)	share/gc/shared/gc_globals.hpp
GCLockerEdenExpansionPercent	OpenJDK6		uintx			gc	5 range(0, 100)	product	How much the GC can expand the eden by while the GC locker is active (as a percentage)	share/gc/shared/gc_globals.hpp
GCLockerRetryAllocationCount	OpenJDK8		uintx			gc	2 range(0, max_uintx)	product	DIAGNOSTIC	share/gc/shared/gc_globals.hpp
GCOverheadLimitThreshold	OpenJDK13		uintx			gc	5 range(1, max_uintx)	develop	Number of consecutive collections before gc time limit fires	share/gc/shared/gc_globals.hpp
GCParallelVerificationEnabled	OpenJDK6		bool			gc	true	product	DIAGNOSTIC	share/gc/shared/gc_globals.hpp
GCPauseIntervalMillis	OpenJDK6		uintx			gc	0	product	Time slice for MMU specification	share/gc/shared/gc_globals.hpp
GCTimeLimit	OpenJDK6		uintx			gc	98 range(0, 100)	product	Limit of the proportion of time spent in GC before an OutOfMemoryError is thrown (used with GCHeapFreeLimit)	share/gc/shared/gc_globals.hpp
GCTimeRatio	OpenJDK6		uintx			gc	99 range(0, max_juint)	product	Adaptive size policy application time to GC time ratio	share/gc/shared/gc_globals.hpp
GCWorkerDelayMillis	OpenJDK8		uintx			gc	0	develop	Delay in scheduling GC workers (in milliseconds)	share/gc/parallel/parallel_globals.hpp
GenerateArrayStoreCheck	OpenJDK6		bool			c1	true	develop	Generates code for array store checks	share/c1/c1_globals.hpp
GenerateRangeChecks	OpenJDK6		bool			runtime	true	develop	Generate range checks for array accesses	share/runtime/globals.hpp
GenerateSynchronizationCode	OpenJDK6		bool			runtime	true	develop	generate locking/unlocking code for synchronized methods and monitors	share/runtime/globals.hpp
GuaranteedSafepointInterval	OpenJDK9		intx			runtime	1000 range(0, max_jint)	product	DIAGNOSTIC	share/runtime/globals.hpp
HandshakeALot	OpenJDK13		bool			runtime	false	product	DIAGNOSTIC	share/runtime/globals.hpp
HandshakeTimeout	OpenJDK10		uint			runtime	0	product	DIAGNOSTIC	share/runtime/globals.hpp
HeapBaseMinAddress	OpenJDK6		size_t	aix	ppc		2*G	define_pd_global		os_cpu/aix_ppc/globals_aix_ppc.hpp
HeapBaseMinAddress	OpenJDK6		size_t	bsd	x86		2*G	define_pd_global		os_cpu/bsd_x86/globals_bsd_x86.hpp
HeapBaseMinAddress	OpenJDK6		size_t	bsd	zero		2*G	define_pd_global		os_cpu/bsd_zero/globals_bsd_zero.hpp
HeapBaseMinAddress	OpenJDK6		uintx	linux	aarch64		2*G	define_pd_global		os_cpu/linux_aarch64/globals_linux_aarch64.hpp
HeapBaseMinAddress	OpenJDK6		size_t	linux	arm		2*G	define_pd_global		os_cpu/linux_arm/globals_linux_arm.hpp
HeapBaseMinAddress	OpenJDK6		size_t	linux	ppc		2*G	define_pd_global		os_cpu/linux_ppc/globals_linux_ppc.hpp
HeapBaseMinAddress	OpenJDK6		size_t	linux	s390		2*G	define_pd_global		os_cpu/linux_s390/globals_linux_s390.hpp
HeapBaseMinAddress	OpenJDK6		size_t	linux	x86		2*G	define_pd_global		os_cpu/linux_x86/globals_linux_x86.hpp
HeapBaseMinAddress	OpenJDK6		size_t	linux	zero		2*G	define_pd_global		os_cpu/linux_zero/globals_linux_zero.hpp
HeapBaseMinAddress	OpenJDK6		size_t			gc		product_pd	OS specific low limit for heap base address	share/gc/shared/gc_globals.hpp
HeapBaseMinAddress	OpenJDK6		uintx	windows	aarch64		2*G	define_pd_global		os_cpu/windows_aarch64/globals_windows_aarch64.hpp
HeapBaseMinAddress	OpenJDK6		size_t	windows	x86		2*G	define_pd_global		os_cpu/windows_x86/globals_windows_x86.hpp
HeapDumpAfterFullGC	OpenJDK6		bool			runtime	false	product	MANAGEABLE	share/runtime/globals.hpp
HeapDumpBeforeFullGC	OpenJDK6		bool			runtime	false	product	MANAGEABLE	share/runtime/globals.hpp
HeapDumpOnOutOfMemoryError	OpenJDK6		bool			runtime	false	product	MANAGEABLE	share/runtime/globals.hpp
HeapDumpPath	OpenJDK6		ccstr			runtime	NULL	product	MANAGEABLE	share/runtime/globals.hpp
HeapFirstMaximumCompactionCount	OpenJDK6		uintx			gc	3 range(0, max_uintx)	product	The collection count for the first maximum compaction	share/gc/parallel/parallel_globals.hpp
HeapMaximumCompactionInterval	OpenJDK6		uintx			gc	20 range(0, max_uintx)	product	How often should we maximally compact the heap (not allowing any dead space)	share/gc/parallel/parallel_globals.hpp
HeapSearchSteps	OpenJDK9		uintx			runtime	3 PPC64_ONLY(+17) range(1, max_uintx)	product	Heap allocation steps through preferred address regions to find where it can allocate the heap. Number of steps to take per region.	share/runtime/globals.hpp
HeapSizePerGCThread	OpenJDK6		size_t			gc	ScaleForWordSize(32*M)	product	Size of heap (bytes) per GC thread used in calculating the number of GC threads	share/gc/shared/gc_globals.hpp
HotCallCountThreshold	OpenJDK6		intx			c2	999999 range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))	develop	large numbers of calls (per method invocation) force hotness	share/opto/c2_globals.hpp
HotCallProfitThreshold	OpenJDK6		intx			c2	999999 range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))	develop	highly profitable inlining opportunities force hotness	share/opto/c2_globals.hpp
HotCallTrivialSize	OpenJDK6		intx			c2	-1 range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))	develop	trivial methods (no larger than this) force calls to be hot	share/opto/c2_globals.hpp
HotCallTrivialWork	OpenJDK6		intx			c2	-1 range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))	develop	trivial execution time (no larger than this) forces hotness	share/opto/c2_globals.hpp
HotMethodDetectionLimit	OpenJDK9		intx			runtime	100000 range(1, max_jint)	product	DIAGNOSTIC	share/runtime/globals.hpp
HugeMethodLimit	OpenJDK6		intx			compiler	8000	develop	Don't compile methods larger than this if +DontCompileHugeMethods	share/compiler/compiler_globals.hpp
ICMissHistogram	OpenJDK6		bool			runtime	false	notproduct	Produce histogram of IC misses	share/runtime/globals.hpp
IEEEPrecision	OpenJDK6		bool		x86		true	develop	Enables IEEE precision (for INTEL only)	cpu/x86/globals_x86.hpp
INTPRESSURE	OpenJDK6		intx		aarch64		24	define_pd_global		cpu/aarch64/c2_globals_aarch64.hpp
INTPRESSURE	OpenJDK6		intx		arm		12	define_pd_global		cpu/arm/c2_globals_arm.hpp
INTPRESSURE	OpenJDK6		intx			c2		develop_pd	Number of integer LRG's that constitute high register pressure	share/opto/c2_globals.hpp
INTPRESSURE	OpenJDK6		intx		ppc		26	define_pd_global		cpu/ppc/c2_globals_ppc.hpp
INTPRESSURE	OpenJDK6		intx		s390		10	define_pd_global	// Medium size register set, 6 special purpose regs, 3 SOE regs.	cpu/s390/c2_globals_s390.hpp
INTPRESSURE	OpenJDK6		intx		x86		6	define_pd_global		cpu/x86/c2_globals_x86.hpp
IdealizeClearArrayNode	OpenJDK9		bool		aarch64		true	define_pd_global		cpu/aarch64/c2_globals_aarch64.hpp
IdealizeClearArrayNode	OpenJDK9		bool		arm		true	define_pd_global		cpu/arm/c2_globals_arm.hpp
IdealizeClearArrayNode	OpenJDK9		bool			c2		product_pd	DIAGNOSTIC	share/opto/c2_globals.hpp
IdealizeClearArrayNode	OpenJDK9		bool		ppc		true	define_pd_global		cpu/ppc/c2_globals_ppc.hpp
IdealizeClearArrayNode	OpenJDK9		bool		s390		false	define_pd_global		cpu/s390/c2_globals_s390.hpp
IdealizeClearArrayNode	OpenJDK9		bool		x86		true	define_pd_global		cpu/x86/c2_globals_x86.hpp
IdealizedNumerics	OpenJDK6		bool			c2	false	develop	Check performance difference allowing FP associativity and commutativity...	share/opto/c2_globals.hpp
IgnoreEmptyClassPaths	OpenJDK8		bool			runtime	false	product	Ignore empty path elements in -classpath	share/runtime/globals.hpp
IgnoreUnrecognizedVMOptions	OpenJDK6		bool			runtime	false	product	Ignore unrecognized VM options	share/runtime/globals.hpp
ImplicitDiv0Checks	OpenJDK6		bool			c1	true	develop	Use implicit division by zero checks	share/c1/c1_globals.hpp
ImplicitNullCheckThreshold	OpenJDK6		intx			c2	3 range(0, max_jint)	develop	Don't do implicit null checks if NPE's in a method exceeds limit	share/opto/c2_globals.hpp
ImplicitNullChecks	OpenJDK6		bool		aarch64		true	define_pd_global	// Generate code for implicit null checks	cpu/aarch64/globals_aarch64.hpp
ImplicitNullChecks	OpenJDK6		bool		arm		true	define_pd_global	// Generate code for implicit null checks	cpu/arm/globals_arm.hpp
ImplicitNullChecks	OpenJDK6		bool			runtime		product_pd	DIAGNOSTIC	share/runtime/globals.hpp
ImplicitNullChecks	OpenJDK6		bool		ppc		true	define_pd_global	// Generate code for implicit null checks.	cpu/ppc/globals_ppc.hpp
ImplicitNullChecks	OpenJDK6		bool		s390		true	define_pd_global	// Generate code for implicit null checks.	cpu/s390/globals_s390.hpp
ImplicitNullChecks	OpenJDK6		bool		x86		true	define_pd_global	// Generate code for implicit null checks	cpu/x86/globals_x86.hpp
ImplicitNullChecks	OpenJDK6		bool		zero		true	define_pd_global		cpu/zero/globals_zero.hpp
IncreaseFirstTierCompileThresholdAt	OpenJDK8		uintx			compiler	50 range(0, 99)	product	Increase the compile threshold for C1 compilation if the code cache is filled by the specified percentage	share/compiler/compiler_globals.hpp
IncrementalInlineForceCleanup	OpenJDK16		bool			c2	false	product	DIAGNOSTIC	share/opto/c2_globals.hpp
IncrementalInlineMH	OpenJDK16		bool			c2	true	product	DIAGNOSTIC	share/opto/c2_globals.hpp
IncrementalInlineVirtual	OpenJDK16		bool			c2	true	product	DIAGNOSTIC	share/opto/c2_globals.hpp
IncrementalInline	OpenJDK7		bool			c2	true	product	do post parse inlining	share/opto/c2_globals.hpp
IndexSetWatch	OpenJDK6		intx			c2	0 range(-1, 0)	notproduct	Trace all operations on this IndexSet (-1 means all, 0 none)	share/opto/c2_globals.hpp
InitArrayShortSize	OpenJDK9		intx		aarch64		BytesPerLong	define_pd_global		cpu/aarch64/globals_aarch64.hpp

Name

Since

Deprecated

Type

CPU

Component

Default

Availability

Description

Defined in

Since

Deprecated

Type

CPU

Component

Availability

AOTLibrary

OpenJDK9

ccstrlist

runtime

NULL

product

EXPERIMENTAL

share/runtime/globals.hpp

AVX3Threshold

OpenJDK11

int

x86

4096
range(0, max_jint)

product

DIAGNOSTIC

cpu/x86/globals_x86.hpp

AbortVMOnCompilationFailure

OpenJDK11

bool

compiler

false

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

AbortVMOnExceptionMessage

OpenJDK6

ccstr

runtime

NULL

product

DIAGNOSTIC

share/runtime/globals.hpp

AbortVMOnException

OpenJDK6

ccstr

runtime

NULL

product

DIAGNOSTIC

share/runtime/globals.hpp

AbortVMOnSafepointTimeout

OpenJDK11

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

AbortVMOnVMOperationTimeoutDelay

OpenJDK11

intx

runtime

1000
range(0, max_intx)

product

DIAGNOSTIC

share/runtime/globals.hpp

AbortVMOnVMOperationTimeout

OpenJDK11

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

ActiveProcessorCount

OpenJDK10

int

-1

product

Specify the CPU count the VM should use and report as active

share/gc/shared/gc_globals.hpp

AdaptiveSizeDecrementScaleFactor

OpenJDK6

uintx

4
range(1, max_uintx)

product

Adaptive size scale down factor for shrinking

share/gc/shared/gc_globals.hpp

AdaptiveSizeMajorGCDecayTimeScale

OpenJDK6

uintx

10
range(0, max_uintx)

product

Time scale over which major costs decay

share/gc/shared/gc_globals.hpp

AdaptiveSizePolicyCollectionCostMargin

OpenJDK6

uintx

50
range(0, 100)

product

If collection costs are within margin, reduce both by full delta

share/gc/shared/gc_globals.hpp

AdaptiveSizePolicyInitializingSteps

OpenJDK6

uintx

20
range(0, max_uintx)

product

Number of steps where heuristics is used before data is used

share/gc/shared/gc_globals.hpp

AdaptiveSizePolicyOutputInterval

OpenJDK6

uintx

0
range(0, max_uintx)

product

Collection interval for printing information; zero means never

share/gc/shared/gc_globals.hpp

AdaptiveSizePolicyReadyThreshold

OpenJDK6

uintx

develop

Number of collections before the adaptive sizing is started

share/gc/shared/gc_globals.hpp

AdaptiveSizePolicyWeight

OpenJDK6

uintx

10
range(0, 100)

product

Weight given to exponential resizing, between 0 and 100

share/gc/shared/gc_globals.hpp

AdaptiveSizeThroughPutPolicy

OpenJDK6

uintx

0
range(0, 1)

product

Policy for changing generation size for throughput goals

share/gc/shared/gc_globals.hpp

AdaptiveTimeWeight

OpenJDK6

uintx

25
range(0, 100)

product

Weight given to time in adaptive policy, between 0 and 100

share/gc/shared/gc_globals.hpp

AdjustStackSizeForTLS

OpenJDK14

bool

linux

false

product

Increase the thread stack size to include space for glibc static thread-local storage (TLS) if true

os/linux/globals_linux.hpp

AggressiveHeap

OpenJDK10

bool

false

product

Optimize heap options for long-running memory intensive apps

share/gc/shared/gc_globals.hpp

AggressiveUnboxing

OpenJDK8

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

AliasLevel

OpenJDK6

intx

3
range(0, 3)

product

0 for no aliasing, 1 for oop/field/static/array split,
2 for class split, 3 for unique instances

share/opto/c2_globals.hpp

AlignVector

OpenJDK7

bool

true

product

Perform vector store/load alignment in loop

share/opto/c2_globals.hpp

AllocateHeapAt

OpenJDK10

ccstr

runtime

NULL

product

Path to the directory where a temporary file will be created to use as the backing store for Java Heap.

share/runtime/globals.hpp

AllocateInstancePrefetchLines

OpenJDK6

intx

runtime

1
range(1, 64)

product

Number of lines to prefetch ahead of instance allocation pointer

share/runtime/globals.hpp

AllocatePrefetchDistance

OpenJDK6

intx

runtime

-1

product

Distance to prefetch ahead of allocation pointer. -1: use system-specific value (automatically determined

share/runtime/globals.hpp

AllocatePrefetchInstr

OpenJDK6

intx

runtime

product

Select instruction to prefetch ahead of allocation pointer

share/runtime/globals.hpp

AllocatePrefetchLines

OpenJDK6

intx

runtime

3
range(1, 64)

product

Number of lines to prefetch ahead of array allocation pointer

share/runtime/globals.hpp

AllocatePrefetchStepSize

OpenJDK6

intx

runtime

16
range(1, 512)

product

Step size in bytes of sequential prefetch instructions

share/runtime/globals.hpp

AllocatePrefetchStyle

OpenJDK6

intx

runtime

1
range(0, 3)

product

0 = no prefetch,
1 = generate prefetch instructions for each allocation,
2 = use TLAB watermark to gate allocation prefetch,
3 = generate one prefetch instruction per cache line

share/runtime/globals.hpp

AllowArchivingWithJavaAgent

OpenJDK12

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

AllowExtshm

OpenJDK9

bool

aix

false

product

Allow VM to run with EXTSHM=ON.

os/aix/globals_aix.hpp

AllowParallelDefineClass

OpenJDK6

bool

runtime

false

product

Allow parallel defineClass requests for class loaders registering as parallel capable

share/runtime/globals.hpp

AllowRedefinitionToAddDeleteMethods

OpenJDK13

Deprecated in JDK13

bool

runtime

false

product

(Deprecated) Allow redefinition to add and delete private static or final methods for compatibility with old releases

share/runtime/globals.hpp

AllowUserSignalHandlers

OpenJDK6

bool

runtime

false

product

Application will install primary signal handlers for the JVM (Unix only)

share/runtime/globals.hpp

AllowVectorizeOnDemand

OpenJDK9

bool

true

product

Globally supress vectorization set in VectorizeMethod

share/opto/c2_globals.hpp

AlwaysActAsServerClassMachine

OpenJDK6

bool

false

product

Always act like a server-class machine

share/gc/shared/gc_globals.hpp

AlwaysAtomicAccesses

OpenJDK9

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

AlwaysCompileLoopMethods

OpenJDK6

bool

runtime

false

product

When using recompilation, never interpret methods containing loops

share/runtime/globals.hpp

AlwaysIncrementalInline

OpenJDK7

bool

false

develop

do all inlining incrementally

share/opto/c2_globals.hpp

AlwaysLockClassLoader

OpenJDK6

Deprecated in JDK17
Obsoleted in JDK18
Expired in JDK19

bool

runtime

false

product

(Deprecated) Require the VM to acquire the class loader lock before calling loadClass() even for class loaders registering as parallel capable

share/runtime/globals.hpp

AlwaysPreTouch

OpenJDK6

bool

false

product

Force all freshly committed pages to be pre-touched

share/gc/shared/gc_globals.hpp

AlwaysRestoreFPU

OpenJDK6

bool

runtime

false

product

Restore the FPU control word after every JNI call (expensive)

share/runtime/globals.hpp

AlwaysSafeConstructors

OpenJDK9

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

AlwaysTenure

OpenJDK6

bool

false

product

Always tenure objects in eden (ParallelGC only)

share/gc/shared/gc_globals.hpp

ArchiveClassesAtExit

OpenJDK13

ccstr

runtime

NULL

product

The path and name of the dynamic archive file

share/runtime/globals.hpp

ArchiveRelocationMode

OpenJDK14

intx

runtime

0
range(0, 2)

product

DIAGNOSTIC

share/runtime/globals.hpp

ArrayAllocatorMallocLimit

OpenJDK7

size_t

runtime

(size_t)-1

product

EXPERIMENTAL

share/runtime/globals.hpp

ArrayCopyLoadStoreMaxElem

OpenJDK9

intx

8
range(0, max_intx)

product

Maximum number of arraycopy elements inlined as a sequence ofloads/stores

share/opto/c2_globals.hpp

ArrayCopyPartialInlineSize

OpenJDK16

intx

-1
range(-1, 64)

product

DIAGNOSTIC

share/opto/c2_globals.hpp

AssertOnSuspendWaitFailure

OpenJDK6

bool

runtime

false

product

Assert/Guarantee on external suspend wait failure

share/runtime/globals.hpp

AssertRangeCheckElimination

OpenJDK8

bool

false

develop

Assert Range Check Elimination

share/c1/c1_globals.hpp

AsyncDeflationInterval

OpenJDK15

intx

runtime

250
range(0, max_jint)

product

DIAGNOSTIC

share/runtime/globals.hpp

AutoBoxCacheMax

OpenJDK6

intx

128
range(0, max_jint)

product

Sets max value cached by the java.lang.Integer autobox cache

share/opto/c2_globals.hpp

AvgMonitorsPerThreadEstimate

OpenJDK16

size_t

runtime

1024
range(0, max_uintx)

product

DIAGNOSTIC

share/runtime/globals.hpp

AvoidUnalignedAccesses

OpenJDK9

bool

aarch64

false

product

Avoid generating unaligned memory accesses

cpu/aarch64/globals_aarch64.hpp

BCEATraceLevel

OpenJDK6

intx

compiler

0
range(0, 3)

product

How much tracing to do of bytecode escape analysis estimates (0-3)

share/compiler/compiler_globals.hpp

BackgroundCompilation

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

BackgroundCompilation

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

BackgroundCompilation

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

BackgroundCompilation

OpenJDK6

bool

runtime

product_pd

A thread requesting compilation is not blocked during compilation

share/runtime/globals.hpp

BackgroundCompilation

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

BackgroundCompilation

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

BackgroundCompilation

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

BailoutAfterHIR

OpenJDK6

bool

false

develop

bailout of compilation after building of HIR

share/c1/c1_globals.hpp

BailoutAfterLIR

OpenJDK6

bool

false

develop

bailout of compilation after building of LIR

share/c1/c1_globals.hpp

BailoutOnExceptionHandlers

OpenJDK6

bool

false

develop

bailout of compilation for methods with exception handlers

share/c1/c1_globals.hpp

BailoutToInterpreterForThrows

OpenJDK6

bool

false

develop

Compiled methods which throws/catches exceptions will be deopt and intp.

share/opto/c2_globals.hpp

BaseFootPrintEstimate

OpenJDK6

size_t

256*M
range(0, max_uintx)

product

Estimate of footprint other than Java Heap

share/gc/shared/gc_globals.hpp

BciProfileWidth

OpenJDK6

intx

runtime

develop

Number of return bci's to record in ret profile

share/runtime/globals.hpp

BiasedLockingBulkRebiasThreshold

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

intx

runtime

20
range(0, max_intx)

product

(Deprecated) Threshold of number of revocations per type to try to rebias all objects in the heap of that type

share/runtime/globals.hpp

BiasedLockingBulkRevokeThreshold

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

intx

runtime

40
range(0, max_intx)

product

(Deprecated) Threshold of number of revocations per type to permanently revoke biases of all objects in the heap of that type

share/runtime/globals.hpp

BiasedLockingDecayTime

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

intx

runtime

25000
range(500, max_intx)

product

(Deprecated) Decay time (in milliseconds) to re-enable bulk rebiasing of a type after previous bulk rebias

share/runtime/globals.hpp

BiasedLockingStartupDelay

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

intx

runtime

0
range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran)))

product

(Deprecated) Number of milliseconds to wait before enabling biased locking

share/runtime/globals.hpp

BinarySwitchThreshold

OpenJDK6

intx

runtime

develop

Minimal number of lookupswitch entries for rewriting to binary switch

share/runtime/globals.hpp

BlockLayoutByFrequency

OpenJDK6

bool

true

product

Use edge frequencies to drive block ordering

share/opto/c2_globals.hpp

BlockLayoutMinDiamondPercentage

OpenJDK6

intx

20
range(0, 100)

product

Miniumum %% of a successor (predecessor) for which block layout a will allow a fork (join) in a single chain

share/opto/c2_globals.hpp

BlockLayoutRotateLoops

OpenJDK6

bool

true

product

Allow back branches to be fall throughs in the block layout

share/opto/c2_globals.hpp

BlockZeroingLowLimit

OpenJDK6

intx

aarch64

256
range(1, max_jint)

product

Minimum size in bytes when block zeroing will be used

cpu/aarch64/globals_aarch64.hpp

BootstrapJVMCI

OpenJDK9

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

BreakAtNode

OpenJDK6

intx

notproduct

Break at construction of this Node (either _idx or _debug_idx)

share/opto/c2_globals.hpp

BytecodeVerificationLocal

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

BytecodeVerificationRemote

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

C1Breakpoint

OpenJDK6

bool

false

develop

Sets a breakpoint at entry of each compiled method

share/c1/c1_globals.hpp

C1InlineStackLimit

OpenJDK15

intx

10
range(0, max_jint)

product

inlining only allowed for methods which don't exceed this number of expression stack and local slots

share/c1/c1_globals.hpp

C1MaxInlineLevel

OpenJDK15

intx

9
range(0, max_jint)

product

The maximum number of nested calls that are inlined by C1

share/c1/c1_globals.hpp

C1MaxInlineSize

OpenJDK15

intx

35
range(0, max_jint)

product

The maximum bytecode size of a method to be inlined by C1

share/c1/c1_globals.hpp

C1MaxRecursiveInlineLevel

OpenJDK15

intx

1
range(0, max_jint)

product

maximum number of nested recursive calls that are inlined by C1

share/c1/c1_globals.hpp

C1MaxTrivialSize

OpenJDK15

intx

6
range(0, max_jint)

product

The maximum bytecode size of a trivial method to be inlined by C1

share/c1/c1_globals.hpp

C1OptimizeVirtualCallProfiling

OpenJDK6

bool

true

product

Use CHA and exact type results at call sites when updating MDOs

share/c1/c1_globals.hpp

C1ProfileBranches

OpenJDK6

bool

true

product

Profile branches when generating code for updating MDOs

share/c1/c1_globals.hpp

C1ProfileCalls

OpenJDK6

bool

true

product

Profile calls when generating code for updating MDOs

share/c1/c1_globals.hpp

C1ProfileCheckcasts

OpenJDK6

bool

true

product

Profile checkcasts when generating code for updating MDOs

share/c1/c1_globals.hpp

C1ProfileInlinedCalls

OpenJDK6

bool

true

product

Profile inlined calls when generating code for updating MDOs

share/c1/c1_globals.hpp

C1ProfileVirtualCalls

OpenJDK6

bool

true

product

Profile virtual calls when generating code for updating MDOs

share/c1/c1_globals.hpp

C1UpdateMethodData

OpenJDK6

bool

trueInTiered

product

Update MethodData*s in Tier1-generated code

share/c1/c1_globals.hpp

CIBreakAtOSR

OpenJDK6

intx

compiler

-1

develop

The id of osr compilation to break at

share/compiler/compiler_globals.hpp

CIBreakAt

OpenJDK6

intx

compiler

-1

develop

The id of compilation to break at

share/compiler/compiler_globals.hpp

CICompileNatives

OpenJDK6

bool

compiler

true

develop

compile native methods if supported by the compiler

share/compiler/compiler_globals.hpp

CICompileOSR

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

CICompileOSR

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

CICompileOSR

OpenJDK6

bool

compiler

develop_pd

compile on stack replacement methods if supported by the compiler

share/compiler/compiler_globals.hpp

CICompileOSR

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

CICompileOSR

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

CICompileOSR

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

CICompilerCountPerCPU

OpenJDK6

bool

compiler

false

product

1 compiler thread for log(N CPUs)

share/compiler/compiler_globals.hpp

CICompilerCount

OpenJDK6

intx

runtime

CI_COMPILER_COUNT
range(0, max_jint)

product

Number of compiler threads to run

share/runtime/globals.hpp

CICountOSR

OpenJDK6

bool

compiler

false

develop

use a separate counter when assigning ids to osr compilations

share/compiler/compiler_globals.hpp

CICrashAt

OpenJDK8

intx

compiler

-1

notproduct

id of compilation to trigger assert in compiler thread for the purpose of testing, e.g. generation of replay data

share/compiler/compiler_globals.hpp

CIObjectFactoryVerify

OpenJDK6

bool

compiler

false

notproduct

enable potentially expensive verification in ciObjectFactory

share/compiler/compiler_globals.hpp

CIPrintCompileQueue

OpenJDK6

bool

compiler

false

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

CIPrintCompilerName

OpenJDK6

bool

compiler

false

develop

when CIPrint is active, print the name of the active compiler

share/compiler/compiler_globals.hpp

CIPrintMethodCodes

OpenJDK6

bool

compiler

false

develop

print method bytecodes of the compiled code

share/compiler/compiler_globals.hpp

CIPrintRequests

OpenJDK6

bool

compiler

false

develop

display every request for compilation

share/compiler/compiler_globals.hpp

CIPrintTypeFlow

OpenJDK6

bool

compiler

false

develop

print the results of ciTypeFlow analysis

share/compiler/compiler_globals.hpp

CIStartOSR

OpenJDK6

intx

compiler

develop

The id of the first osr compilation to permit (CICountOSR must be on)

share/compiler/compiler_globals.hpp

CIStart

OpenJDK6

intx

compiler

develop

The id of the first compilation to permit

share/compiler/compiler_globals.hpp

CIStopOSR

OpenJDK6

intx

compiler

max_jint

develop

The id of the last osr compilation to permit (CICountOSR must be on)

share/compiler/compiler_globals.hpp

CIStop

OpenJDK6

intx

compiler

max_jint

develop

The id of the last compilation to permit

share/compiler/compiler_globals.hpp

CITimeEach

OpenJDK6

bool

compiler

false

develop

display timing information after each successful compilation

share/compiler/compiler_globals.hpp

CITimeVerbose

OpenJDK9

bool

compiler

false

develop

be more verbose in compilation timings

share/compiler/compiler_globals.hpp

CITime

OpenJDK6

bool

compiler

false

product

collect timing information for compilation

share/compiler/compiler_globals.hpp

CITraceTypeFlow

OpenJDK6

bool

compiler

false

develop

detailed per-bytecode tracing of ciTypeFlow analysis

share/compiler/compiler_globals.hpp

CSEArrayLength

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

CSEArrayLength

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c1_globals_arm.hpp

CSEArrayLength

OpenJDK6

bool

develop_pd

Create separate nodes for length in array accesses

share/c1/c1_globals.hpp

CSEArrayLength

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

CSEArrayLength

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c1_globals_s390.hpp

CSEArrayLength

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c1_globals_x86.hpp

CalculateClassFingerprint

OpenJDK10

bool

runtime

false

product

Calculate class fingerprint

share/runtime/globals.hpp

CanonicalizeNodes

OpenJDK6

bool

true

develop

Canonicalize graph nodes

share/c1/c1_globals.hpp

CheckCompressedOops

OpenJDK6

bool

runtime

true

notproduct

Generate checks in encoding/decoding code in debug VM

share/runtime/globals.hpp

CheckIntrinsics

OpenJDK9

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

CheckJNICalls

OpenJDK6

bool

runtime

false

product

Verify all arguments to JNI calls

share/runtime/globals.hpp

CheckMemoryInitialization

OpenJDK6

bool

runtime

false

notproduct

Check memory initialization

share/runtime/globals.hpp

CheckUnhandledOops

OpenJDK6

bool

runtime

false

develop

Check for unhandled oops in VM code

share/runtime/globals.hpp

CheckZapUnusedHeapArea

OpenJDK6

bool

runtime

false

develop

Check zapping of unused heap space

share/runtime/globals.hpp

ClassUnloadingWithConcurrentMark

OpenJDK8

bool

runtime

true

product

Do unloading of classes with a concurrent marking cycle

share/runtime/globals.hpp

ClassUnloading

OpenJDK6

bool

runtime

true

product

Do unloading of classes

share/runtime/globals.hpp

ClipInlining

OpenJDK6

bool

runtime

true

product

Clip inlining if aggregate method exceeds DesiredMethodLimit

share/runtime/globals.hpp

CodeCacheExpansionSize

OpenJDK6

intx

aarch64

32*K

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

CodeCacheExpansionSize

OpenJDK6

size_t

arm

32*K

define_pd_global

cpu/arm/c2_globals_arm.hpp

CodeCacheExpansionSize

OpenJDK6

uintx

compiler

32*K

define_pd_global

share/compiler/compiler_globals_pd.hpp

CodeCacheExpansionSize

OpenJDK6

uintx

runtime

product_pd

Code cache expansion size (in bytes)

share/runtime/globals.hpp

CodeCacheExpansionSize

OpenJDK6

uintx

ppc

32*K

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

CodeCacheExpansionSize

OpenJDK6

uintx

s390

64*K

define_pd_global

cpu/s390/c2_globals_s390.hpp

CodeCacheExpansionSize

OpenJDK6

uintx

x86

32*K

define_pd_global

cpu/x86/c1_globals_x86.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

aarch64

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

arm

define_pd_global

cpu/arm/c2_globals_arm.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

compiler

define_pd_global

share/compiler/compiler_globals_pd.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

runtime

product_pd

DIAGNOSTIC

share/runtime/globals.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

ppc

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

CodeCacheMinBlockLength

OpenJDK6

uintx

x86

define_pd_global

cpu/x86/c1_globals_x86.hpp

CodeCacheMinimumUseSpace

OpenJDK8

uintx

aarch64

400*K

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

CodeCacheMinimumUseSpace

OpenJDK8

size_t

arm

400*K

define_pd_global

cpu/arm/c2_globals_arm.hpp

CodeCacheMinimumUseSpace

OpenJDK8

uintx

compiler

200*K

define_pd_global

share/compiler/compiler_globals_pd.hpp

CodeCacheMinimumUseSpace

OpenJDK8

uintx

runtime

develop_pd

Minimum code cache size (in bytes) required to start VM.

share/runtime/globals.hpp

CodeCacheMinimumUseSpace

OpenJDK8

uintx

ppc

400*K

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

CodeCacheMinimumUseSpace

OpenJDK8

uintx

s390

400*K

define_pd_global

cpu/s390/c2_globals_s390.hpp

CodeCacheMinimumUseSpace

OpenJDK8

uintx

x86

400*K

define_pd_global

cpu/x86/c1_globals_x86.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

aarch64

64 TIERED_ONLY(+64)

define_pd_global

// Tiered compilation has large code-entry alignment.

cpu/aarch64/globals_aarch64.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

arm

64 TIERED_ONLY(+64)

define_pd_global

// Tiered compilation has large code-entry alignment.

cpu/arm/globals_arm.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

runtime

develop_pd

Code cache segment size (in bytes) - smallest unit of allocation

share/runtime/globals.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

ppc

128

define_pd_global

cpu/ppc/globals_ppc.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

s390

256

define_pd_global

cpu/s390/globals_s390.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

x86

64 TIERED_ONLY(+64)

define_pd_global

// Tiered compilation has large code-entry alignment.

cpu/x86/globals_x86.hpp

CodeCacheSegmentSize

OpenJDK6

uintx

zero

64 TIERED_ONLY(+64)

define_pd_global

// Tiered compilation has large code-entry alignment.

cpu/zero/globals_zero.hpp

CodeEntryAlignment

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/globals_aarch64.hpp

CodeEntryAlignment

OpenJDK6

intx

arm

define_pd_global

cpu/arm/globals_arm.hpp

CodeEntryAlignment

OpenJDK6

intx

runtime

develop_pd

Code entry alignment for generated code (in bytes)

share/runtime/globals.hpp

CodeEntryAlignment

OpenJDK6

intx

ppc

128

define_pd_global

cpu/ppc/globals_ppc.hpp

CodeEntryAlignment

OpenJDK6

intx

s390

define_pd_global

cpu/s390/globals_s390.hpp

CodeEntryAlignment

OpenJDK6

intx

x86

define_pd_global

cpu/x86/globals_x86.hpp

CodeEntryAlignment

OpenJDK6

intx

zero

define_pd_global

cpu/zero/globals_zero.hpp

CollectIndexSetStatistics

OpenJDK6

bool

runtime

false

notproduct

Collect information about IndexSets

share/runtime/globals.hpp

CommentedAssembly

OpenJDK6

bool

trueInDebug

develop

Show extra info in PrintNMethods output

share/c1/c1_globals.hpp

CompactStrings

OpenJDK9

bool

aarch64

true

define_pd_global

cpu/aarch64/globals_aarch64.hpp

CompactStrings

OpenJDK9

bool

arm

false

define_pd_global

cpu/arm/globals_arm.hpp

CompactStrings

OpenJDK9

bool

runtime

product_pd

Enable Strings to use single byte chars in backing store

share/runtime/globals.hpp

CompactStrings

OpenJDK9

bool

ppc

true

define_pd_global

cpu/ppc/globals_ppc.hpp

CompactStrings

OpenJDK9

bool

s390

true

define_pd_global

cpu/s390/globals_s390.hpp

CompactStrings

OpenJDK9

bool

x86

true

define_pd_global

cpu/x86/globals_x86.hpp

CompactStrings

OpenJDK9

bool

zero

false

define_pd_global

cpu/zero/globals_zero.hpp

CompilationMode

OpenJDK14

ccstr

compiler

default

product

Compilation modes: default: normal tiered compilation; quick-only: C1-only mode; high-only: C2/JVMCI-only mode; high-only-quick-internal: C2/JVMCI-only mode, with JVMCI compiler compiled with C1.

share/compiler/compiler_globals.hpp

CompileCommandFile

OpenJDK6

ccstr

compiler

NULL

product

Read compiler commands from this file [.hotspot_compiler]

share/compiler/compiler_globals.hpp

CompileCommand

OpenJDK6

ccstrlist

compiler

Prepend to .hotspot_compiler; e.g. log,java/lang/String.

product

share/compiler/compiler_globals.hpp

CompileOnly

OpenJDK6

ccstrlist

compiler

List of methods (pkg/class.name) to restrict compilation to

product

share/compiler/compiler_globals.hpp

CompileThresholdScaling

OpenJDK9

double

compiler

1.0
range(0.0, DBL_MAX)

product

Factor to control when first compilation happens (both with and without tiered compilation): values greater than 1.0 delay counter overflow, values between 0 and 1.0 rush counter overflow, value of 1.0 leaves compilation thresholds unchanged value of 0.0 is equivalent to -Xint. Flag can be set as per-method option. If a value is specified for a method, compilation thresholds for that method are scaled by both the value of the global flag and the value of the per-method flag.

share/compiler/compiler_globals.hpp

CompileThreshold

OpenJDK6

intx

aarch64

1500

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

CompileThreshold

OpenJDK6

intx

arm

10000

define_pd_global

cpu/arm/c2_globals_arm.hpp

CompileThreshold

OpenJDK6

intx

compiler

define_pd_global

share/compiler/compiler_globals_pd.hpp

CompileThreshold

OpenJDK6

intx

runtime

product_pd

number of interpreted method invocations before (re-)compiling

share/runtime/globals.hpp

CompileThreshold

OpenJDK6

intx

ppc

1000

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

CompileThreshold

OpenJDK6

intx

s390

10000

define_pd_global

cpu/s390/c2_globals_s390.hpp

CompileThreshold

OpenJDK6

intx

x86

1500

define_pd_global

cpu/x86/c1_globals_x86.hpp

CompilerDirectivesFile

OpenJDK9

ccstr

compiler

NULL

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

CompilerDirectivesIgnoreCompileCommands

OpenJDK9

bool

compiler

false

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

CompilerDirectivesLimit

OpenJDK9

int

compiler

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

CompilerDirectivesPrint

OpenJDK9

bool

compiler

false

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

CompilerThreadPriority

OpenJDK6

intx

runtime

-1
range(min_jint, max_jint)

product

The native priority at which compiler threads should run (-1 means no change)

share/runtime/globals.hpp

CompilerThreadStackSize

OpenJDK6

intx

aix

ppc

4096

define_pd_global

os_cpu/aix_ppc/globals_aix_ppc.hpp

CompilerThreadStackSize

OpenJDK6

intx

bsd

x86

512

define_pd_global

os_cpu/bsd_x86/globals_bsd_x86.hpp

CompilerThreadStackSize

OpenJDK6

intx

bsd

zero

define_pd_global

os_cpu/bsd_zero/globals_bsd_zero.hpp

CompilerThreadStackSize

OpenJDK6

intx

linux

aarch64

2048

define_pd_global

os_cpu/linux_aarch64/globals_linux_aarch64.hpp

CompilerThreadStackSize

OpenJDK6

intx

linux

arm

512

define_pd_global

os_cpu/linux_arm/globals_linux_arm.hpp

CompilerThreadStackSize

OpenJDK6

intx

linux

ppc

4096

define_pd_global

os_cpu/linux_ppc/globals_linux_ppc.hpp

CompilerThreadStackSize

OpenJDK6

intx

linux

s390

2048

define_pd_global

os_cpu/linux_s390/globals_linux_s390.hpp

CompilerThreadStackSize

OpenJDK6

intx

linux

x86

512

define_pd_global

os_cpu/linux_x86/globals_linux_x86.hpp

CompilerThreadStackSize

OpenJDK6

intx

linux

zero

define_pd_global

os_cpu/linux_zero/globals_linux_zero.hpp

CompilerThreadStackSize

OpenJDK6

intx

runtime

product_pd

Compiler Thread Stack Size (in Kbytes)

share/runtime/globals.hpp

CompilerThreadStackSize

OpenJDK6

intx

windows

aarch64

define_pd_global

os_cpu/windows_aarch64/globals_windows_aarch64.hpp

CompilerThreadStackSize

OpenJDK6

intx

windows

x86

define_pd_global

os_cpu/windows_x86/globals_windows_x86.hpp

CompressedClassSpaceSize

OpenJDK8

size_t

runtime

1*G
range(1*M, 3*G)

product

Maximum size of class area in Metaspace when compressed class pointers are used

share/runtime/globals.hpp

ComputeExactFPURegisterUsage

OpenJDK6

bool

true

develop

Compute additional live set for fpu registers to simplify fpu stack merge (Intel only)

share/c1/c1_globals.hpp

ConcGCThreads

OpenJDK6

uint

product

Number of threads concurrent gc will use

share/gc/shared/gc_globals.hpp

ConcGCYieldTimeout

OpenJDK6

intx

0
range(0, max_intx)

develop

If non-zero, assert that GC threads yield within this number of milliseconds

share/gc/shared/gc_globals.hpp

ConditionalMoveLimit

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

ConditionalMoveLimit

OpenJDK6

intx

arm

define_pd_global

cpu/arm/c2_globals_arm.hpp

ConditionalMoveLimit

OpenJDK6

intx

product_pd

Limit of ops to make speculative when using CMOVE

share/opto/c2_globals.hpp

ConditionalMoveLimit

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

ConditionalMoveLimit

OpenJDK6

intx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

ConditionalMoveLimit

OpenJDK6

intx

x86

define_pd_global

cpu/x86/c2_globals_x86.hpp

ContendedPaddingWidth

OpenJDK8

intx

runtime

128
range(0, 8192)

product

How many bytes to pad the fields/classes marked @Contended with

share/runtime/globals.hpp

ControlIntrinsic

OpenJDK16

ccstrlist

runtime

DIAGNOSTIC

product

Control intrinsics using a list of +/- (internal) names, separated by commas

share/runtime/globals.hpp

ConvertCmpD2CmpF

OpenJDK6

bool

true

develop

Convert cmpD to cmpF when one input is constant in float range

share/opto/c2_globals.hpp

ConvertFloat2IntClipping

OpenJDK6

bool

true

develop

Convert float2int clipping idiom to integer clipping

share/opto/c2_globals.hpp

CountBytecodes

OpenJDK6

bool

runtime

false

develop

Count number of bytecodes executed

share/runtime/globals.hpp

CountCompiledCalls

OpenJDK6

bool

runtime

false

develop

Count method invocations

share/runtime/globals.hpp

CountLinearScan

OpenJDK6

bool

false

develop

collect statistic counters during LinearScan

share/c1/c1_globals.hpp

CounterDecayMinIntervalLength

OpenJDK6

intx

runtime

500

develop

The minimum interval (in milliseconds) between invocation of CounterDecay

share/runtime/globals.hpp

CounterHalfLifeTime

OpenJDK6

intx

runtime

develop

Half-life time of invocation counters (in seconds)

share/runtime/globals.hpp

CrashGCForDumpingJavaThread

OpenJDK6

bool

runtime

false

notproduct

Manually make GC thread crash then dump java stack trace; Test only

share/runtime/globals.hpp

CrashOnOutOfMemoryError

OpenJDK8

bool

runtime

false

product

JVM aborts, producing an error log and core/mini dump, on the first occurrence of an out-of-memory error thrown from JVM

share/runtime/globals.hpp

CreateCoredumpOnCrash

OpenJDK9

bool

runtime

true

product

Create core/mini dump on VM fatal error

share/runtime/globals.hpp

CriticalJNINatives

OpenJDK6

Deprecated in JDK16
Obsoleted in JDK17
Expired in JDK18

bool

runtime

false

product

(Deprecated) Check for critical JNI entry points

share/runtime/globals.hpp

DSCR_DPFD_PPC64

OpenJDK9

uint64_t

ppc

product

Power8 or later: DPFD (default prefetch depth) value of the Data Stream Control Register. 0: hardware default, 1: none, 2-7: min-max, 8: don't touch

cpu/ppc/globals_ppc.hpp

DSCR_PPC64

OpenJDK9

uint64_t

ppc

(uint64_t)-1

product

Power8 or later: Specify encoded value for Data Stream Control Register

cpu/ppc/globals_ppc.hpp

DSCR_URG_PPC64

OpenJDK9

uint64_t

ppc

product

Power8 or later: URG (depth attainment urgency) value of the Data Stream Control Register. 0: hardware default, 1: none, 2-7: min-max, 8: don't touch

cpu/ppc/globals_ppc.hpp

DTraceAllocProbes

OpenJDK6

bool

runtime

false

product

Enable dtrace probes for object allocation

share/runtime/globals.hpp

DTraceMethodProbes

OpenJDK6

bool

runtime

false

product

Enable dtrace probes for method-entry and method-exit

share/runtime/globals.hpp

DTraceMonitorProbes

OpenJDK6

bool

runtime

false

product

Enable dtrace probes for monitor events

share/runtime/globals.hpp

DebugDeoptimization

OpenJDK6

bool

runtime

false

develop

Tracing various information while debugging deoptimization

share/runtime/globals.hpp

DebugInlinedCalls

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

DebugNonSafepoints

OpenJDK6

bool

runtime

trueInDebug

product

DIAGNOSTIC

share/runtime/globals.hpp

DebugVtables

OpenJDK6

bool

runtime

false

develop

add debugging code to vtable dispatch

share/runtime/globals.hpp

DeferInitialCardMark

OpenJDK6

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

DeoptC1

OpenJDK6

bool

true

develop

Use deoptimization in C1

share/c1/c1_globals.hpp

DeoptimizeALotInterval

OpenJDK6

intx

runtime

notproduct

Number of exits until DeoptimizeALot kicks in

share/runtime/globals.hpp

DeoptimizeALot

OpenJDK6

bool

runtime

false

develop

Deoptimize at every exit from the runtime system

share/runtime/globals.hpp

DeoptimizeNMethodBarriersALot

OpenJDK15

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

DeoptimizeObjectsALotInterval

OpenJDK16

uint64_t

runtime

5
range(0, max_jlong)

develop

Interval for DeoptimizeObjectsALot.

share/runtime/globals.hpp

DeoptimizeObjectsALotThreadCountAll

OpenJDK16

int

runtime

1
range(0, max_jint)

develop

The number of threads that revert optimizations based on escape analysis for all threads if DeoptimizeObjectsALot is enabled.

share/runtime/globals.hpp

DeoptimizeObjectsALotThreadCountSingle

OpenJDK16

int

runtime

1
range(0, max_jint)

develop

The number of threads that revert optimizations based on escape analysis for a single thread if DeoptimizeObjectsALot is enabled. The target thread is selected round robin.

share/runtime/globals.hpp

DeoptimizeObjectsALot

OpenJDK16

bool

runtime

false

develop

For testing purposes concurrent threads revert optimizations based on escape analysis at intervals given with DeoptimizeObjectsALotInterval=n. The thread count is given with DeoptimizeObjectsALotThreadCountSingle and DeoptimizeObjectsALotThreadCountAll.

share/runtime/globals.hpp

DeoptimizeOnlyAt

OpenJDK6

ccstrlist

runtime

A comma separated list of bcis to deoptimize at

notproduct

share/runtime/globals.hpp

DeoptimizeRandom

OpenJDK6

bool

runtime

false

develop

Deoptimize random frames on random exit from the runtime system

share/runtime/globals.hpp

DesiredMethodLimit

OpenJDK6

intx

compiler

8000

develop

The desired maximum method size (in bytecodes) after inlining

share/compiler/compiler_globals.hpp

DiagnoseSyncOnValueBasedClasses

OpenJDK16

intx

runtime

0
range(0, 2)

product

DIAGNOSTIC

share/runtime/globals.hpp

DisableAttachMechanism

OpenJDK6

bool

runtime

false

product

Disable mechanism that allows tools to attach to this VM

share/runtime/globals.hpp

DisableExplicitGC

OpenJDK6

bool

false

product

Ignore calls to System.gc()

share/gc/shared/gc_globals.hpp

DisableIntrinsic

OpenJDK6

ccstrlist

runtime

DIAGNOSTIC

product

do not expand intrinsics whose (internal) names appear here

share/runtime/globals.hpp

DisablePrimordialThreadGuardPages

OpenJDK8

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

DisplayVMOutputToStderr

OpenJDK6

bool

runtime

false

product

If DisplayVMOutput is true, display all VM output to stderr

share/runtime/globals.hpp

DisplayVMOutputToStdout

OpenJDK6

bool

runtime

false

product

If DisplayVMOutput is true, display all VM output to stdout

share/runtime/globals.hpp

DisplayVMOutput

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

DoCEE

OpenJDK6

bool

true

develop

Do Conditional Expression Elimination to simplify CFG

share/c1/c1_globals.hpp

DoEscapeAnalysis

OpenJDK6

bool

true

product

Perform escape analysis

share/opto/c2_globals.hpp

DoReserveCopyInSuperWord

OpenJDK9

bool

true

product

Create reserve copy of graph in SuperWord.

share/opto/c2_globals.hpp

DominatorSearchLimit

OpenJDK6

intx

1000
range(0, max_jint)

product

DIAGNOSTIC

share/opto/c2_globals.hpp

DontCompileHugeMethods

OpenJDK6

bool

compiler

true

product

Do not compile methods > HugeMethodLimit

share/compiler/compiler_globals.hpp

DontYieldALotInterval

OpenJDK6

intx

runtime

develop

Interval between which yields will be dropped (milliseconds)

share/runtime/globals.hpp

DontYieldALot

OpenJDK6

bool

aix

ppc

false

define_pd_global

os_cpu/aix_ppc/globals_aix_ppc.hpp

DontYieldALot

OpenJDK6

bool

bsd

x86

false

define_pd_global

os_cpu/bsd_x86/globals_bsd_x86.hpp

DontYieldALot

OpenJDK6

bool

bsd

zero

false

define_pd_global

os_cpu/bsd_zero/globals_bsd_zero.hpp

DontYieldALot

OpenJDK6

bool

linux

aarch64

false

define_pd_global

os_cpu/linux_aarch64/globals_linux_aarch64.hpp

DontYieldALot

OpenJDK6

bool

linux

arm

false

define_pd_global

os_cpu/linux_arm/globals_linux_arm.hpp

DontYieldALot

OpenJDK6

bool

linux

ppc

false

define_pd_global

os_cpu/linux_ppc/globals_linux_ppc.hpp

DontYieldALot

OpenJDK6

bool

linux

s390

false

define_pd_global

os_cpu/linux_s390/globals_linux_s390.hpp

DontYieldALot

OpenJDK6

bool

linux

x86

false

define_pd_global

os_cpu/linux_x86/globals_linux_x86.hpp

DontYieldALot

OpenJDK6

bool

linux

zero

false

define_pd_global

os_cpu/linux_zero/globals_linux_zero.hpp

DontYieldALot

OpenJDK6

bool

runtime

product_pd

Throw away obvious excess yield calls

share/runtime/globals.hpp

DontYieldALot

OpenJDK6

bool

windows

aarch64

false

define_pd_global

os_cpu/windows_aarch64/globals_windows_aarch64.hpp

DontYieldALot

OpenJDK6

bool

windows

x86

false

define_pd_global

os_cpu/windows_x86/globals_windows_x86.hpp

DumpLoadedClassList

OpenJDK8

ccstr

runtime

NULL

product

Dump the names all loaded classes, that could be stored into the CDS archive, in the specified file

share/runtime/globals.hpp

DumpPerfMapAtExit

OpenJDK16

bool

linux

false

product

DIAGNOSTIC

os/linux/globals_linux.hpp

DumpPrivateMappingsInCore

OpenJDK11

bool

linux

true

product

DIAGNOSTIC

os/linux/globals_linux.hpp

DumpReplayDataOnError

OpenJDK8

bool

compiler

true

product

Record replay data for crashing compiler threads

share/compiler/compiler_globals.hpp

DumpSharedMappingsInCore

OpenJDK11

bool

linux

true

product

DIAGNOSTIC

os/linux/globals_linux.hpp

DumpSharedSpaces

OpenJDK6

bool

runtime

false

product

Special mode: JVM reads a class list, loads classes, builds shared spaces, and dumps the shared spaces to a file to be used in future JVM runs

share/runtime/globals.hpp

DynamicDumpSharedSpaces

OpenJDK13

bool

runtime

false

product

Dynamic archive

share/runtime/globals.hpp

DynamicallyResizeSystemDictionaries

OpenJDK10

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

EagerInitialization

OpenJDK6

bool

runtime

false

develop

Eagerly initialize classes if possible

share/runtime/globals.hpp

EagerJVMCI

OpenJDK11

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

EagerXrunInit

OpenJDK6

bool

runtime

false

product

Eagerly initialize -Xrun libraries; allows startup profiling, but not all -Xrun libraries may support the state of the VM at this time

share/runtime/globals.hpp

EliminateAllocationArraySizeLimit

OpenJDK6

intx

64
range(0, max_jint)

product

Array size (number of elements) limit for scalar replacement

share/opto/c2_globals.hpp

EliminateAllocationFieldsLimit

OpenJDK17

intx

512
range(0, max_jint)

product

DIAGNOSTIC

share/opto/c2_globals.hpp

EliminateAllocations

OpenJDK6

bool

true

product

Use escape analysis to eliminate allocations

share/opto/c2_globals.hpp

EliminateAutoBox

OpenJDK6

bool

true

product

Control optimizations for autobox elimination

share/opto/c2_globals.hpp

EliminateBlocks

OpenJDK6

bool

true

develop

Eliminate unneccessary basic blocks

share/c1/c1_globals.hpp

EliminateFieldAccess

OpenJDK6

bool

true

develop

Optimize field loads and stores

share/c1/c1_globals.hpp

EliminateLocks

OpenJDK6

bool

true

product

Coarsen locks when possible

share/opto/c2_globals.hpp

EliminateNestedLocks

OpenJDK6

bool

true

product

Eliminate nested locks of the same object when possible

share/opto/c2_globals.hpp

EliminateNullChecks

OpenJDK6

bool

true

develop

Eliminate unneccessary null checks

share/c1/c1_globals.hpp

EnableContended

OpenJDK8

bool

runtime

true

product

Enable @Contended annotation support

share/runtime/globals.hpp

EnableDynamicAgentLoading

OpenJDK9

bool

runtime

true

product

Allow tools to load agents with the attach mechanism

share/runtime/globals.hpp

EnableJVMCIProduct

OpenJDK14

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

EnableJVMCI

OpenJDK9

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

EnableJVMTIStackDepthAsserts

OpenJDK17

bool

runtime

true

notproduct

Enable JVMTI asserts related to stack depth checks

share/runtime/globals.hpp

EnableThreadSMRExtraValidityChecks

OpenJDK10

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

EnableThreadSMRStatistics

OpenJDK10

bool

runtime

trueInDebug

product

DIAGNOSTIC

share/runtime/globals.hpp

EnableVectorAggressiveReboxing

OpenJDK16

bool

false

product

EXPERIMENTAL

share/opto/c2_globals.hpp

EnableVectorReboxing

OpenJDK16

bool

false

product

EXPERIMENTAL

share/opto/c2_globals.hpp

EnableVectorSupport

OpenJDK16

bool

false

product

EXPERIMENTAL

share/opto/c2_globals.hpp

EpsilonElasticTLABDecay

OpenJDK11

bool

true

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonElasticTLAB

OpenJDK11

bool

true

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonMaxTLABSize

OpenJDK11

size_t

4 * M
range(1, max_intx)

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonMinHeapExpand

OpenJDK11

size_t

128 * M
range(1, max_intx)

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonPrintHeapSteps

OpenJDK11

size_t

20
range(0, max_intx)

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonTLABDecayTime

OpenJDK11

size_t

1000
range(1, max_intx)

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonTLABElasticity

OpenJDK11

double

1.1
range(1.0, DBL_MAX)

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

EpsilonUpdateCountersStep

OpenJDK11

size_t

1 * M
range(1, max_intx)

product

EXPERIMENTAL

share/gc/epsilon/epsilon_globals.hpp

ErgoHeapSizeLimit

OpenJDK6

size_t

0
range(0, max_uintx)

product

Maximum ergonomically set heap size (in bytes); zero means use MaxRAM * MaxRAMPercentage / 100

share/gc/shared/gc_globals.hpp

ErrorFileToStderr

OpenJDK11

bool

runtime

false

product

If true, error data is printed to stderr instead of a file

share/runtime/globals.hpp

ErrorFileToStdout

OpenJDK11

bool

runtime

false

product

If true, error data is printed to stdout instead of a file

share/runtime/globals.hpp

ErrorFile

OpenJDK6

ccstr

runtime

NULL

product

If an error occurs, save the error data to this file [default: ./hs_err_pid%p.log] (%p replaced with pid)

share/runtime/globals.hpp

ErrorHandlerTest

OpenJDK6

uintx

runtime

0
range(0, 17)

develop

If > 0, provokes an error after VM initialization; the value determines which error to provoke. See controlled_crash() in vmError.cpp.

share/runtime/globals.hpp

ErrorLogTimeout

OpenJDK9

uint64_t

runtime

2 * 60
range(0, (uint64_t)max_jlong/1000)

product

Timeout, in seconds, to limit the time spent on writing an error log in case of a crash.

share/runtime/globals.hpp

EscapeAnalysisTimeout

OpenJDK7

double

20. DEBUG_ONLY(+40.)
range(0, DBL_MAX)

product

Abort EA when it reaches time limit (in sec)

share/opto/c2_globals.hpp

EstimateArgEscape

OpenJDK6

bool

compiler

true

product

Analyze bytecodes to estimate escape state of arguments

share/compiler/compiler_globals.hpp

ExecutingUnitTests

OpenJDK9

bool

runtime

false

product

Whether the JVM is running unit tests or not

share/runtime/globals.hpp

ExitEscapeAnalysisOnTimeout

OpenJDK7

bool

true

develop

Exit or throw assert in EA when it reaches time limit

share/opto/c2_globals.hpp

ExitOnFullCodeCache

OpenJDK6

bool

runtime

false

notproduct

Exit the VM if we fill the code cache

share/runtime/globals.hpp

ExitOnOutOfMemoryError

OpenJDK8

bool

runtime

false

product

JVM exits on the first occurrence of an out-of-memory error thrown from JVM

share/runtime/globals.hpp

ExpandLoadingBaseDecode_NN

OpenJDK9

bool

s390

true

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

ExpandLoadingBaseDecode

OpenJDK9

bool

s390

true

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

ExpandLoadingBaseEncode_NN

OpenJDK9

bool

s390

true

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

ExpandLoadingBaseEncode

OpenJDK9

bool

s390

true

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

ExpandSubTypeCheckAtParseTime

OpenJDK15

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

ExplicitGCInvokesConcurrent

OpenJDK6

bool

false

product

A System.gc() request invokes a concurrent collection; (effective only when using concurrent collectors)

share/gc/shared/gc_globals.hpp

ExtendedDTraceProbes

OpenJDK6

bool

runtime

false

product

Enable performance-impacting dtrace probes

share/runtime/globals.hpp

ExtensiveErrorReports

OpenJDK11

bool

runtime

PRODUCT_ONLY(false) NOT_PRODUCT(true)

product

Error reports are more extensive.

share/runtime/globals.hpp

ExtraSharedClassListFile

OpenJDK8

ccstr

runtime

NULL

product

Extra classlist for building the CDS archive file

share/runtime/globals.hpp

FLOATPRESSURE

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

FLOATPRESSURE

OpenJDK6

intx

arm

define_pd_global

cpu/arm/c2_globals_arm.hpp

FLOATPRESSURE

OpenJDK6

intx

develop_pd

Number of float LRG's that constitute high register pressure

share/opto/c2_globals.hpp

FLOATPRESSURE

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

FLOATPRESSURE

OpenJDK6

intx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

FLOATPRESSURE

OpenJDK6

intx

x86

define_pd_global

cpu/x86/c2_globals_x86.hpp

FLSVerifyDictionary

OpenJDK6

bool

runtime

false

develop

Do lots of (expensive) FLS dictionary verification

share/runtime/globals.hpp

FastAllocateSizeLimit

OpenJDK6

intx

runtime

128*K

develop

/* Note: This value is zero mod 1<<13 for a cheap sparc set. */Inline allocations larger than this in doublewords must go slow

share/runtime/globals.hpp

FilterSpuriousWakeups

OpenJDK6

bool

runtime

true

product

When true prevents OS-level spurious, or premature, wakeups from Object.wait (Ignored for Windows)

share/runtime/globals.hpp

FlightRecorderOptions

OpenJDK11

ccstr

runtime

NULL

product

Flight Recorder options

share/runtime/globals.hpp

FlightRecorder

OpenJDK11

Deprecated in JDK13

bool

runtime

false

product

(Deprecated) Enable Flight Recorder

share/runtime/globals.hpp

FoldStableValues

OpenJDK8

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

ForceTimeHighResolution

OpenJDK6

bool

runtime

false

product

Using high time resolution (for Win32 only)

share/runtime/globals.hpp

ForceUnreachable

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

FreqCountInvocations

OpenJDK6

intx

1
range(1, max_intx)

develop

Scaling factor for branch frequencies (deprecated)

share/opto/c2_globals.hpp

FreqInlineSize

OpenJDK6

intx

aarch64

325

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

FreqInlineSize

OpenJDK6

intx

arm

175

define_pd_global

cpu/arm/c2_globals_arm.hpp

FreqInlineSize

OpenJDK6

intx

product_pd

The maximum bytecode size of a frequent method to be inlined

share/opto/c2_globals.hpp

FreqInlineSize

OpenJDK6

intx

ppc

175

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

FreqInlineSize

OpenJDK6

intx

s390

175

define_pd_global

cpu/s390/c2_globals_s390.hpp

FreqInlineSize

OpenJDK6

intx

x86

325

define_pd_global

cpu/x86/c2_globals_x86.hpp

FullGCALotDummies

OpenJDK6

intx

32*K

notproduct

Dummy object allocated with +FullGCALot, forcing all objects to move

share/gc/shared/gc_globals.hpp

FullGCALotInterval

OpenJDK6

intx

notproduct

Interval between which full gc will occur with +FullGCALot

share/gc/shared/gc_globals.hpp

FullGCALotStart

OpenJDK6

intx

notproduct

For which invocation to start FullGCAlot

share/gc/shared/gc_globals.hpp

FullGCALot

OpenJDK6

bool

false

develop

Force full gc at every Nth exit from the runtime system (N=FullGCALotInterval)

share/gc/shared/gc_globals.hpp

G1AdaptiveIHOPNumInitialSamples

OpenJDK9

size_t

3
range(1, max_intx)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1ConcMarkStepDurationMillis

OpenJDK6

double

10.0
range(1.0, DBL_MAX)

product

Target duration of individual concurrent marking steps in milliseconds.

share/gc/g1/g1_globals.hpp

G1ConcRSHotCardLimit

OpenJDK6

uintx

4
range(0, max_jubyte)

product

The threshold that defines (>=) a hot card.

share/gc/g1/g1_globals.hpp

G1ConcRSLogCacheSize

OpenJDK6

size_t

10
range(0, 27)

product

Log base 2 of the length of conc RS hot-card cache.

share/gc/g1/g1_globals.hpp

G1ConcRefinementGreenZone

OpenJDK6

size_t

0
range(0, max_intx)

product

The number of update buffers that are left in the queue by the concurrent processing threads. Will be selected ergonomically by default.

share/gc/g1/g1_globals.hpp

G1ConcRefinementRedZone

OpenJDK6

size_t

0
range(0, max_intx)

product

Maximum number of enqueued update buffers before mutator threads start processing new ones instead of enqueueing them. Will be selected ergonomically by default.

share/gc/g1/g1_globals.hpp

G1ConcRefinementServiceIntervalMillis

OpenJDK6

uintx

300
range(0, max_jint)

product

The G1 service thread wakes up every specified number of milliseconds to do miscellaneous work.

share/gc/g1/g1_globals.hpp

G1ConcRefinementThreads

OpenJDK6

uint

0
range(0, (max_jint-1)/wordSize)

product

The number of parallel rem set update threads. Will be set ergonomically by default.

share/gc/g1/g1_globals.hpp

G1ConcRefinementThresholdStep

OpenJDK6

size_t

2
range(1, SIZE_MAX)

product

Each time the rset update queue increases by this amount activate the next refinement thread if available. The actual step size will be selected ergonomically by default, with this value used to determine a lower bound.

share/gc/g1/g1_globals.hpp

G1ConcRefinementYellowZone

OpenJDK6

size_t

0
range(0, max_intx)

product

Number of enqueued update buffers that will trigger concurrent processing. Will be selected ergonomically by default.

share/gc/g1/g1_globals.hpp

G1ConfidencePercent

OpenJDK6

uintx

50
range(0, 100)

product

Confidence level for MMU/pause predictions

share/gc/g1/g1_globals.hpp

G1DummyRegionsPerGC

OpenJDK6

uintx

develop

The number of dummy regions G1 will allocate at the end of each evacuation pause in order to artificially fill up the heap and stress the marking implementation.

share/gc/g1/g1_globals.hpp

G1EagerReclaimHumongousObjectsWithStaleRefs

OpenJDK8

bool

true

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1EagerReclaimHumongousObjects

OpenJDK8

bool

true

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALotCount

OpenJDK7

uintx

1000

develop

Number of successful evacuations between evacuation failures occurring at object copying

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALotDuringConcMark

OpenJDK7

bool

true

develop

Force use of evacuation failure handling during evacuation pauses when marking is in progress

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALotDuringConcurrentStart

OpenJDK16

bool

true

develop

Force use of evacuation failure handling during concurrent start evacuation pauses

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALotDuringMixedGC

OpenJDK7

bool

true

develop

Force use of evacuation failure handling during mixed evacuation pauses

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALotDuringYoungGC

OpenJDK7

bool

true

develop

Force use of evacuation failure handling during young evacuation pauses

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALotInterval

OpenJDK7

uintx

develop

Total collections between forced triggering of evacuation failures

share/gc/g1/g1_globals.hpp

G1EvacuationFailureALot

OpenJDK7

bool

false

notproduct

Force use of evacuation failure handling during certain evacuation pauses

share/gc/g1/g1_globals.hpp

G1ExitOnExpansionFailure

OpenJDK6

bool

false

develop

Raise a fatal VM exit out of memory failure in the event that heap expansion fails due to running out of swap.

share/gc/g1/g1_globals.hpp

G1ExpandByPercentOfAvailable

OpenJDK6

intx

20
range(0, 100)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1HeapRegionSize

OpenJDK6

size_t

0
range(0, 32*M)

product

Size of the G1 regions.

share/gc/g1/g1_globals.hpp

G1HeapWastePercent

OpenJDK7

uintx

5
range(0, 100)

product

Amount of space, expressed as a percentage of the heap size, that G1 is willing not to collect to avoid expensive GCs.

share/gc/g1/g1_globals.hpp

G1LastPLABAverageOccupancy

OpenJDK9

double

50.0
range(0.001, 100.0)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1MaxNewSizePercent

OpenJDK7

uintx

60
range(0, 100)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1MaxVerifyFailures

OpenJDK6

intx

-1
range(-1, max_jint)

develop

The maximum number of verification failures to print. -1 means print all.

share/gc/g1/g1_globals.hpp

G1MixedGCCountTarget

OpenJDK7

uintx

8
range(0, max_uintx)

product

The target number of mixed GCs after a marking cycle.

share/gc/g1/g1_globals.hpp

G1MixedGCLiveThresholdPercent

OpenJDK7

uintx

85
range(0, 100)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1NewSizePercent

OpenJDK7

uintx

5
range(0, 100)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1OldCSetRegionThresholdPercent

OpenJDK6

uintx

10
range(0, 100)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1PeriodicGCInterval

OpenJDK12

uintx

product

MANAGEABLE

share/gc/g1/g1_globals.hpp

G1PeriodicGCInvokesConcurrent

OpenJDK12

bool

true

product

Determines the kind of periodic GC. Set to true to have G1 perform a concurrent GC as periodic GC, otherwise use a STW Full GC.

share/gc/g1/g1_globals.hpp

G1PeriodicGCSystemLoadThreshold

OpenJDK12

double

0.0
range(0.0, (double)max_uintx)

product

MANAGEABLE

share/gc/g1/g1_globals.hpp

G1RSetRegionEntriesBase

OpenJDK6

intx

256
range(1, max_jint/wordSize)

develop

Max number of regions in a fine-grain table per MB.

share/gc/g1/g1_globals.hpp

G1RSetRegionEntries

OpenJDK6

intx

0
range(0, max_jint/wordSize)

product

Max number of regions for which we keep bitmaps.Will be set ergonomically by default

share/gc/g1/g1_globals.hpp

G1RSetSparseRegionEntriesBase

OpenJDK6

intx

4
range(1, max_jint/wordSize)

develop

Max number of entries per region in a sparse table per MB.

share/gc/g1/g1_globals.hpp

G1RSetSparseRegionEntries

OpenJDK6

intx

0
range(0, max_jint/wordSize)

product

Max number of entries per region in a sparse table.Will be set ergonomically by default.

share/gc/g1/g1_globals.hpp

G1RSetUpdatingPauseTimePercent

OpenJDK6

intx

10
range(0, 100)

product

A target percentage of time that is allowed to be spend on process RS update buffers during the collection pause.

share/gc/g1/g1_globals.hpp

G1RebuildRemSetChunkSize

OpenJDK11

size_t

256 * K
range(4 * K, 32 * M)

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1RefProcDrainInterval

OpenJDK6

uint

1000
range(1, INT_MAX)

product

The number of discovered reference objects to process before draining concurrent marking work queues.

share/gc/g1/g1_globals.hpp

G1ReservePercent

OpenJDK6

uintx

10
range(0, 50)

product

It determines the minimum reserve we should have in the heap to minimize the probability of promotion failure.

share/gc/g1/g1_globals.hpp

G1SATBBufferEnqueueingThresholdPercent

OpenJDK6

uintx

60
range(0, 100)

product

Before enqueueing them, each mutator thread tries to do some filtering on the SATB buffers it generates. If post-filtering the percentage of retained entries is over this threshold the buffer will be enqueued for processing. A value of 0 specifies that mutator threads should not do such filtering.

share/gc/g1/g1_globals.hpp

G1SATBBufferSize

OpenJDK6

size_t

1*K
range(1, max_uintx)

product

Number of entries in an SATB log buffer.

share/gc/g1/g1_globals.hpp

G1SATBProcessCompletedThreshold

OpenJDK6

intx

20
range(0, max_jint)

develop

Number of completed buffers that triggers log processing.

share/gc/g1/g1_globals.hpp

G1SummarizeRSetStatsPeriod

OpenJDK6

intx

0
range(0, max_intx)

product

DIAGNOSTIC

share/gc/g1/g1_globals.hpp

G1UpdateBufferSize

OpenJDK6

size_t

256
range(1, NOT_LP64(32*M) LP64_ONLY(1*G))

product

Size of an update buffer

share/gc/g1/g1_globals.hpp

G1UseAdaptiveConcRefinement

OpenJDK6

bool

true

product

Select green, yellow and red zones adaptively to meet the the pause requirements.

share/gc/g1/g1_globals.hpp

G1UseAdaptiveIHOP

OpenJDK9

bool

true

product

Adaptively adjust the initiating heap occupancy from the initial value of InitiatingHeapOccupancyPercent. The policy attempts to start marking in time based on application behavior.

share/gc/g1/g1_globals.hpp

G1UseReferencePrecleaning

OpenJDK11

bool

true

product

EXPERIMENTAL

share/gc/g1/g1_globals.hpp

G1VerifyBitmaps

OpenJDK8

bool

false

develop

Verifies the consistency of the marking bitmaps

share/gc/g1/g1_globals.hpp

G1VerifyCTCleanup

OpenJDK6

bool

false

develop

Verify card table cleanup.

share/gc/g1/g1_globals.hpp

G1VerifyHeapRegionCodeRoots

OpenJDK7

bool

false

product

DIAGNOSTIC

share/gc/g1/g1_globals.hpp

G1VerifyRSetsDuringFullGC

OpenJDK7

bool

false

product

DIAGNOSTIC

share/gc/g1/g1_globals.hpp

GCALotAtAllSafepoints

OpenJDK6

bool

false

notproduct

Enforce ScavengeALot/GCALot at all potential safepoints

share/gc/shared/gc_globals.hpp

GCDrainStackTargetSize

OpenJDK6

uintx

64
range(0, max_juint)

product

Number of entries we will try to leave on the stack during parallel gc

share/gc/shared/gc_globals.hpp

GCExpandToAllocateDelayMillis

OpenJDK6

uintx

develop

Delay between expansion and allocation (in milliseconds)

share/gc/shared/gc_globals.hpp

GCHeapFreeLimit

OpenJDK6

uintx

2
range(0, 100)

product

Minimum percentage of free space after a full GC before an OutOfMemoryError is thrown (used with GCTimeLimit)

share/gc/shared/gc_globals.hpp

GCLockerEdenExpansionPercent

OpenJDK6

uintx

5
range(0, 100)

product

How much the GC can expand the eden by while the GC locker is active (as a percentage)

share/gc/shared/gc_globals.hpp

GCLockerRetryAllocationCount

OpenJDK8

uintx

2
range(0, max_uintx)

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

GCOverheadLimitThreshold

OpenJDK13

uintx

5
range(1, max_uintx)

develop

Number of consecutive collections before gc time limit fires

share/gc/shared/gc_globals.hpp

GCParallelVerificationEnabled

OpenJDK6

bool

true

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

GCPauseIntervalMillis

OpenJDK6

uintx

product

Time slice for MMU specification

share/gc/shared/gc_globals.hpp

GCTimeLimit

OpenJDK6

uintx

98
range(0, 100)

product

Limit of the proportion of time spent in GC before an OutOfMemoryError is thrown (used with GCHeapFreeLimit)

share/gc/shared/gc_globals.hpp

GCTimeRatio

OpenJDK6

uintx

99
range(0, max_juint)

product

Adaptive size policy application time to GC time ratio

share/gc/shared/gc_globals.hpp

GCWorkerDelayMillis

OpenJDK8

uintx

develop

Delay in scheduling GC workers (in milliseconds)

share/gc/parallel/parallel_globals.hpp

GenerateArrayStoreCheck

OpenJDK6

bool

true

develop

Generates code for array store checks

share/c1/c1_globals.hpp

GenerateRangeChecks

OpenJDK6

bool

runtime

true

develop

Generate range checks for array accesses

share/runtime/globals.hpp

GenerateSynchronizationCode

OpenJDK6

bool

runtime

true

develop

generate locking/unlocking code for synchronized methods and monitors

share/runtime/globals.hpp

GuaranteedSafepointInterval

OpenJDK9

intx

runtime

1000
range(0, max_jint)

product

DIAGNOSTIC

share/runtime/globals.hpp

HandshakeALot

OpenJDK13

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

HandshakeTimeout

OpenJDK10

uint

runtime

product

DIAGNOSTIC

share/runtime/globals.hpp

HeapBaseMinAddress

OpenJDK6

size_t

aix

ppc

2*G

define_pd_global

os_cpu/aix_ppc/globals_aix_ppc.hpp

HeapBaseMinAddress

OpenJDK6

size_t

bsd

x86

2*G

define_pd_global

os_cpu/bsd_x86/globals_bsd_x86.hpp

HeapBaseMinAddress

OpenJDK6

size_t

bsd

zero

2*G

define_pd_global

os_cpu/bsd_zero/globals_bsd_zero.hpp

HeapBaseMinAddress

OpenJDK6

uintx

linux

aarch64

2*G

define_pd_global

os_cpu/linux_aarch64/globals_linux_aarch64.hpp

HeapBaseMinAddress

OpenJDK6

size_t

linux

arm

2*G

define_pd_global

os_cpu/linux_arm/globals_linux_arm.hpp

HeapBaseMinAddress

OpenJDK6

size_t

linux

ppc

2*G

define_pd_global

os_cpu/linux_ppc/globals_linux_ppc.hpp

HeapBaseMinAddress

OpenJDK6

size_t

linux

s390

2*G

define_pd_global

os_cpu/linux_s390/globals_linux_s390.hpp

HeapBaseMinAddress

OpenJDK6

size_t

linux

x86

2*G

define_pd_global

os_cpu/linux_x86/globals_linux_x86.hpp

HeapBaseMinAddress

OpenJDK6

size_t

linux

zero

2*G

define_pd_global

os_cpu/linux_zero/globals_linux_zero.hpp

HeapBaseMinAddress

OpenJDK6

size_t

product_pd

OS specific low limit for heap base address

share/gc/shared/gc_globals.hpp

HeapBaseMinAddress

OpenJDK6

uintx

windows

aarch64

2*G

define_pd_global

os_cpu/windows_aarch64/globals_windows_aarch64.hpp

HeapBaseMinAddress

OpenJDK6

size_t

windows

x86

2*G

define_pd_global

os_cpu/windows_x86/globals_windows_x86.hpp

HeapDumpAfterFullGC

OpenJDK6

bool

runtime

false

product

MANAGEABLE

share/runtime/globals.hpp

HeapDumpBeforeFullGC

OpenJDK6

bool

runtime

false

product

MANAGEABLE

share/runtime/globals.hpp

HeapDumpOnOutOfMemoryError

OpenJDK6

bool

runtime

false

product

MANAGEABLE

share/runtime/globals.hpp

HeapDumpPath

OpenJDK6

ccstr

runtime

NULL

product

MANAGEABLE

share/runtime/globals.hpp

HeapFirstMaximumCompactionCount

OpenJDK6

uintx

3
range(0, max_uintx)

product

The collection count for the first maximum compaction

share/gc/parallel/parallel_globals.hpp

HeapMaximumCompactionInterval

OpenJDK6

uintx

20
range(0, max_uintx)

product

How often should we maximally compact the heap (not allowing any dead space)

share/gc/parallel/parallel_globals.hpp

HeapSearchSteps

OpenJDK9

uintx

runtime

3 PPC64_ONLY(+17)
range(1, max_uintx)

product

Heap allocation steps through preferred address regions to find where it can allocate the heap. Number of steps to take per region.

share/runtime/globals.hpp

HeapSizePerGCThread

OpenJDK6

size_t

ScaleForWordSize(32*M)

product

Size of heap (bytes) per GC thread used in calculating the number of GC threads

share/gc/shared/gc_globals.hpp

HotCallCountThreshold

OpenJDK6

intx

999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

large numbers of calls (per method invocation) force hotness

share/opto/c2_globals.hpp

HotCallProfitThreshold

OpenJDK6

intx

999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

highly profitable inlining opportunities force hotness

share/opto/c2_globals.hpp

HotCallTrivialSize

OpenJDK6

intx

-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

trivial methods (no larger than this) force calls to be hot

share/opto/c2_globals.hpp

HotCallTrivialWork

OpenJDK6

intx

-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

trivial execution time (no larger than this) forces hotness

share/opto/c2_globals.hpp

HotMethodDetectionLimit

OpenJDK9

intx

runtime

100000
range(1, max_jint)

product

DIAGNOSTIC

share/runtime/globals.hpp

HugeMethodLimit

OpenJDK6

intx

compiler

8000

develop

Don't compile methods larger than this if +DontCompileHugeMethods

share/compiler/compiler_globals.hpp

ICMissHistogram

OpenJDK6

bool

runtime

false

notproduct

Produce histogram of IC misses

share/runtime/globals.hpp

IEEEPrecision

OpenJDK6

bool

x86

true

develop

Enables IEEE precision (for INTEL only)

cpu/x86/globals_x86.hpp

INTPRESSURE

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

INTPRESSURE

OpenJDK6

intx

arm

define_pd_global

cpu/arm/c2_globals_arm.hpp

INTPRESSURE

OpenJDK6

intx

develop_pd

Number of integer LRG's that constitute high register pressure

share/opto/c2_globals.hpp

INTPRESSURE

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

INTPRESSURE

OpenJDK6

intx

s390

define_pd_global

// Medium size register set, 6 special purpose regs, 3 SOE regs.

cpu/s390/c2_globals_s390.hpp

INTPRESSURE

OpenJDK6

intx

x86

define_pd_global

cpu/x86/c2_globals_x86.hpp

IdealizeClearArrayNode

OpenJDK9

bool

aarch64

true

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

IdealizeClearArrayNode

OpenJDK9

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

IdealizeClearArrayNode

OpenJDK9

bool

product_pd

DIAGNOSTIC

share/opto/c2_globals.hpp

IdealizeClearArrayNode

OpenJDK9

bool

ppc

true

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

IdealizeClearArrayNode

OpenJDK9

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

IdealizeClearArrayNode

OpenJDK9

bool

x86

true

define_pd_global

cpu/x86/c2_globals_x86.hpp

IdealizedNumerics

OpenJDK6

bool

false

develop

Check performance difference allowing FP associativity and commutativity...

share/opto/c2_globals.hpp

IgnoreEmptyClassPaths

OpenJDK8

bool

runtime

false

product

Ignore empty path elements in -classpath

share/runtime/globals.hpp

IgnoreUnrecognizedVMOptions

OpenJDK6

bool

runtime

false

product

Ignore unrecognized VM options

share/runtime/globals.hpp

ImplicitDiv0Checks

OpenJDK6

bool

true

develop

Use implicit division by zero checks

share/c1/c1_globals.hpp

ImplicitNullCheckThreshold

OpenJDK6

intx

3
range(0, max_jint)

develop

Don't do implicit null checks if NPE's in a method exceeds limit

share/opto/c2_globals.hpp

ImplicitNullChecks

OpenJDK6

bool

aarch64

true

define_pd_global

// Generate code for implicit null checks

cpu/aarch64/globals_aarch64.hpp

ImplicitNullChecks

OpenJDK6

bool

arm

true

define_pd_global

// Generate code for implicit null checks

cpu/arm/globals_arm.hpp

ImplicitNullChecks

OpenJDK6

bool

runtime

product_pd

DIAGNOSTIC

share/runtime/globals.hpp

ImplicitNullChecks

OpenJDK6

bool

ppc

true

define_pd_global

// Generate code for implicit null checks.

cpu/ppc/globals_ppc.hpp

ImplicitNullChecks

OpenJDK6

bool

s390

true

define_pd_global

// Generate code for implicit null checks.

cpu/s390/globals_s390.hpp

ImplicitNullChecks

OpenJDK6

bool

x86

true

define_pd_global

// Generate code for implicit null checks

cpu/x86/globals_x86.hpp

ImplicitNullChecks

OpenJDK6

bool

zero

true

define_pd_global

cpu/zero/globals_zero.hpp

IncreaseFirstTierCompileThresholdAt

OpenJDK8

uintx

compiler

50
range(0, 99)

product

Increase the compile threshold for C1 compilation if the code cache is filled by the specified percentage

share/compiler/compiler_globals.hpp

IncrementalInlineForceCleanup

OpenJDK16

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

IncrementalInlineMH

OpenJDK16

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

IncrementalInlineVirtual

OpenJDK16

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

IncrementalInline

OpenJDK7

bool

true

product

do post parse inlining

share/opto/c2_globals.hpp

IndexSetWatch

OpenJDK6

intx

0
range(-1, 0)

notproduct

Trace all operations on this IndexSet (-1 means all, 0 none)

share/opto/c2_globals.hpp

InitArrayShortSize

OpenJDK9

intx

aarch64

BytesPerLong

define_pd_global

cpu/aarch64/globals_aarch64.hpp

InitArrayShortSize

OpenJDK9

intx

arm

8*BytesPerLong

define_pd_global

cpu/arm/globals_arm.hpp

InitArrayShortSize

OpenJDK9

intx

runtime

product_pd

DIAGNOSTIC

share/runtime/globals.hpp

InitArrayShortSize

OpenJDK9

intx

ppc

9*BytesPerLong

define_pd_global

cpu/ppc/globals_ppc.hpp

InitArrayShortSize

OpenJDK9

intx

s390

1*BytesPerLong

define_pd_global

cpu/s390/globals_s390.hpp

InitArrayShortSize

OpenJDK9

intx

x86

8*BytesPerLong

define_pd_global

cpu/x86/globals_x86.hpp

InitArrayShortSize

OpenJDK9

intx

zero

define_pd_global

cpu/zero/globals_zero.hpp

InitialCodeCacheSize

OpenJDK6

intx

aarch64

160*K

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

InitialCodeCacheSize

OpenJDK6

size_t

arm

1536*K

define_pd_global

// Integral multiple of CodeCacheExpansionSize

cpu/arm/c2_globals_arm.hpp

InitialCodeCacheSize

OpenJDK6

uintx

compiler

160*K

define_pd_global

share/compiler/compiler_globals_pd.hpp

InitialCodeCacheSize

OpenJDK6

uintx

runtime

product_pd

Initial code cache size (in bytes)

share/runtime/globals.hpp

InitialCodeCacheSize

OpenJDK6

uintx

ppc

160*K

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

InitialCodeCacheSize

OpenJDK6

uintx

s390

2048*K

define_pd_global

// Integral multiple of CodeCacheExpansionSize

cpu/s390/c2_globals_s390.hpp

InitialCodeCacheSize

OpenJDK6

uintx

x86

160*K

define_pd_global

cpu/x86/c1_globals_x86.hpp

InitialHeapSize

OpenJDK6

size_t

product

Initial heap size (in bytes); zero means use ergonomics

share/gc/shared/gc_globals.hpp

InitialRAMFraction

OpenJDK6

Deprecated in JDK10

uintx

64
range(1, max_uintx)

product

Fraction (1/n) of real memory used for initial heap size. Deprecated, use InitialRAMPercentage instead

share/gc/shared/gc_globals.hpp

InitialRAMPercentage

OpenJDK10

double

1.5625
range(0.0, 100.0)

product

Percentage of real memory used for initial heap size

share/gc/shared/gc_globals.hpp

InitialSurvivorRatio

OpenJDK6

uintx

8
range(0, max_uintx)

product

Initial ratio of young generation/survivor space size

share/gc/shared/gc_globals.hpp

InitialTenuringThreshold

OpenJDK6

uintx

7
range(0, markWord::max_age + 1)

product

Initial value for tenuring threshold

share/gc/shared/gc_globals.hpp

InitiatingHeapOccupancyPercent

OpenJDK6

uintx

45
range(0, 100)

product

The percent occupancy (IHOP) of the current old generation capacity above which a concurrent mark cycle will be initiated Its value may change over time if adaptive IHOP is enabled, otherwise the value remains constant. In the latter case a value of 0 will result as frequent as possible concurrent marking cycles. A value of 100 disables concurrent marking. Fragmentation waste in the old generation is not considered free space in this calculation. (G1 collector only)

share/gc/shared/gc_globals.hpp

InjectCompilerCreationFailure

OpenJDK11

bool

runtime

false

develop

Inject thread creation failures for UseDynamicNumberOfCompilerThreads

share/runtime/globals.hpp

InjectGCWorkerCreationFailure

OpenJDK9

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

InlineAccessors

OpenJDK6

bool

true

develop

inline accessor methods (get/set)

share/opto/c2_globals.hpp

InlineArrayCopy

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineClassNatives

OpenJDK6

bool

compiler

true

define_pd_global

share/compiler/compiler_globals_pd.hpp

InlineClassNatives

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineDataFile

OpenJDK8

ccstr

compiler

NULL

product

File containing inlining replay information[default: ./inline_pid%p.log] (%p replaced with pid)

share/compiler/compiler_globals.hpp

InlineFrequencyCount

OpenJDK6

intx

aarch64

100

define_pd_global

cpu/aarch64/globals_aarch64.hpp

InlineFrequencyCount

OpenJDK6

intx

arm

define_pd_global

cpu/arm/globals_arm.hpp

InlineFrequencyCount

OpenJDK6

intx

runtime

product_pd

DIAGNOSTIC

share/runtime/globals.hpp

InlineFrequencyCount

OpenJDK6

intx

ppc

100

define_pd_global

cpu/ppc/globals_ppc.hpp

InlineFrequencyCount

OpenJDK6

intx

s390

100

define_pd_global

cpu/s390/globals_s390.hpp

InlineFrequencyCount

OpenJDK6

intx

x86

100

define_pd_global

cpu/x86/globals_x86.hpp

InlineFrequencyCount

OpenJDK6

intx

zero

100

define_pd_global

cpu/zero/globals_zero.hpp

InlineFrequencyRatio

OpenJDK6

intx

runtime

20
range(0, max_jint)

develop

Ratio of call site execution to caller method invocation

share/runtime/globals.hpp

InlineIntrinsics

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

InlineIntrinsics

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

InlineIntrinsics

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

InlineIntrinsics

OpenJDK6

bool

runtime

develop_pd

Inline intrinsics that can be statically resolved

share/runtime/globals.hpp

InlineIntrinsics

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

InlineIntrinsics

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

InlineIntrinsics

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

InlineMathNatives

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineMethodsWithExceptionHandlers

OpenJDK6

bool

true

develop

Inline methods containing exception handlers (NOTE: does not work with current backend)

share/c1/c1_globals.hpp

InlineNIOCheckIndex

OpenJDK6

bool

true

product

DIAGNOSTIC

share/c1/c1_globals.hpp

InlineNatives

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineObjectCopy

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

InlineObjectHash

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineReflectionGetCallerClass

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

InlineSmallCode

OpenJDK6

intx

aarch64

1000

define_pd_global

cpu/aarch64/globals_aarch64.hpp

InlineSmallCode

OpenJDK6

intx

arm

1500

define_pd_global

cpu/arm/globals_arm.hpp

InlineSmallCode

OpenJDK6

intx

product_pd

Only inline already compiled methods if their code size is less than this

share/opto/c2_globals.hpp

InlineSmallCode

OpenJDK6

intx

ppc

1500

define_pd_global

cpu/ppc/globals_ppc.hpp

InlineSmallCode

OpenJDK6

intx

s390

2000

define_pd_global

cpu/s390/globals_s390.hpp

InlineSmallCode

OpenJDK6

intx

x86

1000

define_pd_global

cpu/x86/globals_x86.hpp

InlineSmallCode

OpenJDK6

intx

zero

1000

define_pd_global

cpu/zero/globals_zero.hpp

InlineSynchronizedMethods

OpenJDK6

bool

true

product

Inline synchronized methods

share/c1/c1_globals.hpp

InlineThreadNatives

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineThrowCount

OpenJDK6

intx

runtime

50
range(0, max_jint)

develop

Force inlining of interpreted methods that throw this often

share/runtime/globals.hpp

InlineThrowMaxSize

OpenJDK6

intx

runtime

200
range(0, max_jint)

develop

Force inlining of throwing methods smaller than this

share/runtime/globals.hpp

InlineUnsafeOps

OpenJDK6

bool

compiler

true

define_pd_global

share/compiler/compiler_globals_pd.hpp

InlineUnsafeOps

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

InlineWarmCalls

OpenJDK6

bool

false

develop

Use a heat-based priority queue to govern inlining

share/opto/c2_globals.hpp

Inline

OpenJDK6

bool

runtime

true

product

Enable inlining

share/runtime/globals.hpp

InstallMethods

OpenJDK6

bool

true

develop

Install methods at the end of successful compilations

share/c1/c1_globals.hpp

InstructionCountCutoff

OpenJDK6

intx

37000
range(0, max_jint)

develop

If GraphBuilder adds this many instructions, bails out

share/c1/c1_globals.hpp

IntelJccErratumMitigation

OpenJDK15

bool

x86

true

product

DIAGNOSTIC

cpu/x86/globals_x86.hpp

InterceptOSException

OpenJDK6

bool

runtime

false

develop

Start debugger when an implicit OS (e.g. NULL) exception happens

share/runtime/globals.hpp

InteriorEntryAlignment

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

InteriorEntryAlignment

OpenJDK6

intx

arm

define_pd_global

// = CodeEntryAlignment

cpu/arm/c2_globals_arm.hpp

InteriorEntryAlignment

OpenJDK6

intx

product_pd

Code alignment for interior entry points in generated code (in bytes)

share/opto/c2_globals.hpp

InteriorEntryAlignment

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

InteriorEntryAlignment

OpenJDK6

intx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

InteriorEntryAlignment

OpenJDK6

intx

x86

define_pd_global

cpu/x86/c2_globals_x86.hpp

InterpreterProfilePercentage

OpenJDK6

intx

compiler

33
range(0, 100)

product

NON_TIERED number of method invocations/branches (expressed as % of CompileThreshold) before profiling in the interpreter

share/compiler/compiler_globals.hpp

JVMCICounterSize

OpenJDK9

intx

jvmci

0
range(0, 1000000)

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCICountersExcludeCompiler

OpenJDK9

bool

jvmci

true

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCIEventLogLevel

OpenJDK16

intx

jvmci

1
range(0, 4)

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCIHostThreads

OpenJDK9

intx

jvmci

1
range(0, max_jint))

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCILibDumpJNIConfig

OpenJDK13

ccstr

jvmci

NULL

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCILibPath

OpenJDK13

ccstr

jvmci

NULL

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCINMethodSizeLimit

OpenJDK9

intx

jvmci

(80*K)*wordSize
range(0, max_jint)

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCIPrintProperties

OpenJDK9

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCIThreads

OpenJDK9

intx

jvmci

1
range(1, max_jint)

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCITraceLevel

OpenJDK9

intx

jvmci

0
range(0, 4)

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

JVMCIUseFastLocking

OpenJDK9

bool

jvmci

true

develop

Use fast inlined locking code

share/jvmci/jvmci_globals.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

aix

ppc

8192

define_pd_global

os_cpu/aix_ppc/globals_aix_ppc.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

bsd

x86

8192

define_pd_global

os_cpu/bsd_x86/globals_bsd_x86.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

bsd

zero

8192

define_pd_global

os_cpu/bsd_zero/globals_bsd_zero.hpp

JVMInvokeMethodSlack

OpenJDK6

uintx

linux

aarch64

8192

define_pd_global

os_cpu/linux_aarch64/globals_linux_aarch64.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

linux

arm

8192

define_pd_global

os_cpu/linux_arm/globals_linux_arm.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

linux

ppc

8192

define_pd_global

os_cpu/linux_ppc/globals_linux_ppc.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

linux

s390

8192

define_pd_global

os_cpu/linux_s390/globals_linux_s390.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

linux

x86

8192

define_pd_global

os_cpu/linux_x86/globals_linux_x86.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

linux

zero

8192

define_pd_global

os_cpu/linux_zero/globals_linux_zero.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

runtime

develop_pd

Stack space (bytes) required for JVM_InvokeMethod to complete

share/runtime/globals.hpp

JVMInvokeMethodSlack

OpenJDK6

uintx

windows

aarch64

8192

define_pd_global

os_cpu/windows_aarch64/globals_windows_aarch64.hpp

JVMInvokeMethodSlack

OpenJDK6

size_t

windows

x86

8192

define_pd_global

os_cpu/windows_x86/globals_windows_x86.hpp

JavaMonitorsInStackTrace

OpenJDK6

bool

runtime

true

product

Print information about Java monitor locks when the stacks are dumped

share/runtime/globals.hpp

JavaPriority10_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority1_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority2_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority3_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority4_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority5_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority6_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority7_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority8_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

JavaPriority9_To_OSPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

Map Java priorities to OS priorities

share/runtime/globals.hpp

LIRTraceExecution

OpenJDK6

bool

false

develop

add LIR code which logs the execution of blocks

share/c1/c1_globals.hpp

LIRTracePeephole

OpenJDK6

bool

false

develop

Trace peephole optimizer

share/c1/c1_globals.hpp

LargePageHeapSizeThreshold

OpenJDK6

size_t

runtime

128*M
range(0, max_uintx)

product

Use large pages if maximum heap is at least this big

share/runtime/globals.hpp

LargePageSizeInBytes

OpenJDK6

size_t

runtime

0
range(0, max_uintx)

product

Large page size (0 to let VM choose the page size)

share/runtime/globals.hpp

LargePagesIndividualAllocationInjectError

OpenJDK6

bool

runtime

false

develop

Fail large pages individual allocation

share/runtime/globals.hpp

LiveNodeCountInliningCutoff

OpenJDK7

intx

40000
range(0, max_juint / 8)

product

max number of live nodes in a method

share/opto/c2_globals.hpp

LoadExecStackDllInVMThread

OpenJDK7

bool

linux

true

product

Load DLLs with executable-stack attribute in the VM Thread

os/linux/globals_linux.hpp

LoadLineNumberTables

OpenJDK6

bool

runtime

true

develop

Tell whether the class file parser loads line number tables

share/runtime/globals.hpp

LoadLocalVariableTables

OpenJDK6

bool

runtime

true

develop

Tell whether the class file parser loads local variable tables

share/runtime/globals.hpp

LoadLocalVariableTypeTables

OpenJDK6

bool

runtime

true

develop

Tell whether the class file parser loads local variable typetables

share/runtime/globals.hpp

LogCompilation

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

LogEventsBufferEntries

OpenJDK6

uintx

runtime

20
range(1, NOT_LP64(1*K) LP64_ONLY(1*M))

product

DIAGNOSTIC

share/runtime/globals.hpp

LogEvents

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

LogFile

OpenJDK6

ccstr

runtime

NULL

product

DIAGNOSTIC

share/runtime/globals.hpp

LogSweeper

OpenJDK6

bool

runtime

false

notproduct

Keep a ring buffer of sweeper activity

share/runtime/globals.hpp

LogTouchedMethods

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

LogVMOutput

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

LoopMaxUnroll

OpenJDK7

intx

16
range(0, max_jint)

product

Maximum number of unrolls for main loop

share/opto/c2_globals.hpp

LoopOptsCount

OpenJDK6

intx

43
range(5, 43)

product

Set level of loop optimization for tier 1 compiles

share/opto/c2_globals.hpp

LoopPercentProfileLimit

OpenJDK9

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

LoopPercentProfileLimit

OpenJDK9

intx

arm

define_pd_global

cpu/arm/c2_globals_arm.hpp

LoopPercentProfileLimit

OpenJDK9

intx

product_pd

Unroll loop bodies with % node count of profile limit

share/opto/c2_globals.hpp

LoopPercentProfileLimit

OpenJDK9

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

LoopPercentProfileLimit

OpenJDK9

intx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

LoopPercentProfileLimit

OpenJDK9

intx

x86

define_pd_global

cpu/x86/c2_globals_x86.hpp

LoopStripMiningIterShortLoop

OpenJDK10

uintx

0
range(0, max_juint)

product

Loop with fewer iterations are not strip mined

share/opto/c2_globals.hpp

LoopStripMiningIter

OpenJDK10

uintx

0
range(0, max_juint)

product

Number of iterations in strip mined loop

share/opto/c2_globals.hpp

LoopUnrollLimit

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

LoopUnrollLimit

OpenJDK6

intx

arm

define_pd_global

// Design center runs on 1.3.1

cpu/arm/c2_globals_arm.hpp

LoopUnrollLimit

OpenJDK6

intx

product_pd

Unroll loop bodies with node count less than this

share/opto/c2_globals.hpp

LoopUnrollLimit

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

LoopUnrollLimit

OpenJDK6

intx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

LoopUnrollLimit

OpenJDK6

intx

x86

define_pd_global

// Design center runs on 1.3.1

cpu/x86/c2_globals_x86.hpp

LoopUnrollMin

OpenJDK6

intx

4
range(0, max_jint)

product

Minimum number of unroll loop bodies before checking progressof rounds of unroll,optimize,..

share/opto/c2_globals.hpp

LoopUnswitching

OpenJDK6

bool

true

product

Enable loop unswitching (a form of invariant test hoisting)

share/opto/c2_globals.hpp

MVCLEThreshold

OpenJDK9

size_t

s390

+2*(4*K)

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

MallocCatchPtr

OpenJDK6

intx

runtime

-1

develop

Hit breakpoint when mallocing/freeing this pointer

share/runtime/globals.hpp

MallocMaxTestWords

OpenJDK8

uintx

runtime

0
range(0, max_uintx)

product

DIAGNOSTIC

share/runtime/globals.hpp

ManagementServer

OpenJDK6

bool

runtime

false

product

Create JMX Management Server

share/runtime/globals.hpp

MarkStackSizeMax

OpenJDK6

size_t

NOT_LP64(4*M) LP64_ONLY(512*M)
range(1, (max_jint - 1))

product

Maximum size of marking stack

share/gc/shared/gc_globals.hpp

MarkStackSize

OpenJDK6

size_t

NOT_LP64(32*K) LP64_ONLY(4*M)
range(1, (max_jint - 1))

product

Size of marking stack

share/gc/shared/gc_globals.hpp

MarkSweepAlwaysCompactCount

OpenJDK6

uint

4
range(1, max_juint)

product

How often should we fully compact the heap (ignoring the dead space parameters)

share/gc/shared/gc_globals.hpp

MarkSweepDeadRatio

OpenJDK6

uintx

5
range(0, 100)

product

Percentage (0-100) of the old gen allowed as dead wood. Serial mark sweep treats this as both the minimum and maximum value. Par compact uses a variable scale based on the density of the generation and treats this as the maximum value when the heap is either completely full or completely empty. Par compact also has a smaller default value; see arguments.cpp.

share/gc/shared/gc_globals.hpp

MaxBCEAEstimateLevel

OpenJDK6

intx

compiler

5
range(0, max_jint)

product

Maximum number of nested calls that are analyzed by BC EA

share/compiler/compiler_globals.hpp

MaxBCEAEstimateSize

OpenJDK6

intx

compiler

150
range(0, max_jint)

product

Maximum bytecode size of a method to be analyzed by BC EA

share/compiler/compiler_globals.hpp

MaxDirectMemorySize

OpenJDK6

uint64_t

runtime

0
range(0, max_jlong)

product

Maximum total size of NIO direct-buffer allocations

share/runtime/globals.hpp

MaxElementPrintSize

OpenJDK6

intx

runtime

256

notproduct

maximum number of elements to print

share/runtime/globals.hpp

MaxExpectedDataSegmentSize

OpenJDK9

uintx

aix

8*G

product

Maximum expected Data Segment Size.

os/aix/globals_aix.hpp

MaxFDLimit

OpenJDK6

bool

runtime

true

product

Bump the number of file descriptors to maximum (Unix only)

share/runtime/globals.hpp

MaxForceInlineLevel

OpenJDK7

intx

runtime

100
range(0, max_jint)

develop

maximum number of nested calls that are forced for inlining (using CompileCommand or marked w/ @ForceInline)

share/runtime/globals.hpp

MaxGCMinorPauseMillis

OpenJDK6

Deprecated in JDK8

uintx

max_uintx
range(0, max_uintx)

product

Adaptive size policy maximum GC minor pause time goal in millisecond

share/gc/shared/gc_globals.hpp

MaxGCPauseMillis

OpenJDK6

uintx

max_uintx - 1
range(1, max_uintx - 1)

product

Adaptive size policy maximum GC pause time goal in millisecond, or (G1 Only) the maximum GC time per MMU time slice

share/gc/shared/gc_globals.hpp

MaxHeapFreeRatio

OpenJDK6

uintx

runtime

70
range(0, 100)

product

MANAGEABLE

share/runtime/globals.hpp

MaxHeapSize

OpenJDK6

size_t

ScaleForWordSize(96*M)

product

Maximum heap size (in bytes)

share/gc/shared/gc_globals.hpp

MaxInlineLevel

OpenJDK6

intx

15
range(0, max_jint)

product

maximum number of nested calls that are inlined by high tier compiler

share/opto/c2_globals.hpp

MaxInlineSize

OpenJDK6

intx

35
range(0, max_jint)

product

The maximum bytecode size of a method to be inlined by high tier compiler

share/opto/c2_globals.hpp

MaxJNILocalCapacity

OpenJDK8

intx

runtime

65536
range(min_intx, max_intx)

product

Maximum allowable local JNI handle capacity to EnsureLocalCapacity() and PushLocalFrame(), where <= 0 is unlimited, default: 65536

share/runtime/globals.hpp

MaxJavaStackTraceDepth

OpenJDK6

intx

runtime

1024
range(0, max_jint/2)

product

The maximum number of lines in the stack trace for Java exceptions (0 means all)

share/runtime/globals.hpp

MaxJumpTableSize

OpenJDK6

intx

65000
range(0, max_intx)

product

Maximum number of targets in a generated jump table

share/opto/c2_globals.hpp

MaxJumpTableSparseness

OpenJDK6

intx

5
range(0, max_intx / 4)

product

Maximum sparseness for jumptables

share/opto/c2_globals.hpp

MaxLabelRootDepth

OpenJDK6

intx

1100
range(100, max_jint)

product

Maximum times call Label_Root to prevent stack overflow

share/opto/c2_globals.hpp

MaxLoopPad

OpenJDK6

intx

(OptoLoopAlignment-1)
range(0, max_jint)

product

Align a loop if padding size in bytes is less or equal to this value

share/opto/c2_globals.hpp

MaxMetaspaceExpansion

OpenJDK8

size_t

runtime

ScaleForWordSize(4*M)
range(0, max_uintx)

product

The maximum expansion of Metaspace without full GC (in bytes)

share/runtime/globals.hpp

MaxMetaspaceFreeRatio

OpenJDK8

uintx

runtime

70
range(0, 100)

product

The maximum percentage of Metaspace free after GC to avoid shrinking

share/runtime/globals.hpp

MaxMetaspaceSize

OpenJDK8

size_t

runtime

max_uintx

product

Maximum size of Metaspaces (in bytes)

share/runtime/globals.hpp

MaxNewSize

OpenJDK6

size_t

max_uintx
range(0, max_uintx)

product

Maximum new generation size (in bytes), max_uintx means set ergonomically

share/gc/shared/gc_globals.hpp

MaxNodeLimit

OpenJDK6

intx

80000
range(1000, max_jint / 3)

product

Maximum number of nodes

share/opto/c2_globals.hpp

MaxRAMFraction

OpenJDK6

Deprecated in JDK10

uintx

4
range(1, max_uintx)

product

Maximum fraction (1/n) of real memory used for maximum heap size. Deprecated, use MaxRAMPercentage instead

share/gc/shared/gc_globals.hpp

MaxRAMPercentage

OpenJDK10

double

25.0
range(0.0, 100.0)

product

Maximum percentage of real memory used for maximum heap size

share/gc/shared/gc_globals.hpp

MaxRAM

OpenJDK6

uint64_t

aarch64

1ULL*G

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

MaxRAM

OpenJDK6

uint64_t

arm

4ULL*G

define_pd_global

cpu/arm/c2_globals_arm.hpp

MaxRAM

OpenJDK6

uint64_t

compiler

1ULL*G

define_pd_global

share/compiler/compiler_globals_pd.hpp

MaxRAM

OpenJDK6

uint64_t

product_pd

Real memory size (in bytes) used to set maximum heap size

share/gc/shared/gc_globals.hpp

MaxRAM

OpenJDK6

uint64_t

ppc

1ULL*G

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

MaxRAM

OpenJDK6

uint64_t

s390

128ULL*G

define_pd_global

cpu/s390/c2_globals_s390.hpp

MaxRAM

OpenJDK6

uint64_t

x86

1ULL*G

define_pd_global

cpu/x86/c1_globals_x86.hpp

MaxRecursiveInlineLevel

OpenJDK6

intx

1
range(0, max_jint)

product

maximum number of nested recursive calls that are inlined by high tier compiler

share/opto/c2_globals.hpp

MaxSubklassPrintSize

OpenJDK6

intx

runtime

notproduct

maximum number of subklasses to print when printing klass

share/runtime/globals.hpp

MaxTenuringThreshold

OpenJDK6

uintx

15
range(0, markWord::max_age + 1)

product

Maximum value for tenuring threshold

share/gc/shared/gc_globals.hpp

MaxTrivialSize

OpenJDK6

intx

6
range(0, max_jint)

product

The maximum bytecode size of a trivial method to be inlined by high tier compiler

share/opto/c2_globals.hpp

MaxVectorSize

OpenJDK7

intx

64
range(0, max_jint)

product

Max vector size in bytes, actual size could be less depending on elements type

share/opto/c2_globals.hpp

MaxVirtMemFraction

OpenJDK7

uintx

develop

Maximum fraction (1/n) of virtual memory used for ergonomically determining maximum heap size

share/gc/shared/gc_globals.hpp

MemProfilingInterval

OpenJDK6

intx

runtime

500

notproduct

Time between each invocation of the MemProfiler

share/runtime/globals.hpp

MemProfiling

OpenJDK6

bool

runtime

false

develop

Write memory usage profiling to log file

share/runtime/globals.hpp

MetadataAllocationFailALotInterval

OpenJDK8

uintx

1000

develop

Metadata allocation failure a lot interval

share/gc/shared/gc_globals.hpp

MetadataAllocationFailALot

OpenJDK8

bool

false

develop

Fail metadata allocations at intervals controlled by MetadataAllocationFailALotInterval

share/gc/shared/gc_globals.hpp

MetaspaceGuardAllocations

OpenJDK16

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

MetaspaceHandleDeallocations

OpenJDK16

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

MetaspaceReclaimPolicy

OpenJDK16

ccstr

runtime

balanced

product

options: balanced, aggressive, none

share/runtime/globals.hpp

MetaspaceSize

OpenJDK8

uintx

aarch64

12*M

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

MetaspaceSize

OpenJDK8

size_t

arm

ScaleForWordSize(16*M)

define_pd_global

cpu/arm/c2_globals_arm.hpp

MetaspaceSize

OpenJDK8

size_t

compiler

ScaleForWordSize(4*M)

define_pd_global

share/compiler/compiler_globals_pd.hpp

MetaspaceSize

OpenJDK8

size_t

runtime

product_pd

Initial threshold (in bytes) at which a garbage collection is done to reduce Metaspace usage

share/runtime/globals.hpp

MetaspaceSize

OpenJDK8

size_t

ppc

12*M

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

MetaspaceSize

OpenJDK8

size_t

s390

ScaleForWordSize(16*M)

define_pd_global

cpu/s390/c2_globals_s390.hpp

MetaspaceSize

OpenJDK8

size_t

x86

12*M

define_pd_global

cpu/x86/c1_globals_x86.hpp

MethodFlushing

OpenJDK6

bool

runtime

true

product

Reclamation of zombie and not-entrant methods

share/runtime/globals.hpp

MethodHistogramCutoff

OpenJDK6

intx

runtime

100

develop

The cutoff value for method invocation histogram (+CountCalls)

share/runtime/globals.hpp

MinHeapDeltaBytes

OpenJDK6

size_t

runtime

ScaleForWordSize(128*K)
range(0, max_uintx)

product

The minimum change in heap space due to GC (in bytes)

share/runtime/globals.hpp

MinHeapFreeRatio

OpenJDK6

uintx

runtime

40
range(0, 100)

product

MANAGEABLE

share/runtime/globals.hpp

MinHeapSize

OpenJDK13

size_t

product

Minimum heap size (in bytes); zero means use ergonomics

share/gc/shared/gc_globals.hpp

MinInliningThreshold

OpenJDK6

intx

runtime

250
range(0, max_jint)

product

The minimum invocation count a method needs to have to be inlined

share/runtime/globals.hpp

MinJumpTableSize

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

MinJumpTableSize

OpenJDK6

intx

arm

define_pd_global

cpu/arm/c2_globals_arm.hpp

MinJumpTableSize

OpenJDK6

intx

product_pd

Minimum number of targets in a generated jump table

share/opto/c2_globals.hpp

MinJumpTableSize

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

MinJumpTableSize

OpenJDK6

intx

s390

define_pd_global

cpu/s390/c2_globals_s390.hpp

MinJumpTableSize

OpenJDK6

intx

x86

define_pd_global

cpu/x86/c2_globals_x86.hpp

MinMetaspaceExpansion

OpenJDK8

size_t

runtime

ScaleForWordSize(256*K)
range(0, max_uintx)

product

The minimum expansion of Metaspace (in bytes)

share/runtime/globals.hpp

MinMetaspaceFreeRatio

OpenJDK8

uintx

runtime

40
range(0, 99)

product

The minimum percentage of Metaspace free after GC to avoid expansion

share/runtime/globals.hpp

MinOopMapAllocation

OpenJDK6

intx

runtime

develop

Minimum number of OopMap entries in an OopMapSet

share/runtime/globals.hpp

MinPassesBeforeFlush

OpenJDK9

intx

runtime

10
range(0, max_intx)

product

DIAGNOSTIC

share/runtime/globals.hpp

MinRAMFraction

OpenJDK6

Deprecated in JDK10

uintx

2
range(1, max_uintx)

product

Minimum fraction (1/n) of real memory used for maximum heap size on systems with small physical memory size. Deprecated, use MinRAMPercentage instead

share/gc/shared/gc_globals.hpp

MinRAMPercentage

OpenJDK10

double

50.0
range(0.0, 100.0)

product

Minimum percentage of real memory used for maximum heapsize on systems with small physical memory size

share/gc/shared/gc_globals.hpp

MinSurvivorRatio

OpenJDK6

uintx

3
range(3, max_uintx)

product

Minimum ratio of young generation/survivor space size

share/gc/shared/gc_globals.hpp

MinTLABSize

OpenJDK6

size_t

2*K
range(1, max_uintx/2)

product

Minimum allowed TLAB size (in bytes)

share/gc/shared/tlab_globals.hpp

MonitorDeflationMax

OpenJDK16

intx

runtime

1000000
range(1024, max_jint)

product

DIAGNOSTIC

share/runtime/globals.hpp

MonitorUsedDeflationThreshold

OpenJDK10

intx

runtime

90
range(0, 100)

product

EXPERIMENTAL

share/runtime/globals.hpp

MonomorphicArrayCheck

OpenJDK6

bool

true

develop

Uncommon-trap array store checks that require full type check

share/opto/c2_globals.hpp

MultiArrayExpandLimit

OpenJDK6

intx

6
range(0, max_jint)

product

Maximum number of individual allocations in an inline-expanded multianewarray instruction

share/opto/c2_globals.hpp

NMethodSizeLimit

OpenJDK6

intx

(64*K)*wordSize
range(0, max_jint)

develop

Maximum size of a compiled method.

share/c1/c1_globals.hpp

NUMAChunkResizeWeight

OpenJDK6

uintx

runtime

20
range(0, 100)

product

Percentage (0-100) used to weight the current sample when computing exponentially decaying average for AdaptiveNUMAChunkSizing

share/runtime/globals.hpp

NUMAInterleaveGranularity

OpenJDK6

size_t

runtime

2*M

product

Granularity to use for NUMA interleaving on Windows OS

share/runtime/globals.hpp

NUMAPageScanRate

OpenJDK6

uintx

runtime

256
range(0, max_uintx)

product

Maximum number of pages to include in the page scan procedure

share/runtime/globals.hpp

NUMASpaceResizeRate

OpenJDK6

size_t

runtime

1*G
range(0, max_uintx)

product

Do not reallocate more than this amount per collection

share/runtime/globals.hpp

NUMAStats

OpenJDK6

bool

runtime

false

product

Print NUMA stats in detailed heap information

share/runtime/globals.hpp

NativeMemoryTracking

OpenJDK7

ccstr

runtime

off

product

Native memory tracking options

share/runtime/globals.hpp

NearCpool

OpenJDK9

bool

aarch64

true

product

constant pool is close to instructions

cpu/aarch64/globals_aarch64.hpp

NestedInliningSizeRatio

OpenJDK6

intx

90
range(0, 100)

develop

Percentage of prev. allowed inline size in recursive inlining

share/c1/c1_globals.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

compiler

true

define_pd_global

share/compiler/compiler_globals_pd.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

product_pd

Never act like a server-class machine

share/gc/shared/gc_globals.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

NeverActAsServerClassMachine

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

NeverTenure

OpenJDK6

bool

false

product

Never tenure objects in eden, may tenure on overflow (ParallelGC only)

share/gc/shared/gc_globals.hpp

NewCodeParameter

OpenJDK6

intx

runtime

develop

Testing Only: Create a dedicated integer parameter before putback

share/runtime/globals.hpp

NewRatio

OpenJDK6

uintx

2
range(0, max_uintx-1)

product

Ratio of old/new generation sizes

share/gc/shared/gc_globals.hpp

NewSizeThreadIncrease

OpenJDK6

intx

aarch64

4*K

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

NewSizeThreadIncrease

OpenJDK6

size_t

arm

ScaleForWordSize(4*K)

define_pd_global

cpu/arm/c2_globals_arm.hpp

NewSizeThreadIncrease

OpenJDK6

size_t

compiler

4*K

define_pd_global

share/compiler/compiler_globals_pd.hpp

NewSizeThreadIncrease

OpenJDK6

size_t

product_pd

Additional size added to desired new generation size per non-daemon thread (in bytes)

share/gc/shared/gc_globals.hpp

NewSizeThreadIncrease

OpenJDK6

size_t

ppc

16*K

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

NewSizeThreadIncrease

OpenJDK6

size_t

s390

ScaleForWordSize(4*K)

define_pd_global

cpu/s390/c2_globals_s390.hpp

NewSizeThreadIncrease

OpenJDK6

size_t

x86

4*K

define_pd_global

cpu/x86/c1_globals_x86.hpp

NewSize

OpenJDK6

size_t

ScaleForWordSize(1*M)

product

Initial new generation size (in bytes)

share/gc/shared/gc_globals.hpp

NmethodSweepActivity

OpenJDK8

intx

runtime

10
range(0, 2000)

product

Removes cold nmethods from code cache if > 0. Higher values result in more aggressive sweeping

share/runtime/globals.hpp

NoAsyncDeflationProgressMax

OpenJDK17

uintx

runtime

3
range(0, max_uintx)

product

DIAGNOSTIC

share/runtime/globals.hpp

NodeCountInliningCutoff

OpenJDK6

intx

18000
range(0, max_jint)

develop

If parser node generation exceeds limit stop inlining

share/opto/c2_globals.hpp

NodeCountInliningStep

OpenJDK6

intx

1000
range(0, max_jint)

develop

Target size of warm calls inlined between optimization passes

share/opto/c2_globals.hpp

NodeLimitFudgeFactor

OpenJDK6

intx

2000

product

Fudge Factor for certain optimizations

share/opto/c2_globals.hpp

NonNMethodCodeHeapSize

OpenJDK9

intx

aarch64

5*M

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

NonNMethodCodeHeapSize

OpenJDK9

size_t

arm

5*M

define_pd_global

cpu/arm/c2_globals_arm.hpp

NonNMethodCodeHeapSize

OpenJDK9

uintx

compiler

32*M

define_pd_global

share/compiler/compiler_globals_pd.hpp

NonNMethodCodeHeapSize

OpenJDK9

uintx

runtime

product_pd

Size of code heap with non-nmethods (in bytes)

share/runtime/globals.hpp

NonNMethodCodeHeapSize

OpenJDK9

uintx

ppc

5*M

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

NonNMethodCodeHeapSize

OpenJDK9

uintx

s390

5*M

define_pd_global

cpu/s390/c2_globals_s390.hpp

NonNMethodCodeHeapSize

OpenJDK9

uintx

x86

5*M

define_pd_global

cpu/x86/c1_globals_x86.hpp

NonProfiledCodeHeapSize

OpenJDK9

intx

aarch64

13*M

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

NonProfiledCodeHeapSize

OpenJDK9

size_t

arm

13*M

define_pd_global

cpu/arm/c2_globals_arm.hpp

NonProfiledCodeHeapSize

OpenJDK9

uintx

compiler

define_pd_global

share/compiler/compiler_globals_pd.hpp

NonProfiledCodeHeapSize

OpenJDK9

uintx

runtime

product_pd

Size of code heap with non-profiled methods (in bytes)

share/runtime/globals.hpp

NonProfiledCodeHeapSize

OpenJDK9

uintx

ppc

13*M

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

NonProfiledCodeHeapSize

OpenJDK9

uintx

s390

21*M

define_pd_global

cpu/s390/c2_globals_s390.hpp

NonProfiledCodeHeapSize

OpenJDK9

uintx

x86

13*M

define_pd_global

cpu/x86/c1_globals_x86.hpp

NumberOfLoopInstrToAlign

OpenJDK6

intx

4
range(0, max_jint)

product

Number of first instructions in a loop to align

share/opto/c2_globals.hpp

OSROnlyBCI

OpenJDK6

intx

compiler

-1

develop

OSR only at this bci. Negative values mean exclude that bci

share/compiler/compiler_globals.hpp

ObjArrayMarkingStride

OpenJDK6

uintx

2048

develop

Number of object array elements to push onto the marking stack before pushing a continuation entry

share/gc/shared/gc_globals.hpp

ObjectAlignmentInBytes

OpenJDK6

intx

runtime

8
range(8, 256)

product

Default object alignment in bytes, 8 is minimum

share/runtime/globals.hpp

ObjectCountCutOffPercent

OpenJDK7

double

runtime

0.5
range(0.0, 100.0)

product

EXPERIMENTAL

share/runtime/globals.hpp

OldPLABSize

OpenJDK6

size_t

1024

product

Size of old gen promotion LAB's (in HeapWords)

share/gc/shared/tlab_globals.hpp

OldSize

OpenJDK6

size_t

ScaleForWordSize(4*M)
range(0, max_uintx)

product

Initial tenured generation size (in bytes)

share/gc/shared/gc_globals.hpp

OmitStackTraceInFastThrow

OpenJDK6

bool

runtime

true

product

Omit backtraces for some 'hot' exceptions in optimized code

share/runtime/globals.hpp

OnError

OpenJDK6

ccstrlist

runtime

Run user-defined commands on fatal error; see VMError.cpp for examples

product

share/runtime/globals.hpp

OnOutOfMemoryError

OpenJDK6

ccstrlist

runtime

Run user-defined commands on first java.lang.OutOfMemoryError thrown from JVM

product

share/runtime/globals.hpp

OnStackReplacePercentage

OpenJDK6

intx

aarch64

933

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

OnStackReplacePercentage

OpenJDK6

intx

arm

140

define_pd_global

cpu/arm/c2_globals_arm.hpp

OnStackReplacePercentage

OpenJDK6

intx

compiler

product_pd

NON_TIERED number of method invocations/branches (expressed as % of CompileThreshold) before (re-)compiling OSR code

share/compiler/compiler_globals.hpp

OnStackReplacePercentage

OpenJDK6

intx

ppc

1400

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

OnStackReplacePercentage

OpenJDK6

intx

s390

140

define_pd_global

cpu/s390/c2_globals_s390.hpp

OnStackReplacePercentage

OpenJDK6

intx

x86

933

define_pd_global

cpu/x86/c1_globals_x86.hpp

OptimizeExpensiveOps

OpenJDK7

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

OptimizeFill

OpenJDK6

bool

true PPC64_ONLY(&& false)

product

convert fill/copy loops into intrinsic

share/opto/c2_globals.hpp

OptimizeIfOps

OpenJDK6

bool

true

develop

Optimize multiple IfOps

share/c1/c1_globals.hpp

OptimizePollingPageLocation

OpenJDK7

bool

aix

true

product

Optimize the location of the polling page used for Safepoints

os/aix/globals_aix.hpp

OptimizePtrCompare

OpenJDK6

bool

true

product

Use escape analysis to optimize pointers compare

share/opto/c2_globals.hpp

OptimizeSinglePrecision

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

OptimizeSinglePrecision

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c1_globals_arm.hpp

OptimizeSinglePrecision

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

OptimizeSinglePrecision

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c1_globals_s390.hpp

OptimizeSinglePrecision

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

OptimizeStringConcat

OpenJDK6

bool

true

product

Optimize the construction of Strings by StringBuilder

share/opto/c2_globals.hpp

OptimizeUnsafes

OpenJDK6

bool

true

develop

Optimize raw unsafe ops

share/c1/c1_globals.hpp

OptoBlockListSize

OpenJDK6

intx

8
range(1, max_jint)

develop

Starting allocation size of Block_List data structures

share/opto/c2_globals.hpp

OptoBreakpointC2R

OpenJDK6

bool

false

notproduct

insert breakpoint at runtime stub entry

share/opto/c2_globals.hpp

OptoBreakpointOSR

OpenJDK6

bool

false

notproduct

insert breakpoint at osr method entry

share/opto/c2_globals.hpp

OptoBreakpoint

OpenJDK6

bool

false

develop

insert breakpoint at method entry

share/opto/c2_globals.hpp

OptoBundling

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

OptoBundling

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

OptoBundling

OpenJDK6

bool

product_pd

Generate nops to fill i-cache lines

share/opto/c2_globals.hpp

OptoBundling

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

OptoBundling

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

OptoBundling

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c2_globals_x86.hpp

OptoCoalesce

OpenJDK6

bool

true

develop

Use Conservative Copy Coalescing in the Register Allocator

share/opto/c2_globals.hpp

OptoLoopAlignment

OpenJDK6

intx

aarch64

define_pd_global

cpu/aarch64/globals_aarch64.hpp

OptoLoopAlignment

OpenJDK6

intx

arm

define_pd_global

cpu/arm/globals_arm.hpp

OptoLoopAlignment

OpenJDK6

intx

runtime

product_pd

Align inner loops to zero relative to this modulus

share/runtime/globals.hpp

OptoLoopAlignment

OpenJDK6

intx

ppc

define_pd_global

cpu/ppc/globals_ppc.hpp

OptoLoopAlignment

OpenJDK6

intx

s390

define_pd_global

cpu/s390/globals_s390.hpp

OptoLoopAlignment

OpenJDK6

intx

x86

define_pd_global

cpu/x86/globals_x86.hpp

OptoLoopAlignment

OpenJDK6

intx

zero

define_pd_global

cpu/zero/globals_zero.hpp

OptoNoExecute

OpenJDK6

bool

false

notproduct

Attempt to parse and compile but do not execute generated code

share/opto/c2_globals.hpp

OptoNodeListSize

OpenJDK6

intx

4
range(1, max_jint)

develop

Starting allocation size of Node_List data structures

share/opto/c2_globals.hpp

OptoPeepholeAt

OpenJDK6

intx

-1

develop

Apply peephole optimizations to this peephole rule

share/opto/c2_globals.hpp

OptoPeephole

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

OptoPeephole

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

OptoPeephole

OpenJDK6

bool

develop_pd

Apply peephole optimizations after register allocation

share/opto/c2_globals.hpp

OptoPeephole

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

OptoPeephole

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

OptoPeephole

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c2_globals_x86.hpp

OptoPrologueNops

OpenJDK6

intx

0
range(0, 128)

develop

Insert this many extra nop instructions in the prologue of every nmethod

share/opto/c2_globals.hpp

OptoRegScheduling

OpenJDK9

bool

aarch64

false

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

OptoRegScheduling

OpenJDK9

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

OptoRegScheduling

OpenJDK9

bool

product_pd

Instruction Scheduling before register allocation for pressure

share/opto/c2_globals.hpp

OptoRegScheduling

OpenJDK9

bool

ppc

false

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

OptoRegScheduling

OpenJDK9

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

OptoRegScheduling

OpenJDK9

bool

x86

true

define_pd_global

cpu/x86/c2_globals_x86.hpp

OptoRemoveUseless

OpenJDK6

bool

true

develop

Remove useless nodes after parsing

share/opto/c2_globals.hpp

OptoScheduling

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

OptoScheduling

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

OptoScheduling

OpenJDK6

bool

product_pd

Instruction Scheduling after register allocation

share/opto/c2_globals.hpp

OptoScheduling

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

OptoScheduling

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

OptoScheduling

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c2_globals_x86.hpp

PLABWeight

OpenJDK6

uintx

75
range(0, 100)

product

Percentage (0-100) used to weight the current sample when computing exponentially decaying average for ResizePLAB

share/gc/shared/gc_globals.hpp

PSAdaptiveSizePolicyResizeVirtualSpaceAlot

OpenJDK6

intx

-1
range(-1, 1)

develop

Resize the virtual spaces of the young or old generations

share/gc/shared/gc_globals.hpp

PSChunkLargeArrays

OpenJDK6

bool

true

product

Process large arrays in chunks

share/gc/parallel/parallel_globals.hpp

ParGCArrayScanChunk

OpenJDK6

int

50
range(1, max_jint/3)

product

Scan a subset of object array and push remainder, if array is bigger than this

share/gc/shared/gc_globals.hpp

ParallelGCBufferWastePct

OpenJDK6

uintx

10
range(0, 100)

product

Wasted fraction of parallel allocation buffer

share/gc/shared/gc_globals.hpp

ParallelGCThreads

OpenJDK6

uint

product

Number of parallel threads parallel gc will use

share/gc/shared/gc_globals.hpp

ParallelOldDeadWoodLimiterMean

OpenJDK6

size_t

50
range(0, 100)

product

The mean used by the parallel compact dead wood limiter (a number between 0-100)

share/gc/parallel/parallel_globals.hpp

ParallelOldDeadWoodLimiterStdDev

OpenJDK6

size_t

80
range(0, 100)

product

The standard deviation used by the parallel compact dead wood limiter (a number between 0-100)

share/gc/parallel/parallel_globals.hpp

ParallelRefProcBalancingEnabled

OpenJDK6

bool

true

product

Enable balancing of reference processing queues

share/gc/shared/gc_globals.hpp

ParallelRefProcEnabled

OpenJDK6

bool

false

product

Enable parallel reference processing whenever possible

share/gc/shared/gc_globals.hpp

PartialPeelAtUnsignedTests

OpenJDK6

bool

true

product

Partial peel at unsigned tests if no signed test exists

share/opto/c2_globals.hpp

PartialPeelLoop

OpenJDK6

bool

true

product

Partial peel (rotate) loops

share/opto/c2_globals.hpp

PartialPeelNewPhiDelta

OpenJDK6

intx

0
range(0, max_jint)

product

Additional phis that can be created by partial peeling

share/opto/c2_globals.hpp

PatchALot

OpenJDK6

bool

false

develop

Marks all fields as having unloaded classes

share/c1/c1_globals.hpp

PauseAtExit

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PauseAtStartupFile

OpenJDK6

ccstr

runtime

NULL

product

DIAGNOSTIC

share/runtime/globals.hpp

PauseAtStartup

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PausePadding

OpenJDK6

uintx

1
range(0, max_juint)

product

How much buffer to keep for pause time

share/gc/shared/gc_globals.hpp

PerBytecodeRecompilationCutoff

OpenJDK6

intx

runtime

200
range(-1, max_intx)

product

Per-BCI limit on repeated recompilation (-1=>'Inf')

share/runtime/globals.hpp

PerBytecodeTrapLimit

OpenJDK6

intx

runtime

4
range(0, max_jint)

product

Limit on traps (of one kind) at a particular BCI

share/runtime/globals.hpp

PerMethodRecompilationCutoff

OpenJDK6

intx

runtime

400
range(-1, max_intx)

product

After recompiling N times, stay in the interpreter (-1=>'Inf')

share/runtime/globals.hpp

PerMethodSpecTrapLimit

OpenJDK8

intx

runtime

5000
range(0, max_jint)

product

EXPERIMENTAL

share/runtime/globals.hpp

PerMethodTrapLimit

OpenJDK6

intx

runtime

100
range(0, max_jint)

product

Limit on traps (of one kind) in a method (includes inlines)

share/runtime/globals.hpp

PerfAllowAtExitRegistration

OpenJDK6

bool

runtime

false

product

Allow registration of atexit() methods

share/runtime/globals.hpp

PerfBypassFileSystemCheck

OpenJDK6

bool

runtime

false

product

Bypass Win32 file system criteria checks (Windows Only)

share/runtime/globals.hpp

PerfDataMemorySize

OpenJDK6

intx

runtime

32*K
range(128, 32*64*K)

product

Size of performance data memory region. Will be rounded up to a multiple of the native os page size.

share/runtime/globals.hpp

PerfDataSamplingInterval

OpenJDK6

intx

runtime

50
range(PeriodicTask::min_interval, max_jint)

product

Data sampling interval (in milliseconds)

share/runtime/globals.hpp

PerfDataSaveFile

OpenJDK6

ccstr

runtime

NULL

product

Save PerfData memory to the specified absolute pathname. The string %p in the file name (if present) will be replaced by pid

share/runtime/globals.hpp

PerfDataSaveToFile

OpenJDK6

bool

runtime

false

product

Save PerfData memory to hsperfdata_<pid> file on exit

share/runtime/globals.hpp

PerfDisableSharedMem

OpenJDK6

bool

runtime

false

product

Store performance data in standard memory

share/runtime/globals.hpp

PerfMaxStringConstLength

OpenJDK6

intx

runtime

1024
range(32, 32*K)

product

Maximum PerfStringConstant string length before truncation

share/runtime/globals.hpp

PinAllInstructions

OpenJDK6

bool

false

develop

All instructions are pinned

share/c1/c1_globals.hpp

PoisonOSREntry

OpenJDK6

bool

true

develop

Detect abnormal calls to OSR code

share/opto/c2_globals.hpp

PostLoopMultiversioning

OpenJDK9

bool

false

product

EXPERIMENTAL

share/opto/c2_globals.hpp

PowerArchitecturePPC64

OpenJDK7

uintx

ppc

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

PreTouchParallelChunkSize

OpenJDK9

size_t

aix

1 * G

define_pd_global

os/aix/globals_aix.hpp

PreTouchParallelChunkSize

OpenJDK9

size_t

bsd

1 * G

define_pd_global

os/bsd/globals_bsd.hpp

PreTouchParallelChunkSize

OpenJDK9

size_t

linux

4 * M

define_pd_global

os/linux/globals_linux.hpp

PreTouchParallelChunkSize

OpenJDK9

size_t

product_pd

Per-thread chunk size for parallel memory pre-touch.

share/gc/shared/gc_globals.hpp

PreTouchParallelChunkSize

OpenJDK9

size_t

windows

1 * G

define_pd_global

os/windows/globals_windows.hpp

PreallocatedOutOfMemoryErrorCount

OpenJDK6

uintx

runtime

develop

Number of OutOfMemoryErrors preallocated with backtrace

share/runtime/globals.hpp

PreferContainerQuotaForCPUCount

OpenJDK11

bool

linux

true

product

Calculate the container CPU availability based on the value of quotas (if set), when true. Otherwise, use the CPU shares value, provided it is less than quota.

os/linux/globals_linux.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

compiler

true

define_pd_global

share/compiler/compiler_globals_pd.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

runtime

product_pd

Use always interpreter stubs for native methods invoked via interpreter

share/runtime/globals.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

PreferInterpreterNativeStubs

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c1_globals_x86.hpp

PreferLAoverADD

OpenJDK9

bool

s390

false

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

PrefetchCopyIntervalInBytes

OpenJDK6

intx

-1
range(-1, max_jint)

product

How far ahead to prefetch destination area (<= 0 means off)

share/gc/shared/gc_globals.hpp

PrefetchFieldsAhead

OpenJDK6

intx

-1
range(-1, max_jint)

product

How many fields ahead to prefetch in oop scan (<= 0 means off)

share/gc/shared/gc_globals.hpp

PrefetchScanIntervalInBytes

OpenJDK6

intx

-1
range(-1, max_jint)

product

How far ahead to prefetch scan area (<= 0 means off)

share/gc/shared/gc_globals.hpp

PreserveAllAnnotations

OpenJDK6

bool

runtime

false

product

Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations

share/runtime/globals.hpp

PreserveFramePointer

OpenJDK8

bool

aarch64

false

define_pd_global

cpu/aarch64/globals_aarch64.hpp

PreserveFramePointer

OpenJDK8

bool

arm

false

define_pd_global

cpu/arm/globals_arm.hpp

PreserveFramePointer

OpenJDK8

bool

runtime

product_pd

Use the FP register for holding the frame pointer and not as a general purpose register.

share/runtime/globals.hpp

PreserveFramePointer

OpenJDK8

bool

ppc

false

define_pd_global

cpu/ppc/globals_ppc.hpp

PreserveFramePointer

OpenJDK8

bool

s390

false

define_pd_global

cpu/s390/globals_s390.hpp

PreserveFramePointer

OpenJDK8

bool

x86

false

define_pd_global

cpu/x86/globals_x86.hpp

PreserveFramePointer

OpenJDK8

bool

zero

false

define_pd_global

cpu/zero/globals_zero.hpp

PretenureSizeThreshold

OpenJDK6

size_t

0
range(0, max_uintx)

product

Maximum size in bytes of objects allocated in DefNew generation; zero means no maximum

share/gc/shared/gc_globals.hpp

PrintAOTStatistics

OpenJDK9

bool

runtime

false

notproduct

Print AOT statistics

share/runtime/globals.hpp

PrintAOT

OpenJDK9

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

PrintAdapterHandlers

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintAssemblyOptions

OpenJDK6

ccstr

runtime

NULL

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintAssembly

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintBailouts

OpenJDK6

bool

false

develop

Print bailout and its reason

share/c1/c1_globals.hpp

PrintBiasedLockingStatistics

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintBlockElimination

OpenJDK6

bool

false

develop

Print basic block elimination

share/c1/c1_globals.hpp

PrintBootstrap

OpenJDK9

bool

jvmci

true

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

PrintBytecodeHistogram

OpenJDK6

bool

runtime

false

develop

Print histogram of the executed bytecodes

share/runtime/globals.hpp

PrintBytecodePairHistogram

OpenJDK6

bool

runtime

false

develop

Print histogram of the executed bytecode pairs

share/runtime/globals.hpp

PrintC1Statistics

OpenJDK6

bool

false

notproduct

Print Compiler1 statistics

share/c1/c1_globals.hpp

PrintCEE

OpenJDK6

bool

false

develop

Print Conditional Expression Elimination

share/c1/c1_globals.hpp

PrintCFG0

OpenJDK6

bool

false

notproduct

Print control flow graph after construction

share/c1/c1_globals.hpp

PrintCFG1

OpenJDK6

bool

false

notproduct

Print control flow graph after optimizations

share/c1/c1_globals.hpp

PrintCFG2

OpenJDK6

bool

false

notproduct

Print control flow graph before code generation

share/c1/c1_globals.hpp

PrintCFGBlockFreq

OpenJDK6

bool

false

develop

Print CFG block freqencies

share/opto/c2_globals.hpp

PrintCFGToFile

OpenJDK6

bool

false

develop

print control flow graph to a separate file during compilation

share/c1/c1_globals.hpp

PrintCFG

OpenJDK6

bool

false

notproduct

Print control flow graph after each change

share/c1/c1_globals.hpp

PrintCanonicalization

OpenJDK6

bool

false

develop

Print graph node canonicalization

share/c1/c1_globals.hpp

PrintClassHistogram

OpenJDK6

bool

runtime

false

product

MANAGEABLE

share/runtime/globals.hpp

PrintCodeCache2

OpenJDK6

bool

runtime

false

develop

Print detailed usage information on the code cache when exiting

share/runtime/globals.hpp

PrintCodeCacheExtension

OpenJDK6

bool

runtime

false

develop

Print extension of code cache

share/runtime/globals.hpp

PrintCodeCacheOnCompilation

OpenJDK8

bool

runtime

false

product

Print the code cache memory usage each time a method is compiled

share/runtime/globals.hpp

PrintCodeCache

OpenJDK6

bool

runtime

false

product

Print the code cache memory usage when exiting

share/runtime/globals.hpp

PrintCodeHeapAnalytics

OpenJDK12

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintCommandLineFlags

OpenJDK6

bool

runtime

false

product

Print flags specified on command line or set by ergonomics

share/runtime/globals.hpp

PrintCompilation2

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintCompilation

OpenJDK6

bool

runtime

false

product

Print compilations

share/runtime/globals.hpp

PrintConcurrentLocks

OpenJDK6

bool

runtime

false

product

MANAGEABLE

share/runtime/globals.hpp

PrintDebugInfo

OpenJDK6

bool

runtime

false

develop

Print debug information for all nmethods when generated

share/runtime/globals.hpp

PrintDeoptimizationDetails

OpenJDK9

bool

runtime

false

develop

Print more information about deoptimization

share/runtime/globals.hpp

PrintDependencies

OpenJDK6

bool

runtime

false

develop

Print dependency information for all nmethods when generated

share/runtime/globals.hpp

PrintDominators

OpenJDK6

bool

false

develop

Print out dominator trees for GVN

share/opto/c2_globals.hpp

PrintEliminateAllocations

OpenJDK6

bool

false

notproduct

Print out when allocations are eliminated

share/opto/c2_globals.hpp

PrintEliminateLocks

OpenJDK6

bool

false

notproduct

Print out when locks are eliminated

share/opto/c2_globals.hpp

PrintEscapeAnalysis

OpenJDK6

bool

false

notproduct

Print the results of escape analysis

share/opto/c2_globals.hpp

PrintExceptionHandlers

OpenJDK6

bool

runtime

false

develop

Print exception handler tables for all nmethods when generated

share/runtime/globals.hpp

PrintExtendedThreadInfo

OpenJDK11

bool

runtime

false

product

Print more information in thread dump

share/runtime/globals.hpp

PrintFieldLayout

OpenJDK8

bool

runtime

false

notproduct

Print field layout for each class

share/runtime/globals.hpp

PrintFlagsFinal

OpenJDK6

bool

runtime

false

product

Print all VM flags after argument and ergonomic processing

share/runtime/globals.hpp

PrintFlagsInitial

OpenJDK6

bool

runtime

false

product

Print all VM flags before argument processing and exit VM

share/runtime/globals.hpp

PrintFlagsRanges

OpenJDK9

bool

runtime

false

product

Print VM flags and their ranges

share/runtime/globals.hpp

PrintFlagsWithComments

OpenJDK6

bool

runtime

false

notproduct

Print all VM flags with default values and descriptions and exit

share/runtime/globals.hpp

PrintFrameConverterAssembly

OpenJDK6

bool

false

notproduct

Print New compiler assembly output for frame converters

share/opto/c2_globals.hpp

PrintGCDetails

OpenJDK6

bool

false

product

Print more details at garbage collection. Deprecated, use -Xlog:gc* instead.

share/gc/shared/gc_globals.hpp

PrintGC

OpenJDK6

bool

false

product

Print message at garbage collection. Deprecated, use -Xlog:gc instead.

share/gc/shared/gc_globals.hpp

PrintHeapAtSIGBREAK

OpenJDK6

bool

runtime

true

product

Print heap layout in response to SIGBREAK

share/runtime/globals.hpp

PrintIR0

OpenJDK6

bool

false

notproduct

Print full intermediate representation after construction

share/c1/c1_globals.hpp

PrintIR1

OpenJDK6

bool

false

notproduct

Print full intermediate representation after optimizations

share/c1/c1_globals.hpp

PrintIR2

OpenJDK6

bool

false

notproduct

Print full intermediate representation before code generation

share/c1/c1_globals.hpp

PrintIRDuringConstruction

OpenJDK6

bool

false

notproduct

Print IR as it's being constructed (helpful for debugging frontend)

share/c1/c1_globals.hpp

PrintIRWithLIR

OpenJDK6

bool

false

notproduct

Print IR instructions with generated LIR

share/c1/c1_globals.hpp

PrintIR

OpenJDK6

bool

false

notproduct

Print full intermediate representation after each change

share/c1/c1_globals.hpp

PrintIdealGraphAddress

OpenJDK6

ccstr

127.0.0.1

notproduct

IP address to connect to visualizer

share/opto/c2_globals.hpp

PrintIdealGraphFile

OpenJDK6

ccstr

NULL

notproduct

File to dump ideal graph to. If set overrides the use of the network

share/opto/c2_globals.hpp

PrintIdealGraphLevel

OpenJDK6

intx

0
range(-1, 4)

notproduct

Level of detail of the ideal graph printout. System-wide value, -1=printing is disabled,
0=print nothing except IGVPrintLevel directives,
4=all details printed. Level of detail of printouts can be set on a per-method level as well by using CompileCommand=option.

share/opto/c2_globals.hpp

PrintIdealGraphPort

OpenJDK6

intx

4444
range(0, SHRT_MAX)

notproduct

Ideal graph printer to network port

share/opto/c2_globals.hpp

PrintIdealGraph

OpenJDK9

bool

false

notproduct

Print ideal graph to XML file / network interface. By default attempts to connect to the visualizer on a socket.

share/opto/c2_globals.hpp

PrintIdealIndentThreshold

OpenJDK16

uintx

notproduct

A depth threshold of ideal graph. Indentation is disabled when users attempt to dump an ideal graph deeper than it.

share/opto/c2_globals.hpp

PrintIdealNodeCount

OpenJDK7

bool

false

notproduct

Print liveness counts of ideal nodes

share/opto/c2_globals.hpp

PrintIdeal

OpenJDK6

bool

false

notproduct

Print ideal graph before code generation

share/opto/c2_globals.hpp

PrintInitialBlockList

OpenJDK6

bool

false

notproduct

Print block list of BlockListBuilder

share/c1/c1_globals.hpp

PrintInlining

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintInterpreter

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintIntrinsics

OpenJDK6

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

PrintLIRWithAssembly

OpenJDK6

bool

false

notproduct

Show LIR instruction with generated assembly

share/c1/c1_globals.hpp

PrintLIR

OpenJDK6

bool

false

develop

print low-level IR

share/c1/c1_globals.hpp

PrintLockStatistics

OpenJDK6

bool

false

notproduct

Print precise statistics on the dynamic lock usage

share/opto/c2_globals.hpp

PrintMethodData

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintMethodFlushingStatistics

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintMethodFlushing

OpenJDK6

bool

runtime

false

develop

Print the nmethods being flushed

share/runtime/globals.hpp

PrintMethodHandleStubs

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintMiscellaneous

OpenJDK6

bool

runtime

false

develop

Print uncategorized debugging information (requires +Verbose)

share/runtime/globals.hpp

PrintNMTStatistics

OpenJDK7

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintNMethodStatistics

OpenJDK9

bool

runtime

false

notproduct

Print a summary statistic for the generated nmethods

share/runtime/globals.hpp

PrintNMethods

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintNativeNMethods

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintNotLoaded

OpenJDK6

bool

false

develop

Prints where classes are not loaded during code generation

share/c1/c1_globals.hpp

PrintNullCheckElimination

OpenJDK6

bool

false

develop

Print null check elimination

share/c1/c1_globals.hpp

PrintOptimizePtrCompare

OpenJDK6

bool

false

notproduct

Print information about optimized pointers compare

share/opto/c2_globals.hpp

PrintOptimizeStringConcat

OpenJDK6

bool

false

notproduct

Print information about transformations performed on Strings

share/opto/c2_globals.hpp

PrintOptoAssembly

OpenJDK6

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

PrintOptoInlining

OpenJDK6

bool

false

notproduct

Print compiler2 inlining decisions

share/opto/c2_globals.hpp

PrintOptoPeephole

OpenJDK6

bool

false

notproduct

Print New compiler peephole replacements

share/opto/c2_globals.hpp

PrintOptoStatistics

OpenJDK6

bool

false

notproduct

Print New compiler statistics

share/opto/c2_globals.hpp

PrintOpto

OpenJDK6

bool

false

notproduct

Print compiler2 attempts

share/opto/c2_globals.hpp

PrintParseStatistics

OpenJDK6

bool

false

notproduct

Print nodes, transforms and new values made per bytecode parsed

share/opto/c2_globals.hpp

PrintPhiFunctions

OpenJDK6

bool

false

notproduct

Print phi functions when they are created and simplified

share/c1/c1_globals.hpp

PrintPreciseBiasedLockingStatistics

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

PrintPreciseRTMLockingStatistics

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

PrintRelocations

OpenJDK6

bool

runtime

false

develop

Print relocation information for all nmethods when generated

share/runtime/globals.hpp

PrintRewrites

OpenJDK6

bool

runtime

false

notproduct

Print methods that are being rewritten

share/runtime/globals.hpp

PrintSharedArchiveAndExit

OpenJDK8

bool

runtime

false

product

Print shared archive file contents

share/runtime/globals.hpp

PrintSharedDictionary

OpenJDK8

bool

runtime

false

product

If PrintSharedArchiveAndExit is true, also print the shared dictionary

share/runtime/globals.hpp

PrintSignatureHandlers

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintSimpleStubs

OpenJDK6

bool

false

notproduct

Print SimpleStubs

share/c1/c1_globals.hpp

PrintStringTableStatistics

OpenJDK6

bool

runtime

false

product

print statistics about the StringTable and SymbolTable

share/runtime/globals.hpp

PrintStubCode

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintSymbolTableSizeHistogram

OpenJDK6

bool

runtime

false

notproduct

print histogram of the symbol table

share/runtime/globals.hpp

PrintSystemDictionaryAtExit

OpenJDK6

bool

runtime

false

notproduct

Print the system dictionary at exit

share/runtime/globals.hpp

PrintTieredEvents

OpenJDK6

bool

compiler

false

product

Print tiered events notifications

share/compiler/compiler_globals.hpp

PrintTouchedMethodsAtExit

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

PrintUnsafeOptimization

OpenJDK6

bool

false

develop

Print optimization of raw unsafe ops

share/c1/c1_globals.hpp

PrintVMOptions

OpenJDK6

bool

runtime

false

product

Print flags that appeared on the command line

share/runtime/globals.hpp

PrintValueNumbering

OpenJDK6

bool

false

develop

Print Value Numbering

share/c1/c1_globals.hpp

PrintVtableStats

OpenJDK6

bool

runtime

false

notproduct

print vtables stats at end of run

share/runtime/globals.hpp

PrintWarnings

OpenJDK6

bool

runtime

true

product

Print JVM warnings to output stream

share/runtime/globals.hpp

ProcessDistributionStride

OpenJDK6

uintx

runtime

4
range(0, max_juint)

product

Stride through processors when distributing processes

share/runtime/globals.hpp

ProfileDynamicTypes

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

ProfileInterpreter

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

ProfileInterpreter

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

ProfileInterpreter

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

ProfileInterpreter

OpenJDK6

bool

runtime

product_pd

Profile at the bytecode level during interpretation

share/runtime/globals.hpp

ProfileInterpreter

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

ProfileInterpreter

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

ProfileInterpreter

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c1_globals_x86.hpp

ProfileMaturityPercentage

OpenJDK6

intx

runtime

20
range(0, 100)

product

number of method invocations/branches (expressed as % of CompileThreshold) before using the method's profile

share/runtime/globals.hpp

ProfileTraps

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

ProfileTraps

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

ProfileTraps

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

ProfileTraps

OpenJDK6

bool

runtime

develop_pd

Profile deoptimization traps at the bytecode level

share/runtime/globals.hpp

ProfileTraps

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

ProfileTraps

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

ProfileTraps

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c1_globals_x86.hpp

ProfiledCodeHeapSize

OpenJDK9

intx

aarch64

14*M

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

ProfiledCodeHeapSize

OpenJDK9

size_t

arm

14*M

define_pd_global

cpu/arm/c2_globals_arm.hpp

ProfiledCodeHeapSize

OpenJDK9

uintx

compiler

define_pd_global

share/compiler/compiler_globals_pd.hpp

ProfiledCodeHeapSize

OpenJDK9

uintx

runtime

product_pd

Size of code heap with profiled methods (in bytes)

share/runtime/globals.hpp

ProfiledCodeHeapSize

OpenJDK9

uintx

ppc

14*M

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

ProfiledCodeHeapSize

OpenJDK9

uintx

s390

22*M

define_pd_global

cpu/s390/c2_globals_s390.hpp

ProfiledCodeHeapSize

OpenJDK9

uintx

x86

14*M

define_pd_global

cpu/x86/c1_globals_x86.hpp

PromotedPadding

OpenJDK6

uintx

3
range(0, max_juint)

product

How much buffer to keep for promotion failure

share/gc/shared/gc_globals.hpp

PromotionFailureALotCount

OpenJDK6

uintx

1000

develop

Number of promotion failures occurring at PLAB promotion attempts at young collectors

share/gc/shared/gc_globals.hpp

PromotionFailureALotInterval

OpenJDK6

uintx

develop

Total collections between promotion failures a lot

share/gc/shared/gc_globals.hpp

PromotionFailureALot

OpenJDK6

bool

false

notproduct

Use promotion failure handling on every youngest generation collection

share/gc/shared/gc_globals.hpp

ProtectionDomainVerification

OpenJDK6

bool

runtime

true

develop

Verify protection domain before resolution in system dictionary

share/runtime/globals.hpp

QueuedAllocationWarningCount

OpenJDK6

uintx

0
range(0, max_uintx)

product

Number of times an allocation that queues behind a GC will retry before printing a warning

share/gc/shared/gc_globals.hpp

RTMAbortRatio

OpenJDK8

int

ppc

50
range(0, 100) /* natural range */

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

RTMAbortRatio

OpenJDK8

int

x86

50
range(0, 100) /* natural range */

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

RTMAbortThreshold

OpenJDK8

int

ppc

1000
range(0, max_jint)

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

RTMAbortThreshold

OpenJDK8

int

x86

1000
range(0, max_jint)

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

RTMLockingCalculationDelay

OpenJDK8

intx

ppc

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

RTMLockingCalculationDelay

OpenJDK8

intx

x86

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

RTMLockingThreshold

OpenJDK8

int

ppc

10000
range(0, max_jint)

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

RTMLockingThreshold

OpenJDK8

int

x86

10000
range(0, max_jint)

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

RTMRetryCount

OpenJDK8

int

ppc

5
range(0, max_jint)

product

Number of RTM retries on lock abort or busy

cpu/ppc/globals_ppc.hpp

RTMRetryCount

OpenJDK8

int

x86

5
range(0, max_jint)

product

Number of RTM retries on lock abort or busy

cpu/x86/globals_x86.hpp

RTMSpinLoopCount

OpenJDK8

int

ppc

100
range(0, 32767) /* immediate operand limit on ppc */

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

RTMSpinLoopCount

OpenJDK8

int

x86

100
range(0, max_jint)

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

RTMTotalCountIncrRate

OpenJDK8

int

ppc

64
range(1, 32767) /* immediate operand limit on ppc */

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

RTMTotalCountIncrRate

OpenJDK8

int

x86

64
range(1, max_jint)

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

RangeCheckElimination

OpenJDK6

bool

runtime

true

product

Eliminate range checks

share/runtime/globals.hpp

ReassociateInvariants

OpenJDK6

bool

true

product

Enable reassociation of expressions with loop invariants.

share/opto/c2_globals.hpp

ReduceBulkZeroing

OpenJDK6

bool

true

product

When bulk-initializing, try to avoid needless zeroing

share/opto/c2_globals.hpp

ReduceFieldZeroing

OpenJDK6

bool

true

product

When initializing fields, try to avoid needless zeroing

share/opto/c2_globals.hpp

ReduceInitialCardMarks

OpenJDK6

bool

true

product

When initializing fields, try to avoid needless card marks

share/opto/c2_globals.hpp

ReduceNumberOfCompilerThreads

OpenJDK11

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

ReduceSignalUsage

OpenJDK6

bool

runtime

false

product

Reduce the use of OS signals in Java and/or the VM

share/runtime/globals.hpp

RefDiscoveryPolicy

OpenJDK6

intx

0
range(ReferenceProcessor::DiscoveryPolicyMin,

product

Select type of reference discovery policy: reference-based(0) or referent-based(1)

share/gc/shared/gc_globals.hpp

ReferencesPerThread

OpenJDK11

size_t

1000

product

EXPERIMENTAL

share/gc/shared/gc_globals.hpp

RegisterCostAreaRatio

OpenJDK6

intx

aarch64

16000

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

RegisterCostAreaRatio

OpenJDK6

intx

arm

16000

define_pd_global

cpu/arm/c2_globals_arm.hpp

RegisterCostAreaRatio

OpenJDK6

intx

develop_pd

Spill selection in reg allocator: scale area by (X/64K) before adding cost

share/opto/c2_globals.hpp

RegisterCostAreaRatio

OpenJDK6

intx

ppc

16000

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

RegisterCostAreaRatio

OpenJDK6

intx

s390

12000

define_pd_global

cpu/s390/c2_globals_s390.hpp

RegisterCostAreaRatio

OpenJDK6

intx

x86

16000

define_pd_global

cpu/x86/c2_globals_x86.hpp

RegisterFinalizersAtInit

OpenJDK6

bool

runtime

true

product

share/runtime/globals.hpp

RegisterReferences

OpenJDK6

bool

runtime

true

develop

Tell whether the VM should register soft/weak/final/phantom references

share/runtime/globals.hpp

RelaxAccessControlCheck

OpenJDK6

bool

runtime

false

product

Relax the access control checks in the verifier

share/runtime/globals.hpp

RenumberLiveNodes

OpenJDK8

bool

true

develop

Renumber live nodes

share/opto/c2_globals.hpp

ReoptimizeCallSequences

OpenJDK7

bool

ppc

true

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

ReoptimizeCallSequences

OpenJDK7

bool

s390

true

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

RepeatCompilation

OpenJDK16

intx

runtime

0
range(0, max_jint)

product

DIAGNOSTIC

share/runtime/globals.hpp

ReplayCompiles

OpenJDK8

bool

compiler

false

develop

Enable replay of compilations from ReplayDataFile

share/compiler/compiler_globals.hpp

ReplayDataFile

OpenJDK8

ccstr

compiler

NULL

product

File containing compilation replay information[default: ./replay_pid%p.log] (%p replaced with pid)

share/compiler/compiler_globals.hpp

ReplayIgnoreInitErrors

OpenJDK8

bool

compiler

false

develop

Ignore exceptions thrown during initialization for replay

share/compiler/compiler_globals.hpp

ReplaySuppressInitializers

OpenJDK8

intx

compiler

2
range(0, 3)

develop

Control handling of class initialization during replay:
0 - don't do anything special;
1 - treat all class initializers as empty;
2 - treat class initializers for application classes as empty;
3 - allow all class initializers to run during bootstrap but pretend they are empty after starting replay

share/compiler/compiler_globals.hpp

RequireSharedSpaces

OpenJDK6

bool

runtime

false

product

Require shared spaces for metadata

share/runtime/globals.hpp

ReservedCodeCacheSize

OpenJDK6

intx

aarch64

32*M

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

ReservedCodeCacheSize

OpenJDK6

size_t

arm

32*M

define_pd_global

cpu/arm/c2_globals_arm.hpp

ReservedCodeCacheSize

OpenJDK6

uintx

compiler

32*M

define_pd_global

share/compiler/compiler_globals_pd.hpp

ReservedCodeCacheSize

OpenJDK6

uintx

runtime

product_pd

Reserved code cache size (in bytes) - maximum code cache size

share/runtime/globals.hpp

ReservedCodeCacheSize

OpenJDK6

uintx

ppc

32*M

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

ReservedCodeCacheSize

OpenJDK6

uintx

s390

48*M

define_pd_global

cpu/s390/c2_globals_s390.hpp

ReservedCodeCacheSize

OpenJDK6

uintx

x86

32*M

define_pd_global

cpu/x86/c1_globals_x86.hpp

ResizePLAB

OpenJDK6

bool

true

product

Dynamically resize (survivor space) promotion LAB's

share/gc/shared/gc_globals.hpp

ResizeTLAB

OpenJDK6

bool

true

product

Dynamically resize TLAB size for threads

share/gc/shared/tlab_globals.hpp

RestoreMXCSROnJNICalls

OpenJDK6

bool

runtime

false

product

Restore MXCSR when returning from JNI calls

share/runtime/globals.hpp

RestrictContended

OpenJDK8

bool

runtime

true

product

Restrict @Contended to trusted classes

share/runtime/globals.hpp

RestrictReservedStack

OpenJDK9

bool

runtime

true

product

Restrict @ReservedStackAccess to trusted classes

share/runtime/globals.hpp

RewriteBytecodes

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/globals_aarch64.hpp

RewriteBytecodes

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/globals_arm.hpp

RewriteBytecodes

OpenJDK6

bool

runtime

product_pd

Allow rewriting of bytecodes (bytecodes are not immutable)

share/runtime/globals.hpp

RewriteBytecodes

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/globals_ppc.hpp

RewriteBytecodes

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/globals_s390.hpp

RewriteBytecodes

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/globals_x86.hpp

RewriteBytecodes

OpenJDK6

bool

zero

true

define_pd_global

cpu/zero/globals_zero.hpp

RewriteFrequentPairs

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/globals_aarch64.hpp

RewriteFrequentPairs

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/globals_arm.hpp

RewriteFrequentPairs

OpenJDK6

bool

runtime

product_pd

Rewrite frequently used bytecode pairs into a single bytecode

share/runtime/globals.hpp

RewriteFrequentPairs

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/globals_ppc.hpp

RewriteFrequentPairs

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/globals_s390.hpp

RewriteFrequentPairs

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/globals_x86.hpp

RewriteFrequentPairs

OpenJDK6

bool

zero

true

define_pd_global

cpu/zero/globals_zero.hpp

SafepointALot

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

SafepointTimeoutDelay

OpenJDK6

intx

runtime

10000
range(0, max_intx LP64_ONLY(/MICROUNITS))

product

Delay in milliseconds for option SafepointTimeout

share/runtime/globals.hpp

SafepointTimeout

OpenJDK6

bool

runtime

false

product

Time out and warn or fail after SafepointTimeoutDelay milliseconds if failed to reach safepoint

share/runtime/globals.hpp

ScavengeALotInterval

OpenJDK6

intx

notproduct

Interval between which scavenge will occur with +ScavengeALot

share/gc/shared/gc_globals.hpp

ScavengeALot

OpenJDK6

bool

false

notproduct

Force scavenge at every Nth exit from the runtime system (N=ScavengeALotInterval)

share/gc/shared/gc_globals.hpp

ScavengeBeforeFullGC

OpenJDK6

bool

true

product

Scavenge youngest generation before each full GC.

share/gc/shared/gc_globals.hpp

ScavengeRootsInCode

OpenJDK6

intx

runtime

2
range(0, 2)

product

DIAGNOSTIC

share/runtime/globals.hpp

SegmentedCodeCache

OpenJDK9

bool

runtime

false

product

Use a segmented code cache

share/runtime/globals.hpp

SelectivePhiFunctions

OpenJDK6

bool

true

develop

create phi functions at loop headers only when necessary

share/c1/c1_globals.hpp

SelfDestructTimer

OpenJDK6

intx

runtime

0
range(0, max_intx)

product

Will cause VM to terminate after a given time (in minutes) (0 means off)

share/runtime/globals.hpp

SerializeVMOutput

OpenJDK6

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

SharedArchiveConfigFile

OpenJDK10

ccstr

runtime

NULL

product

Data to add to the CDS archive file

share/runtime/globals.hpp

SharedArchiveFile

OpenJDK8

ccstr

runtime

NULL

product

Override the default location of the CDS archive file

share/runtime/globals.hpp

SharedBaseAddress

OpenJDK8

size_t

runtime

LP64_ONLY(32*G)NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0))
range(0, SIZE_MAX)

product

Address to allocate shared memory region for class data

share/runtime/globals.hpp

SharedClassListFile

OpenJDK8

ccstr

runtime

NULL

product

Override the default CDS class list

share/runtime/globals.hpp

SharedSymbolTableBucketSize

OpenJDK9

uintx

runtime

4
range(2, 246)

product

Average number of symbols per bucket in shared table

share/runtime/globals.hpp

ShenandoahAdaptiveDecayFactor

OpenJDK16

double

0.5
range(0,1.0)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAdaptiveInitialConfidence

OpenJDK16

double

1.8

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAdaptiveInitialSpikeThreshold

OpenJDK16

double

1.8

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAdaptiveSampleFrequencyHz

OpenJDK16

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAdaptiveSampleSizeSeconds

OpenJDK16

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAllocFailureALot

OpenJDK11

bool

false

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAllocSpikeFactor

OpenJDK11

uintx

5
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAllocationThreshold

OpenJDK11

uintx

0
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahAlwaysClearSoftRefs

OpenJDK11

bool

false

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahCASBarrier

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahCloneBarrier

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahControlIntervalAdjustPeriod

OpenJDK11

uintx

1000

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahControlIntervalMax

OpenJDK11

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahControlIntervalMin

OpenJDK11

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahCriticalFreeThreshold

OpenJDK11

uintx

1
range(0, 100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahDegeneratedGC

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahElasticTLAB

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahEvacReserveOverflow

OpenJDK11

bool

true

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahEvacReserve

OpenJDK11

uintx

5
range(1,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahEvacWaste

OpenJDK11

double

1.2
range(1.0,100.0)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahFullGCThreshold

OpenJDK11

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahGCHeuristics

OpenJDK11

ccstr

adaptive

product

GC heuristics to use. This fine-tunes the GC mode selected, by choosing when to start the GC, how much to process on each cycle, and what other features to automatically enable. Possible values are: adaptive - adapt to maintain the given amount of free heap at all times, even during the GC cycle; static - trigger GC when free heap falls below the threshold; aggressive - run GC continuously, try to evacuate everything; compact - run GC more frequently and with deeper targets to free up more memory.

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahGCMode

OpenJDK11

ccstr

satb

product

GC mode to use. Among other things, this defines which barriers are in in use. Possible values are: satb - snapshot-at-the-beginning concurrent GC (three pass mark-evac-update); iu - incremental-update concurrent GC (three pass mark-evac-update); passive - stop the world GC only (either degenerated or full)

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahGarbageThreshold

OpenJDK11

uintx

25
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahGuaranteedGCInterval

OpenJDK11

uintx

5*60*1000

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahHumongousMoves

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahHumongousThreshold

OpenJDK11

intx

100
range(1, 100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahIUBarrier

OpenJDK17

bool

false

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahImmediateThreshold

OpenJDK11

uintx

90
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahImplicitGCInvokesConcurrent

OpenJDK11

bool

false

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahInitFreeThreshold

OpenJDK11

uintx

70
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahLearningSteps

OpenJDK11

uintx

5
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahLoadRefBarrier

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahLoopOptsAfterExpansion

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahMarkLoopStride

OpenJDK11

uintx

1000

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahMarkScanPrefetch

OpenJDK11

intx

32
range(0, 256)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahMaxRegionSize

OpenJDK11

size_t

32 * M

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahMinFreeThreshold

OpenJDK11

uintx

10
range(0,100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahMinRegionSize

OpenJDK11

size_t

256 * K

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahOOMDuringEvacALot

OpenJDK11

bool

false

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahPacingCycleSlack

OpenJDK11

uintx

10
range(0, 100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahPacingIdleSlack

OpenJDK11

uintx

2
range(0, 100)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahPacingMaxDelay

OpenJDK11

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahPacingSurcharge

OpenJDK11

double

1.1
range(1.0, 100.0)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahPacing

OpenJDK11

bool

true

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahParallelRegionStride

OpenJDK11

uintx

1024

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahRegionSamplingRate

OpenJDK11

int

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahRegionSampling

OpenJDK11

bool

false

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahRegionSize

OpenJDK11

size_t

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahSATBBarrier

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahSATBBufferFlushInterval

OpenJDK11

uintx

100

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahSATBBufferSize

OpenJDK11

size_t

1 * K
range(1, max_uintx)

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahSelfFixing

OpenJDK11

bool

true

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahSuspendibleWorkers

OpenJDK11

bool

false

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahTargetNumRegions

OpenJDK11

size_t

2048

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahUncommitDelay

OpenJDK11

uintx

5*60*1000

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahUncommit

OpenJDK11

bool

true

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahUnloadClassesFrequency

OpenJDK11

uintx

product

EXPERIMENTAL

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahVerifyLevel

OpenJDK11

intx

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahVerifyOptoBarriers

OpenJDK11

bool

false

develop

Verify no missing barriers in C2.

share/gc/shenandoah/shenandoah_globals.hpp

ShenandoahVerify

OpenJDK11

bool

false

product

DIAGNOSTIC

share/gc/shenandoah/shenandoah_globals.hpp

ShowCodeDetailsInExceptionMessages

OpenJDK14

bool

runtime

true

product

MANAGEABLE

share/runtime/globals.hpp

ShowHiddenFrames

OpenJDK7

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

ShowMessageBoxOnError

OpenJDK6

bool

runtime

false

product

Keep process alive on VM fatal error

share/runtime/globals.hpp

ShowRegistersOnAssert

OpenJDK11

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

ShrinkHeapInSteps

OpenJDK9

bool

runtime

true

product

When disabled, informs the GC to shrink the java heap directly to the target size at the next full GC rather than requiring smaller steps during multiple full GCs.

share/runtime/globals.hpp

SoftMatchFailure

OpenJDK6

bool

trueInProduct

develop

If the DFA fails to match a node, print a message and bail out

share/opto/c2_globals.hpp

SoftMaxHeapSize

OpenJDK13

size_t

product

MANAGEABLE

share/gc/shared/gc_globals.hpp

SoftRefLRUPolicyMSPerMB

OpenJDK6

intx

runtime

1000
range(0, max_intx)

product

Number of milliseconds per MB of free space in the heap

share/runtime/globals.hpp

SoftwarePrefetchHintDistance

OpenJDK10

int

aarch64

-1
range(-1, 4096)

product

Use prfm hint with specified distance in compiled code.Value -1 means off.

cpu/aarch64/globals_aarch64.hpp

SpecTrapLimitExtraEntries

OpenJDK8

intx

runtime

product

EXPERIMENTAL

share/runtime/globals.hpp

SpecialArraysEquals

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

SpecialEncodeISOArray

OpenJDK8

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

SpecialStringCompareTo

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

SpecialStringEquals

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

SpecialStringIndexOf

OpenJDK6

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

SplitIfBlocks

OpenJDK6

bool

true

product

Clone compares and control flow through merge points to fold some branches

share/opto/c2_globals.hpp

StackPrintLimit

OpenJDK6

intx

runtime

100

develop

number of stack frames to print in VM-level stack dump

share/runtime/globals.hpp

StackRedPages

OpenJDK6

intx

aarch64

DEFAULT_STACK_RED_PAGES

define_pd_global

cpu/aarch64/globals_aarch64.hpp

StackRedPages

OpenJDK6

intx

arm

DEFAULT_STACK_RED_PAGES

define_pd_global

cpu/arm/globals_arm.hpp

StackRedPages

OpenJDK6

intx

runtime

product_pd

Number of red zone (unrecoverable overflows) pages of size
4KB. If pages are bigger red zone is aligned up.

share/runtime/globals.hpp

StackRedPages

OpenJDK6

intx

ppc

DEFAULT_STACK_RED_PAGES

define_pd_global

cpu/ppc/globals_ppc.hpp

StackRedPages

OpenJDK6

intx

s390

DEFAULT_STACK_RED_PAGES

define_pd_global

cpu/s390/globals_s390.hpp

StackRedPages

OpenJDK6

intx

x86

DEFAULT_STACK_RED_PAGES

define_pd_global

cpu/x86/globals_x86.hpp

StackRedPages

OpenJDK6

intx

zero

DEFAULT_STACK_RED_PAGES

define_pd_global

cpu/zero/globals_zero.hpp

StackReservedPages

OpenJDK9

intx

aarch64

DEFAULT_STACK_RESERVED_PAGES

define_pd_global

cpu/aarch64/globals_aarch64.hpp

StackReservedPages

OpenJDK9

intx

arm

DEFAULT_STACK_RESERVED_PAGES

define_pd_global

cpu/arm/globals_arm.hpp

StackReservedPages

OpenJDK9

intx

runtime

product_pd

Number of reserved zone (reserved to annotated methods) pages of size 4KB. If pages are bigger reserved zone is aligned up.

share/runtime/globals.hpp

StackReservedPages

OpenJDK9

intx

ppc

DEFAULT_STACK_RESERVED_PAGES

define_pd_global

cpu/ppc/globals_ppc.hpp

StackReservedPages

OpenJDK9

intx

s390

DEFAULT_STACK_RESERVED_PAGES

define_pd_global

cpu/s390/globals_s390.hpp

StackReservedPages

OpenJDK9

intx

x86

DEFAULT_STACK_RESERVED_PAGES

define_pd_global

cpu/x86/globals_x86.hpp

StackReservedPages

OpenJDK9

intx

zero

DEFAULT_STACK_RESERVED_PAGES

define_pd_global

cpu/zero/globals_zero.hpp

StackShadowPages

OpenJDK6

intx

aarch64

DEFAULT_STACK_SHADOW_PAGES

define_pd_global

cpu/aarch64/globals_aarch64.hpp

StackShadowPages

OpenJDK6

intx

arm

DEFAULT_STACK_SHADOW_PAGES

define_pd_global

cpu/arm/globals_arm.hpp

StackShadowPages

OpenJDK6

intx

runtime

product_pd

Number of shadow zone (for overflow checking) pages of size
4KB. If pages are bigger shadow zone is aligned up. This should exceed the depth of the VM and native call stack.

share/runtime/globals.hpp

StackShadowPages

OpenJDK6

intx

ppc

DEFAULT_STACK_SHADOW_PAGES

define_pd_global

cpu/ppc/globals_ppc.hpp

StackShadowPages

OpenJDK6

intx

s390

DEFAULT_STACK_SHADOW_PAGES

define_pd_global

cpu/s390/globals_s390.hpp

StackShadowPages

OpenJDK6

intx

x86

DEFAULT_STACK_SHADOW_PAGES

define_pd_global

cpu/x86/globals_x86.hpp

StackShadowPages

OpenJDK6

intx

zero

DEFAULT_STACK_SHADOW_PAGES

define_pd_global

cpu/zero/globals_zero.hpp

StackTraceInThrowable

OpenJDK6

bool

runtime

true

product

Collect backtrace in throwable when exception happens

share/runtime/globals.hpp

StackYellowPages

OpenJDK6

intx

aarch64

DEFAULT_STACK_YELLOW_PAGES

define_pd_global

cpu/aarch64/globals_aarch64.hpp

StackYellowPages

OpenJDK6

intx

arm

DEFAULT_STACK_YELLOW_PAGES

define_pd_global

cpu/arm/globals_arm.hpp

StackYellowPages

OpenJDK6

intx

runtime

product_pd

Number of yellow zone (recoverable overflows) pages of size
4KB. If pages are bigger yellow zone is aligned up.

share/runtime/globals.hpp

StackYellowPages

OpenJDK6

intx

ppc

DEFAULT_STACK_YELLOW_PAGES

define_pd_global

cpu/ppc/globals_ppc.hpp

StackYellowPages

OpenJDK6

intx

s390

DEFAULT_STACK_YELLOW_PAGES

define_pd_global

cpu/s390/globals_s390.hpp

StackYellowPages

OpenJDK6

intx

x86

DEFAULT_STACK_YELLOW_PAGES

define_pd_global

cpu/x86/globals_x86.hpp

StackYellowPages

OpenJDK6

intx

zero

DEFAULT_STACK_YELLOW_PAGES

define_pd_global

cpu/zero/globals_zero.hpp

StartAggressiveSweepingAt

OpenJDK9

uintx

runtime

10
range(0, 100)

product

Start aggressive sweeping if X[%] of the code cache is free.Segmented code cache: X[%] of the non-profiled heap.Non-segmented code cache: X[%] of the total code cache

share/runtime/globals.hpp

StartAttachListener

OpenJDK6

bool

runtime

false

product

Always start Attach Listener at VM startup

share/runtime/globals.hpp

StartFlightRecording

OpenJDK11

ccstr

runtime

NULL

product

Start flight recording with options

share/runtime/globals.hpp

StopInterpreterAt

OpenJDK6

intx

runtime

develop

Stop interpreter execution at specified bytecode number

share/runtime/globals.hpp

StressArrayCopyMacroNode

OpenJDK9

bool

false

develop

Perform ArrayCopy load/store replacement during IGVN only

share/opto/c2_globals.hpp

StressCCP

OpenJDK17

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

StressCodeAging

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

StressCodeBuffers

OpenJDK6

bool

runtime

false

develop

Exercise code buffer expansion and other rare state changes

share/runtime/globals.hpp

StressCompiledExceptionHandlers

OpenJDK7

bool

runtime

false

develop

Exercise compiled exception handlers

share/runtime/globals.hpp

StressGCM

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

StressIGVN

OpenJDK16

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

StressLCM

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

StressLdcRewrite

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

StressLinearScan

OpenJDK6

bool

false

develop

scramble block order used by LinearScan (stress test)

share/c1/c1_globals.hpp

StressLongCountedLoop

OpenJDK16

uintx

0
range(0, max_juint)

develop

if > 0, convert int counted loops to long counted loopsto stress handling of long counted loops: run inner loopfor at most jint_max / StressLongCountedLoop

share/opto/c2_globals.hpp

StressLoopInvariantCodeMotion

OpenJDK8

bool

false

develop

stress loop invariant code motion

share/c1/c1_globals.hpp

StressMethodHandleLinkerInlining

OpenJDK11

bool

false

develop

Stress inlining through method handle linkers

share/opto/c2_globals.hpp

StressRangeCheckElimination

OpenJDK8

bool

false

develop

stress Range Check Elimination

share/c1/c1_globals.hpp

StressRecompilation

OpenJDK6

bool

false

develop

Recompile each compiled method without subsuming loads or escape analysis.

share/opto/c2_globals.hpp

StressReflectiveCode

OpenJDK6

bool

false

develop

Use inexact types at allocations, etc., to test reflection

share/opto/c2_globals.hpp

StressRewriter

OpenJDK8

bool

runtime

false

develop

Stress linktime bytecode rewriting

share/runtime/globals.hpp

StressSeed

OpenJDK16

uint

0
range(0, max_juint)

product

DIAGNOSTIC

share/opto/c2_globals.hpp

StringDeduplicationAgeThreshold

OpenJDK8

uintx

runtime

3
range(1, markWord::max_age)

product

A string must reach this age (or be promoted to an old region) to be considered for deduplication

share/runtime/globals.hpp

StringDeduplicationRehashALot

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

StringDeduplicationResizeALot

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

StringTableSize

OpenJDK6

uintx

runtime

defaultStringTableSize
range(minimumStringTableSize, 16777216ul /* 2^24 */)

product

Number of buckets in the interned String table (will be rounded to nearest higher power of 2)

share/runtime/globals.hpp

SubsumeLoads

OpenJDK6

bool

true

develop

Attempt to compile while subsuming loads into machine instructions.

share/opto/c2_globals.hpp

SuperWordLoopUnrollAnalysis

OpenJDK9

bool

aarch64

true

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

SuperWordLoopUnrollAnalysis

OpenJDK9

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

SuperWordLoopUnrollAnalysis

OpenJDK9

bool

product_pd

Map number of unrolls for main loop via Superword Level Parallelism analysis

share/opto/c2_globals.hpp

SuperWordLoopUnrollAnalysis

OpenJDK9

bool

ppc

true

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

SuperWordLoopUnrollAnalysis

OpenJDK9

bool

s390

false

define_pd_global

cpu/s390/c2_globals_s390.hpp

SuperWordLoopUnrollAnalysis

OpenJDK9

bool

x86

true

define_pd_global

cpu/x86/c2_globals_x86.hpp

SuperWordRTDepCheck

OpenJDK6

bool

false

develop

Enable runtime dependency checks.

share/opto/c2_globals.hpp

SuperWordReductions

OpenJDK9

bool

true

product

Enable reductions support in superword.

share/opto/c2_globals.hpp

SuperwordUseVSX

OpenJDK10

bool

ppc

false

product

Use Power8 VSX instructions for superword optimization.

cpu/ppc/globals_ppc.hpp

SuppressErrorAt

OpenJDK6

ccstrlist

runtime

List of assertions (file:line) to muzzle

notproduct

share/runtime/globals.hpp

SuppressFatalErrorMessage

OpenJDK6

bool

runtime

false

product

Report NO fatal error message (avoid deadlock)

share/runtime/globals.hpp

SurvivorPadding

OpenJDK6

uintx

3
range(0, max_juint)

product

How much buffer to keep for survivor overflow

share/gc/shared/gc_globals.hpp

SurvivorRatio

OpenJDK6

uintx

8
range(1, max_uintx-2)

product

Ratio of eden/survivor space size

share/gc/shared/gc_globals.hpp

SuspendRetryCount

OpenJDK6

intx

runtime

50
range(0, max_intx)

product

Maximum retry count for an external suspend request

share/runtime/globals.hpp

SuspendRetryDelay

OpenJDK6

intx

runtime

5
range(0, max_intx)

product

Milliseconds to delay per retry (* current_retry_count)

share/runtime/globals.hpp

SweeperLogEntries

OpenJDK6

intx

runtime

1024

notproduct

Number of records in the ring buffer of sweeper activity

share/runtime/globals.hpp

SweeperThreshold

OpenJDK15

double

runtime

0.5
range(0.0, 100.0)

product

Threshold controlling when code cache sweeper is invoked.Value is percentage of ReservedCodeCacheSize.

share/runtime/globals.hpp

SymbolTableSize

OpenJDK8

uintx

runtime

defaultSymbolTableSize
range(minimumSymbolTableSize, 16777216ul /* 2^24 */)

product

EXPERIMENTAL

share/runtime/globals.hpp

TLABAllocationWeight

OpenJDK6

uintx

35
range(0, 100)

product

Allocation averaging weight

share/gc/shared/tlab_globals.hpp

TLABRefillWasteFraction

OpenJDK6

uintx

64
range(1, max_juint)

product

Maximum TLAB waste at a refill (internal fragmentation)

share/gc/shared/tlab_globals.hpp

TLABSize

OpenJDK6

size_t

product

Starting TLAB size (in bytes); zero means set ergonomically

share/gc/shared/tlab_globals.hpp

TLABStats

OpenJDK6

Deprecated in JDK12

bool

true

product

Provide more detailed and expensive TLAB statistics.

share/gc/shared/tlab_globals.hpp

TLABWasteIncrement

OpenJDK6

uintx

4
range(0, max_jint)

product

Increment allowed waste at slow allocation

share/gc/shared/tlab_globals.hpp

TLABWasteTargetPercent

OpenJDK6

uintx

1
range(1, 100)

product

Percentage of Eden that can be wasted

share/gc/shared/tlab_globals.hpp

TargetPLABWastePct

OpenJDK6

uintx

10
range(1, 100)

product

Target wasted space in last buffer as percent of overall allocation

share/gc/shared/gc_globals.hpp

TargetSurvivorRatio

OpenJDK6

uintx

50
range(0, 100)

product

Desired percentage of survivor space used after scavenge

share/gc/shared/gc_globals.hpp

TenuredGenerationSizeIncrement

OpenJDK6

uintx

20
range(0, 100)

product

Adaptive size percentage change in tenured generation

share/gc/shared/gc_globals.hpp

TenuredGenerationSizeSupplementDecay

OpenJDK6

uintx

2
range(1, max_uintx)

product

Decay factor to TenuredGenerationSizeIncrement

share/gc/shared/gc_globals.hpp

TenuredGenerationSizeSupplement

OpenJDK6

uintx

80
range(0, 100)

product

Supplement to TenuredGenerationSizeIncrement used at startup

share/gc/shared/gc_globals.hpp

TestCrashInErrorHandler

OpenJDK9

uintx

runtime

0
range(0, 17)

develop

If > 0, provokes an error inside VM error handler (a secondary crash). see controlled_crash() in vmError.cpp

share/runtime/globals.hpp

TestSafeFetchInErrorHandler

OpenJDK9

bool

runtime

false

develop

If true, tests SafeFetch inside error handler.

share/runtime/globals.hpp

TestUnresponsiveErrorHandler

OpenJDK10

bool

runtime

false

develop

If true, simulates an unresponsive error handler.

share/runtime/globals.hpp

ThreadPriorityPolicy

OpenJDK6

intx

runtime

0
range(0, 1)

product

0 : Normal. VM chooses priorities that are appropriate for normal applications. On Windows applications are allowed to use higher native priorities. However, with ThreadPriorityPolicy=0, VM will not use the highest possible native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with system threads. On Linux thread priorities are ignored because the OS does not support static priority in SCHED_OTHER scheduling class which is the only choice for non-root, non-realtime applications.
1 : Aggressive. Java thread priorities map over to the entire range of native thread priorities. Higher Java thread priorities map to higher native thread priorities. This policy should be used with care, as sometimes it can cause performance degradation in the application and/or the entire system. On Linux/BSD/macOS this policy requires root privilege or an extended capability.

share/runtime/globals.hpp

ThreadPriorityVerbose

OpenJDK6

bool

runtime

false

product

Print priority changes

share/runtime/globals.hpp

ThreadStackSize

OpenJDK6

intx

aix

ppc

2048

define_pd_global

// 0 => use system default

os_cpu/aix_ppc/globals_aix_ppc.hpp

ThreadStackSize

OpenJDK6

intx

bsd

x86

320

define_pd_global

os_cpu/bsd_x86/globals_bsd_x86.hpp

ThreadStackSize

OpenJDK6

intx

bsd

zero

1536

define_pd_global

os_cpu/bsd_zero/globals_bsd_zero.hpp

ThreadStackSize

OpenJDK6

intx

linux

aarch64

2048

define_pd_global

// 0 => use system default

os_cpu/linux_aarch64/globals_linux_aarch64.hpp

ThreadStackSize

OpenJDK6

intx

linux

arm

320

define_pd_global

os_cpu/linux_arm/globals_linux_arm.hpp

ThreadStackSize

OpenJDK6

intx

linux

ppc

2048

define_pd_global

// 0 => use system default

os_cpu/linux_ppc/globals_linux_ppc.hpp

ThreadStackSize

OpenJDK6

intx

linux

s390

1024

define_pd_global

// 0 => Use system default.

os_cpu/linux_s390/globals_linux_s390.hpp

ThreadStackSize

OpenJDK6

intx

linux

x86

320

define_pd_global

os_cpu/linux_x86/globals_linux_x86.hpp

ThreadStackSize

OpenJDK6

intx

linux

zero

1536

define_pd_global

os_cpu/linux_zero/globals_linux_zero.hpp

ThreadStackSize

OpenJDK6

intx

runtime

product_pd

Thread Stack Size (in Kbytes)

share/runtime/globals.hpp

ThreadStackSize

OpenJDK6

intx

windows

aarch64

define_pd_global

// 0 => use system default

os_cpu/windows_aarch64/globals_windows_aarch64.hpp

ThreadStackSize

OpenJDK6

intx

windows

x86

define_pd_global

// 0 => use system default

os_cpu/windows_x86/globals_windows_x86.hpp

ThresholdTolerance

OpenJDK6

uintx

10
range(0, 100)

product

Allowed collection cost difference between generations

share/gc/shared/gc_globals.hpp

Tier0AOTBackEdgeThreshold

OpenJDK14

intx

compiler

60000
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier0AOTCompileThreshold

OpenJDK14

intx

compiler

2000
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier0AOTInvocationThreshold

OpenJDK14

intx

compiler

200
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier0AOTMinInvocationThreshold

OpenJDK14

intx

compiler

100
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier0BackedgeNotifyFreqLog

OpenJDK6

intx

compiler

10
range(0, 30)

product

Interpreter (tier 0) invocation notification frequency

share/compiler/compiler_globals.hpp

Tier0Delay

OpenJDK14

intx

compiler

5
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier0InvokeNotifyFreqLog

OpenJDK6

intx

compiler

7
range(0, 30)

product

Interpreter (tier 0) invocation notification frequency

share/compiler/compiler_globals.hpp

Tier0ProfilingStartPercentage

OpenJDK6

intx

compiler

200
range(0, max_jint)

product

Start profiling in interpreter if the counters exceed tier 3 thresholds (tier 4 thresholds with CompilationMode=high-only|high-only-quick-internal)by the specified percentage

share/compiler/compiler_globals.hpp

Tier23InlineeNotifyFreqLog

OpenJDK6

intx

compiler

20
range(0, 30)

product

Inlinee invocation (tiers 2 and 3) notification frequency

share/compiler/compiler_globals.hpp

Tier2BackEdgeThreshold

OpenJDK6

intx

compiler

0
range(0, max_jint)

product

Back edge threshold at which tier 2 compilation is invoked

share/compiler/compiler_globals.hpp

Tier2BackedgeNotifyFreqLog

OpenJDK6

intx

compiler

14
range(0, 30)

product

C1 without MDO (tier 2) invocation notification frequency

share/compiler/compiler_globals.hpp

Tier2CompileThreshold

OpenJDK6

intx

compiler

0
range(0, max_jint)

product

threshold at which tier 2 compilation is invoked

share/compiler/compiler_globals.hpp

Tier2InvokeNotifyFreqLog

OpenJDK6

intx

compiler

11
range(0, 30)

product

C1 without MDO (tier 2) invocation notification frequency

share/compiler/compiler_globals.hpp

Tier3AOTBackEdgeThreshold

OpenJDK9

intx

compiler

120000
range(0, max_jint)

product

Back edge threshold at which tier 3 OSR compilation is invoked if coming from AOT

share/compiler/compiler_globals.hpp

Tier3AOTCompileThreshold

OpenJDK9

intx

compiler

15000
range(0, max_jint)

product

Threshold at which tier 3 compilation is invoked (invocation minimum must be satisfied) if coming from AOT

share/compiler/compiler_globals.hpp

Tier3AOTInvocationThreshold

OpenJDK9

intx

compiler

10000
range(0, max_jint)

product

Compile if number of method invocations crosses this threshold if coming from AOT

share/compiler/compiler_globals.hpp

Tier3AOTMinInvocationThreshold

OpenJDK9

intx

compiler

1000
range(0, max_jint)

product

Minimum invocation to compile at tier 3 if coming from AOT

share/compiler/compiler_globals.hpp

Tier3BackEdgeThreshold

OpenJDK6

intx

compiler

60000
range(0, max_jint)

product

Back edge threshold at which tier 3 OSR compilation is invoked

share/compiler/compiler_globals.hpp

Tier3BackedgeNotifyFreqLog

OpenJDK6

intx

compiler

13
range(0, 30)

product

C1 with MDO profiling (tier 3) invocation notification frequency

share/compiler/compiler_globals.hpp

Tier3CompileThreshold

OpenJDK6

intx

compiler

2000
range(0, max_jint)

product

Threshold at which tier 3 compilation is invoked (invocation minimum must be satisfied)

share/compiler/compiler_globals.hpp

Tier3DelayOff

OpenJDK6

intx

compiler

2
range(0, max_jint)

product

If C2 queue size is less than this amount per compiler thread allow methods compiled at tier 2 transition to tier 3

share/compiler/compiler_globals.hpp

Tier3DelayOn

OpenJDK6

intx

compiler

5
range(0, max_jint)

product

If C2 queue size grows over this amount per compiler thread stop compiling at tier 3 and start compiling at tier 2

share/compiler/compiler_globals.hpp

Tier3InvocationThreshold

OpenJDK6

intx

compiler

200
range(0, max_jint)

product

Compile if number of method invocations crosses this threshold

share/compiler/compiler_globals.hpp

Tier3InvokeNotifyFreqLog

OpenJDK6

intx

compiler

10
range(0, 30)

product

C1 with MDO profiling (tier 3) invocation notification frequency

share/compiler/compiler_globals.hpp

Tier3LoadFeedback

OpenJDK6

intx

compiler

5
range(0, max_jint)

product

Tier 3 thresholds will increase twofold when C1 queue size reaches this amount per compiler thread

share/compiler/compiler_globals.hpp

Tier3MinInvocationThreshold

OpenJDK6

intx

compiler

100
range(0, max_jint)

product

Minimum invocation to compile at tier 3

share/compiler/compiler_globals.hpp

Tier40BackEdgeThreshold

OpenJDK14

intx

compiler

15000
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier40CompileThreshold

OpenJDK14

intx

compiler

10000
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier40InvocationThreshold

OpenJDK14

intx

compiler

5000
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier40MinInvocationThreshold

OpenJDK14

intx

compiler

600
range(0, max_jint)

product

DIAGNOSTIC

share/compiler/compiler_globals.hpp

Tier4BackEdgeThreshold

OpenJDK6

intx

compiler

40000
range(0, max_jint)

product

Back edge threshold at which tier 4 OSR compilation is invoked

share/compiler/compiler_globals.hpp

Tier4CompileThreshold

OpenJDK6

intx

compiler

15000
range(0, max_jint)

product

Threshold at which tier 4 compilation is invoked (invocation minimum must be satisfied)

share/compiler/compiler_globals.hpp

Tier4InvocationThreshold

OpenJDK6

intx

compiler

5000
range(0, max_jint)

product

Compile if number of method invocations crosses this threshold

share/compiler/compiler_globals.hpp

Tier4LoadFeedback

OpenJDK6

intx

compiler

3
range(0, max_jint)

product

Tier 4 thresholds will increase twofold when C2 queue size reaches this amount per compiler thread

share/compiler/compiler_globals.hpp

Tier4MinInvocationThreshold

OpenJDK6

intx

compiler

600
range(0, max_jint)

product

Minimum invocation to compile at tier 4

share/compiler/compiler_globals.hpp

TieredCompilation

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

TieredCompilation

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

TieredCompilation

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

TieredCompilation

OpenJDK6

bool

runtime

product_pd

Enable tiered compilation

share/runtime/globals.hpp

TieredCompilation

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

TieredCompilation

OpenJDK6

bool

s390

trueInTiered

define_pd_global

cpu/s390/c2_globals_s390.hpp

TieredCompilation

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c1_globals_x86.hpp

TieredCompileTaskTimeout

OpenJDK6

intx

compiler

50
range(0, max_intx)

product

Kill compile task if method was not used within given timeout in milliseconds

share/compiler/compiler_globals.hpp

TieredRateUpdateMaxTime

OpenJDK6

intx

compiler

25
range(0, max_intx)

product

Maximum rate sampling interval (in milliseconds)

share/compiler/compiler_globals.hpp

TieredRateUpdateMinTime

OpenJDK6

intx

compiler

1
range(0, max_intx)

product

Minimum rate sampling interval (in milliseconds)

share/compiler/compiler_globals.hpp

TieredStopAtLevel

OpenJDK6

intx

compiler

4
range(0, 4)

product

Stop at given compilation level

share/compiler/compiler_globals.hpp

TimeEachLinearScan

OpenJDK6

bool

false

develop

print detailed timing of each LinearScan run

share/c1/c1_globals.hpp

TimeLinearScan

OpenJDK6

bool

false

product

detailed timing of LinearScan phases

share/c1/c1_globals.hpp

TimeOopMap2

OpenJDK6

bool

runtime

false

develop

Time calls to GenerateOopMap::compute_map() individually

share/runtime/globals.hpp

TimeOopMap

OpenJDK6

bool

runtime

false

develop

Time calls to GenerateOopMap::compute_map() in sum

share/runtime/globals.hpp

TraceBytecodesAt

OpenJDK6

intx

runtime

develop

Trace bytecodes starting with specified bytecode number

share/runtime/globals.hpp

TraceBytecodes

OpenJDK6

bool

runtime

false

develop

Trace bytecode execution

share/runtime/globals.hpp

TraceCISCSpill

OpenJDK6

bool

false

notproduct

Trace allocators use of cisc spillable instructions

share/opto/c2_globals.hpp

TraceCallFixup

OpenJDK6

bool

runtime

false

develop

Trace all call fixups

share/runtime/globals.hpp

TraceCodeBlobStacks

OpenJDK6

bool

runtime

false

notproduct

Trace stack-walk of codeblobs

share/runtime/globals.hpp

TraceCompiledIC

OpenJDK6

bool

runtime

false

develop

Trace changes of compiled IC

share/runtime/globals.hpp

TraceCompilerThreads

OpenJDK11

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

TraceCreateZombies

OpenJDK6

bool

runtime

false

develop

trace creation of zombie nmethods

share/runtime/globals.hpp

TraceDeoptimization

OpenJDK6

bool

runtime

false

develop

Trace deoptimization

share/runtime/globals.hpp

TraceDependencies

OpenJDK6

bool

runtime

false

develop

Trace dependencies

share/runtime/globals.hpp

TraceDerivedPointers

OpenJDK6

bool

runtime

false

develop

Trace traversal of derived pointers on stack

share/runtime/globals.hpp

TraceFPURegisterUsage

OpenJDK6

bool

false

develop

Trace usage of FPU registers at start of blocks (intel only)

share/c1/c1_globals.hpp

TraceFPUStack

OpenJDK6

bool

false

develop

Trace emulation of the FPU stack (intel only)

share/c1/c1_globals.hpp

TraceFinalizerRegistration

OpenJDK6

bool

runtime

false

develop

Trace registration of final references

share/runtime/globals.hpp

TraceFrequencyInlining

OpenJDK6

bool

runtime

false

develop

Trace frequency based inlining

share/runtime/globals.hpp

TraceICBuffer

OpenJDK6

bool

runtime

false

develop

Trace usage of IC buffer

share/runtime/globals.hpp

TraceICs

OpenJDK6

bool

runtime

false

develop

Trace inline cache changes

share/runtime/globals.hpp

TraceInlineCacheClearing

OpenJDK6

bool

runtime

false

develop

Trace clearing of inline caches in nmethods

share/runtime/globals.hpp

TraceInvocationCounterOverflow

OpenJDK6

bool

runtime

false

notproduct

Trace method invocation counter overflow

share/runtime/globals.hpp

TraceIterativeGVN

OpenJDK6

bool

false

develop

Print progress during Iterative Global Value Numbering

share/opto/c2_globals.hpp

TraceJVMTI

OpenJDK6

ccstr

runtime

NULL

product

Trace flags for JVMTI functions and events

share/runtime/globals.hpp

TraceJavaAssertions

OpenJDK6

bool

runtime

false

develop

Trace java language assertions

share/runtime/globals.hpp

TraceLinearScanLevel

OpenJDK6

intx

0
range(0, 4)

develop

Debug levels for the linear scan allocator

share/c1/c1_globals.hpp

TraceLivenessGen

OpenJDK6

bool

runtime

false

develop

Trace the generation of liveness analysis information

share/runtime/globals.hpp

TraceLivenessQuery

OpenJDK6

bool

runtime

false

notproduct

Trace queries of liveness analysis information

share/runtime/globals.hpp

TraceLoopLimitCheck

OpenJDK6

bool

false

develop

Trace generation of loop limits checks

share/opto/c2_globals.hpp

TraceLoopOpts

OpenJDK6

bool

false

develop

Trace executed loop optimizations

share/opto/c2_globals.hpp

TraceLoopPredicate

OpenJDK6

bool

false

develop

Trace generation of loop predicates

share/opto/c2_globals.hpp

TraceLoopUnswitching

OpenJDK6

bool

false

notproduct

Trace loop unswitching

share/opto/c2_globals.hpp

TraceMemoryWriteback

OpenJDK14

bool

runtime

false

develop

Trace memory writeback operations

share/runtime/globals.hpp

TraceMethodReplacement

OpenJDK6

bool

runtime

false

develop

Print when methods are replaced do to recompilation

share/runtime/globals.hpp

TraceNewOopMapGenerationDetailed

OpenJDK6

bool

runtime

false

develop

Trace OopMapGeneration: print detailed cell states

share/runtime/globals.hpp

TraceNewOopMapGeneration

OpenJDK6

bool

runtime

false

develop

Trace OopMapGeneration

share/runtime/globals.hpp

TraceNewVectors

OpenJDK7

bool

false

notproduct

Trace creation of Vector nodes

share/opto/c2_globals.hpp

TraceOnStackReplacement

OpenJDK6

bool

runtime

false

notproduct

Trace on stack replacement

share/runtime/globals.hpp

TraceOopMapRewrites

OpenJDK6

bool

runtime

false

develop

Trace rewriting of methods during oop map generation

share/runtime/globals.hpp

TraceOptimizeFill

OpenJDK6

bool

false

develop

print detailed information about fill conversion

share/opto/c2_globals.hpp

TraceOptoOutput

OpenJDK6

bool

false

notproduct

Trace pipelining information

share/opto/c2_globals.hpp

TraceOptoParse

OpenJDK6

bool

false

develop

Trace bytecode parse and control-flow merge

share/opto/c2_globals.hpp

TraceOptoPipelining

OpenJDK6

bool

false

notproduct

Trace pipelining information

share/opto/c2_globals.hpp

TracePartialPeeling

OpenJDK6

bool

false

notproduct

Trace partial peeling (loop rotation) information

share/opto/c2_globals.hpp

TracePatching

OpenJDK6

bool

false

develop

Trace patching of field access on uninitialized classes

share/c1/c1_globals.hpp

TracePcPatching

OpenJDK6

bool

runtime

false

develop

Trace usage of frame::patch_pc

share/runtime/globals.hpp

TracePhaseCCP

OpenJDK6

bool

false

notproduct

Print progress during Conditional Constant Propagation

share/opto/c2_globals.hpp

TracePostallocExpand

OpenJDK8

bool

false

develop

Trace expanding nodes after register allocation.

share/opto/c2_globals.hpp

TracePredicateFailedTraps

OpenJDK8

bool

false

develop

trace runtime traps caused by predicate failure

share/c1/c1_globals.hpp

TraceProfileTripCount

OpenJDK6

bool

false

notproduct

Trace profile loop trip count information

share/opto/c2_globals.hpp

TraceRangeCheckElimination

OpenJDK8

bool

false

develop

Trace Range Check Elimination

share/c1/c1_globals.hpp

TraceRangeLimitCheck

OpenJDK6

bool

false

develop

Trace additional overflow checks in RCE

share/opto/c2_globals.hpp

TraceRelocator

OpenJDK6

bool

runtime

false

develop

Trace the bytecode relocator

share/runtime/globals.hpp

TraceSpilling

OpenJDK6

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

TraceSuperWordLoopUnrollAnalysis

OpenJDK9

bool

false

notproduct

Trace what Superword Level Parallelism analysis applies

share/opto/c2_globals.hpp

TraceSuperWord

OpenJDK6

bool

false

notproduct

Trace superword transforms

share/opto/c2_globals.hpp

TraceSuspendWaitFailures

OpenJDK6

bool

runtime

false

product

Trace external suspend wait failures

share/runtime/globals.hpp

TraceTraps

OpenJDK7

bool

aarch64

false

product

Trace all traps the signal handler

cpu/aarch64/globals_aarch64.hpp

TraceTraps

OpenJDK7

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

TraceTraps

OpenJDK7

bool

s390

false

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

TraceTypeProfile

OpenJDK6

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

TrackedInitializationLimit

OpenJDK6

intx

50
range(0, 65535)

product

When initializing fields, track up to this many words

share/opto/c2_globals.hpp

TrapBasedICMissChecks

OpenJDK7

bool

ppc

true

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

TrapBasedNullChecks

OpenJDK7

bool

aarch64

false

define_pd_global

cpu/aarch64/globals_aarch64.hpp

TrapBasedNullChecks

OpenJDK7

bool

arm

false

define_pd_global

// Not needed

cpu/arm/globals_arm.hpp

TrapBasedNullChecks

OpenJDK7

bool

runtime

product_pd

Generate code for null checks that uses a cmp and trap instruction raising SIGTRAP. This is only used if an access tonull (+offset) will not raise a SIGSEGV, i.e.,ImplicitNullChecks don't work (PPC64).

share/runtime/globals.hpp

TrapBasedNullChecks

OpenJDK7

bool

ppc

true

define_pd_global

cpu/ppc/globals_ppc.hpp

TrapBasedNullChecks

OpenJDK7

bool

s390

true

define_pd_global

cpu/s390/globals_s390.hpp

TrapBasedNullChecks

OpenJDK7

bool

x86

false

define_pd_global

// Not needed on x86.

cpu/x86/globals_x86.hpp

TrapBasedNullChecks

OpenJDK7

bool

zero

false

define_pd_global

cpu/zero/globals_zero.hpp

TrapBasedRangeChecks

OpenJDK7

bool

aarch64

false

define_pd_global

// Not needed.

cpu/aarch64/c2_globals_aarch64.hpp

TrapBasedRangeChecks

OpenJDK7

bool

arm

false

define_pd_global

// Not needed

cpu/arm/c2_globals_arm.hpp

TrapBasedRangeChecks

OpenJDK7

bool

product_pd

Generate code for range checks that uses a cmp and trap instruction raising SIGTRAP. Used on PPC64.

share/opto/c2_globals.hpp

TrapBasedRangeChecks

OpenJDK7

bool

ppc

true

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

TrapBasedRangeChecks

OpenJDK7

bool

s390

false

define_pd_global

// Not needed on z/Architecture.

cpu/s390/c2_globals_s390.hpp

TrapBasedRangeChecks

OpenJDK7

bool

x86

false

define_pd_global

// Not needed on x86.

cpu/x86/c2_globals_x86.hpp

TrustFinalNonStaticFields

OpenJDK6

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

TwoOperandLIRForm

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

TwoOperandLIRForm

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c1_globals_arm.hpp

TwoOperandLIRForm

OpenJDK6

bool

develop_pd

true if LIR requires src1 and dst to match in binary LIR ops

share/c1/c1_globals.hpp

TwoOperandLIRForm

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

TwoOperandLIRForm

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c1_globals_s390.hpp

TwoOperandLIRForm

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

TypeProfileArgsLimit

OpenJDK8

intx

runtime

2
range(0, 16)

product

max number of call arguments to consider for type profiling

share/runtime/globals.hpp

TypeProfileCasts

OpenJDK6

bool

runtime

true

develop

treat casts like calls for purposes of type profiling

share/runtime/globals.hpp

TypeProfileLevel

OpenJDK8

uintx

aarch64

111

define_pd_global

cpu/aarch64/globals_aarch64.hpp

TypeProfileLevel

OpenJDK8

uintx

arm

define_pd_global

cpu/arm/globals_arm.hpp

TypeProfileLevel

OpenJDK8

uintx

runtime

product_pd

=XYZ, with Z: Type profiling of arguments at call; Y: Type profiling of return value at call; X: Type profiling of parameters to methods; X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods

share/runtime/globals.hpp

TypeProfileLevel

OpenJDK8

uintx

ppc

111

define_pd_global

cpu/ppc/globals_ppc.hpp

TypeProfileLevel

OpenJDK8

uintx

s390

111

define_pd_global

cpu/s390/globals_s390.hpp

TypeProfileLevel

OpenJDK8

uintx

x86

111

define_pd_global

cpu/x86/globals_x86.hpp

TypeProfileLevel

OpenJDK8

uintx

zero

define_pd_global

cpu/zero/globals_zero.hpp

TypeProfileMajorReceiverPercent

OpenJDK6

intx

90
range(0, 100)

product

% of major receiver type to all profiled receivers

share/opto/c2_globals.hpp

TypeProfileParmsLimit

OpenJDK8

intx

runtime

2
range(-1, 64)

product

max number of incoming parameters to consider for type profiling, -1 for all

share/runtime/globals.hpp

TypeProfileWidth

OpenJDK6

intx

runtime

2
range(0, 8)

product

Number of receiver types to record in call/cast profile

share/runtime/globals.hpp

UncommonNullCast

OpenJDK6

bool

aarch64

true

define_pd_global

// Uncommon-trap NULLs past to check cast

cpu/aarch64/globals_aarch64.hpp

UncommonNullCast

OpenJDK6

bool

arm

true

define_pd_global

// Uncommon-trap NULLs past to check cast

cpu/arm/globals_arm.hpp

UncommonNullCast

OpenJDK6

bool

runtime

develop_pd

track occurrences of null in casts; adjust compiler tactics

share/runtime/globals.hpp

UncommonNullCast

OpenJDK6

bool

ppc

true

define_pd_global

// Uncommon-trap NULLs passed to check cast.

cpu/ppc/globals_ppc.hpp

UncommonNullCast

OpenJDK6

bool

s390

true

define_pd_global

// Uncommon-trap NULLs passed to check cast.

cpu/s390/globals_s390.hpp

UncommonNullCast

OpenJDK6

bool

x86

true

define_pd_global

// Uncommon-trap NULLs passed to check cast

cpu/x86/globals_x86.hpp

UncommonNullCast

OpenJDK6

bool

zero

true

define_pd_global

cpu/zero/globals_zero.hpp

UnguardOnExecutionViolation

OpenJDK6

intx

runtime

0
range(0, 2)

product

Unguard page and retry on no-execute fault (Win32 only)
0=off, 1=conservative, 2=aggressive

share/runtime/globals.hpp

UnlockDiagnosticVMOptions

OpenJDK6

bool

runtime

trueInDebug

product

DIAGNOSTIC

share/runtime/globals.hpp

UnlockExperimentalVMOptions

OpenJDK6

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

UnrollLimitForProfileCheck

OpenJDK6

intx

1
range(0, max_intx)

develop

Don't use profile_trip_cnt() to restrict unrolling until unrolling would push the number of unrolled iterations above UnrollLimitForProfileCheck. A higher value allows more unrolling. Zero acts as a very large value.

share/opto/c2_globals.hpp

Use64KPagesThreshold

OpenJDK9

uintx

aix

develop

4K/64K page allocation threshold.

os/aix/globals_aix.hpp

Use64KPages

OpenJDK9

bool

aix

true

product

Use 64K pages if available.

os/aix/globals_aix.hpp

UseAESCTRIntrinsics

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseAESIntrinsics

OpenJDK7

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseAES

OpenJDK7

bool

runtime

false

product

Control whether AES instructions are used when available

share/runtime/globals.hpp

UseAOTStrictLoading

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseAOT

OpenJDK9

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

UseAVX

OpenJDK6

intx

x86

3
range(0, 99)

product

Highest supported AVX instructions set on x86/x64

cpu/x86/globals_x86.hpp

UseAdaptiveGenerationSizePolicyAtMajorCollection

OpenJDK6

bool

true

product

Use adaptive young-old sizing policies at major collections

share/gc/shared/gc_globals.hpp

UseAdaptiveGenerationSizePolicyAtMinorCollection

OpenJDK6

bool

true

product

Use adaptive young-old sizing policies at minor collections

share/gc/shared/gc_globals.hpp

UseAdaptiveNUMAChunkSizing

OpenJDK6

bool

runtime

true

product

Enable adaptive chunk sizing for NUMA

share/runtime/globals.hpp

UseAdaptiveSizeDecayMajorGCCost

OpenJDK6

bool

true

product

Adaptive size decays the major cost for long major intervals

share/gc/shared/gc_globals.hpp

UseAdaptiveSizePolicyFootprintGoal

OpenJDK6

bool

true

product

Use adaptive minimum footprint as a goal

share/gc/shared/gc_globals.hpp

UseAdaptiveSizePolicyWithSystemGC

OpenJDK6

bool

false

product

Include statistics from System.gc() for adaptive size policy

share/gc/shared/gc_globals.hpp

UseAdaptiveSizePolicy

OpenJDK6

bool

true

product

Use adaptive generation sizing policies

share/gc/shared/gc_globals.hpp

UseAddressNop

OpenJDK6

bool

x86

false

product

Use '0F 1F [addr]' NOP instructions on x86 cpus

cpu/x86/globals_x86.hpp

UseAdler32Intrinsics

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseBASE64Intrinsics

OpenJDK11

bool

runtime

false

product

Use intrinsics for java.util.Base64

share/runtime/globals.hpp

UseBMI1Instructions

OpenJDK8

bool

x86

false

product

Use BMI1 instructions

cpu/x86/globals_x86.hpp

UseBMI2Instructions

OpenJDK8

bool

x86

false

product

Use BMI2 instructions

cpu/x86/globals_x86.hpp

UseBiasedLocking

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

bool

runtime

false

product

(Deprecated) Enable biased locking in JVM

share/runtime/globals.hpp

UseBimorphicInlining

OpenJDK6

bool

true

product

Profiling based inlining for two receivers

share/opto/c2_globals.hpp

UseBlockZeroing

OpenJDK6

bool

aarch64

true

product

Use DC ZVA for block zeroing

cpu/aarch64/globals_aarch64.hpp

UseBootstrapCallInfo

OpenJDK11

int

runtime

product

DIAGNOSTIC

share/runtime/globals.hpp

UseByteReverseInstruction

OpenJDK9

bool

s390

true

product

DIAGNOSTIC

cpu/s390/globals_s390.hpp

UseByteReverseInstructions

OpenJDK11

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseC1Optimizations

OpenJDK6

bool

true

develop

Turn on C1 optimizations

share/c1/c1_globals.hpp

UseCHA

OpenJDK6

bool

runtime

true

develop

Enable CHA

share/runtime/globals.hpp

UseCISCSpill

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c2_globals_aarch64.hpp

UseCISCSpill

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c2_globals_arm.hpp

UseCISCSpill

OpenJDK6

bool

develop_pd

Use ADLC supplied cisc instructions during allocation

share/opto/c2_globals.hpp

UseCISCSpill

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c2_globals_ppc.hpp

UseCISCSpill

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

UseCISCSpill

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c2_globals_x86.hpp

UseCLMUL

OpenJDK8

bool

x86

false

product

Control whether CLMUL instructions can be used on x86/x64

cpu/x86/globals_x86.hpp

UseCMoveUnconditionally

OpenJDK9

bool

false

product

Use CMove (scalar and vector) ignoring profitability test.

share/opto/c2_globals.hpp

UseCRC32CIntrinsics

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseCRC32Intrinsics

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseCRC32

OpenJDK9

bool

aarch64

false

product

Use CRC32 instructions for CRC32 computation

cpu/aarch64/globals_aarch64.hpp

UseCharacterCompareIntrinsics

OpenJDK11

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseCodeAging

OpenJDK9

bool

runtime

true

product

Insert counter to detect warm methods

share/runtime/globals.hpp

UseCodeCacheFlushing

OpenJDK6

bool

runtime

true

product

Remove cold/old nmethods from the code cache

share/runtime/globals.hpp

UseCompiler

OpenJDK6

bool

runtime

true

product

Use Just-In-Time compilation

share/runtime/globals.hpp

UseCompressedClassPointers

OpenJDK8

bool

runtime

false

product

Use 32-bit class pointers in 64-bit VM. lp64_product means flag is always constant in 32 bit VM

share/runtime/globals.hpp

UseCompressedOops

OpenJDK6

bool

runtime

false

product

Use 32-bit object references in 64-bit VM. lp64_product means flag is always constant in 32 bit VM

share/runtime/globals.hpp

UseCondCardMark

OpenJDK6

bool

false

product

Check for already marked card before updating card table

share/gc/shared/gc_globals.hpp

UseContainerSupport

OpenJDK10

bool

linux

true

product

Enable detection and runtime container configuration support

os/linux/globals_linux.hpp

UseCopySignIntrinsic

OpenJDK16

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseCountLeadingZerosInstruction

OpenJDK6

bool

x86

false

product

Use count leading zeros instruction

cpu/x86/globals_x86.hpp

UseCountLeadingZerosInstructionsPPC64

OpenJDK7

bool

ppc

true

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseCountTrailingZerosInstruction

OpenJDK8

bool

x86

false

product

Use count trailing zeros instruction

cpu/x86/globals_x86.hpp

UseCountTrailingZerosInstructionsPPC64

OpenJDK11

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseCountedLoopSafepoints

OpenJDK7

bool

false

product

Force counted loops to keep a safepoint

share/opto/c2_globals.hpp

UseCounterDecay

OpenJDK6

bool

runtime

true

product

Adjust recompilation counters

share/runtime/globals.hpp

UseCpuAllocPath

OpenJDK9

bool

linux

false

product

DIAGNOSTIC

os/linux/globals_linux.hpp

UseCriticalCompilerThreadPriority

OpenJDK6

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

UseCriticalJavaThreadPriority

OpenJDK6

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

UseDebuggerErgo1

OpenJDK16

bool

runtime

false

notproduct

Debugging Only: Enable workarounds for debugger induced os::processor_id() >= os::processor_count() problems

share/runtime/globals.hpp

UseDebuggerErgo2

OpenJDK16

bool

runtime

false

notproduct

Debugging Only: Limit the number of spawned JVM threads

share/runtime/globals.hpp

UseDebuggerErgo

OpenJDK16

bool

runtime

false

notproduct

Debugging Only: Adjust the VM to be more debugger-friendly. Turns on the other UseDebuggerErgo* flags

share/runtime/globals.hpp

UseDivMod

OpenJDK6

bool

true

product

Use combined DivMod instruction if available

share/opto/c2_globals.hpp

UseDynamicNumberOfCompilerThreads

OpenJDK11

bool

runtime

true

product

Dynamically choose the number of parallel compiler threads

share/runtime/globals.hpp

UseDynamicNumberOfGCThreads

OpenJDK6

bool

true

product

Dynamically choose the number of threads up to a maximum of ParallelGCThreads parallel collectors will use for garbage collection work

share/gc/shared/gc_globals.hpp

UseEmptySlotsInSupers

OpenJDK15

bool

runtime

true

product

Allow allocating fields in empty slots of super-classes

share/runtime/globals.hpp

UseEpsilonGC

OpenJDK11

bool

false

product

EXPERIMENTAL

share/gc/shared/gc_globals.hpp

UseExplicitCommit

OpenJDK9

bool

aix

false

product

Explicit commit for virtual memory.

os/aix/globals_aix.hpp

UseExtendedLoadAndReserveInstructionsPPC64

OpenJDK7

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseFMA

OpenJDK9

bool

runtime

false

product

Control whether FMA instructions are used when available

share/runtime/globals.hpp

UseFPUForSpilling

OpenJDK6

bool

false

product

Spill integer registers to FPU instead of stack when possible

share/opto/c2_globals.hpp

UseFastAccessorMethods

OpenJDK6

bool

zero

true

product

Use fast method entry code for accessor methods

cpu/zero/globals_zero.hpp

UseFastEmptyMethods

OpenJDK6

bool

zero

true

product

Use fast method entry code for empty methods

cpu/zero/globals_zero.hpp

UseFastJNIAccessors

OpenJDK6

bool

runtime

true

product

Use optimized versions of Get<Primitive>Field

share/runtime/globals.hpp

UseFastLocking

OpenJDK6

bool

true

develop

Use fast inlined locking code

share/c1/c1_globals.hpp

UseFastNewInstance

OpenJDK6

bool

true

develop

Use fast inlined instance allocation

share/c1/c1_globals.hpp

UseFastNewObjectArray

OpenJDK6

bool

true

develop

Use fast inlined object array allocation

share/c1/c1_globals.hpp

UseFastNewTypeArray

OpenJDK6

bool

true

develop

Use fast inlined type array allocation

share/c1/c1_globals.hpp

UseFastSignatureHandlers

OpenJDK6

bool

runtime

true

develop

Use fast signature handlers for native calls

share/runtime/globals.hpp

UseFastStosb

OpenJDK7

bool

x86

false

product

Use fast-string operation for zeroing: rep stosb

cpu/x86/globals_x86.hpp

UseFastUnorderedTimeStamps

OpenJDK11

bool

runtime

false

product

EXPERIMENTAL

share/runtime/globals.hpp

UseG1GC

OpenJDK6

bool

false

product

Use the Garbage-First garbage collector

share/gc/shared/gc_globals.hpp

UseGCOverheadLimit

OpenJDK6

bool

true

product

Use policy to limit of proportion of time spent in GC before an OutOfMemory error is thrown

share/gc/shared/gc_globals.hpp

UseGHASHIntrinsics

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseGlobalValueNumbering

OpenJDK6

bool

true

develop

Use Global Value Numbering (separate phase)

share/c1/c1_globals.hpp

UseHeavyMonitors

OpenJDK6

bool

runtime

false

product

use heavyweight instead of lightweight Java monitors

share/runtime/globals.hpp

UseHugeTLBFS

OpenJDK6

Obsoleted in JDK12
Expired in JDK13

bool

linux

false

product

Use MAP_HUGETLB for large pages

os/linux/globals_linux.hpp

UseIncDec

OpenJDK6

bool

x86

true

product

DIAGNOSTIC

cpu/x86/globals_x86.hpp

UseInlineCaches

OpenJDK6

bool

runtime

true

product

Use Inline Caches for virtual calls

share/runtime/globals.hpp

UseInlineDepthForSpeculativeTypes

OpenJDK8

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseInterpreter

OpenJDK6

bool

runtime

true

product

Use interpreter for non-compiled methods

share/runtime/globals.hpp

UseJVMCICompiler

OpenJDK9

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

UseJVMCINativeLibrary

OpenJDK13

bool

jvmci

false

product

EXPERIMENTAL

share/jvmci/jvmci_globals.hpp

UseJumpTables

OpenJDK6

bool

true

product

Use JumpTables instead of a binary search tree for switches

share/opto/c2_globals.hpp

UseLSE

OpenJDK9

bool

aarch64

false

product

Use LSE instructions

cpu/aarch64/globals_aarch64.hpp

UseLargePagesIndividualAllocation

OpenJDK6

bool

aix

false

define_pd_global

os/aix/globals_aix.hpp

UseLargePagesIndividualAllocation

OpenJDK6

bool

bsd

false

define_pd_global

os/bsd/globals_bsd.hpp

UseLargePagesIndividualAllocation

OpenJDK6

bool

linux

false

define_pd_global

os/linux/globals_linux.hpp

UseLargePagesIndividualAllocation

OpenJDK6

bool

runtime

product_pd

Allocate large pages individually for better affinity

share/runtime/globals.hpp

UseLargePagesIndividualAllocation

OpenJDK6

bool

windows

true

define_pd_global

os/windows/globals_windows.hpp

UseLargePages

OpenJDK6

bool

aix

false

define_pd_global

os/aix/globals_aix.hpp

UseLargePages

OpenJDK6

bool

bsd

false

define_pd_global

os/bsd/globals_bsd.hpp

UseLargePages

OpenJDK6

bool

linux

false

define_pd_global

os/linux/globals_linux.hpp

UseLargePages

OpenJDK6

bool

runtime

product_pd

Use large page memory

share/runtime/globals.hpp

UseLargePages

OpenJDK6

bool

windows

false

define_pd_global

os/windows/globals_windows.hpp

UseLibmIntrinsic

OpenJDK9

bool

x86

true

product

DIAGNOSTIC

cpu/x86/globals_x86.hpp

UseLinuxPosixThreadCPUClocks

OpenJDK6

bool

linux

true

product

enable fast Linux Posix clocks where available

os/linux/globals_linux.hpp

UseLoadInstructionsForStackBangingPPC64

OpenJDK7

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseLocalValueNumbering

OpenJDK6

bool

true

develop

Use Local Value Numbering (embedded in GraphBuilder)

share/c1/c1_globals.hpp

UseLoopCounter

OpenJDK6

bool

runtime

true

product

Increment invocation counter on backward branch

share/runtime/globals.hpp

UseLoopInvariantCodeMotion

OpenJDK8

bool

true

product

Simple loop invariant code motion for short loops during GVN

share/c1/c1_globals.hpp

UseLoopPredicate

OpenJDK6

bool

true

product

Generate a predicate to select fast/slow loop versions

share/opto/c2_globals.hpp

UseLoopSafepoints

OpenJDK6

bool

runtime

true

develop

Generate Safepoint nodes in every loop

share/runtime/globals.hpp

UseMD5Intrinsics

OpenJDK16

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseMallocOnly

OpenJDK6

bool

runtime

false

develop

Use only malloc/free for allocation (no resource area/arena)

share/runtime/globals.hpp

UseMathExactIntrinsics

OpenJDK8

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseMaximumCompactionOnSystemGC

OpenJDK6

bool

true

product

Use maximum compaction in the Parallel Old garbage collector for a system GC

share/gc/parallel/parallel_globals.hpp

UseMontgomeryMultiplyIntrinsic

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseMontgomerySquareIntrinsic

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseMulAddIntrinsic

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseMultiplyToLenIntrinsic

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseNUMAInterleaving

OpenJDK6

bool

runtime

false

product

Interleave memory across NUMA nodes if available

share/runtime/globals.hpp

UseNUMA

OpenJDK6

bool

runtime

false

product

Use NUMA if available

share/runtime/globals.hpp

UseNeon

OpenJDK9

bool

aarch64

false

product

Use Neon for CRC32 computation

cpu/aarch64/globals_aarch64.hpp

UseNewCode2

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseNewCode3

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseNewCode

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseNewLongLShift

OpenJDK6

bool

x86

false

product

Use optimized bitwise shift left

cpu/x86/globals_x86.hpp

UseNotificationThread

OpenJDK14

bool

runtime

true

product

Use Notification Thread

share/runtime/globals.hpp

UseOSErrorReporting

OpenJDK6

bool

windows

false

product

Let VM fatal error propagate to the OS (ie. WER on Windows)

os/windows/globals_windows.hpp

UseOnStackReplacement

OpenJDK6

bool

aarch64

true

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

UseOnStackReplacement

OpenJDK6

bool

arm

true

define_pd_global

cpu/arm/c2_globals_arm.hpp

UseOnStackReplacement

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

UseOnStackReplacement

OpenJDK6

bool

runtime

product_pd

Use on stack replacement, calls runtime if invoc. counter overflows in loop

share/runtime/globals.hpp

UseOnStackReplacement

OpenJDK6

bool

ppc

true

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

UseOnStackReplacement

OpenJDK6

bool

s390

true

define_pd_global

cpu/s390/c2_globals_s390.hpp

UseOnStackReplacement

OpenJDK6

bool

x86

true

define_pd_global

cpu/x86/c1_globals_x86.hpp

UseOnlyInlinedBimorphic

OpenJDK6

bool

true

product

Don't use BimorphicInlining if can't inline a second method

share/opto/c2_globals.hpp

UseOprofile

OpenJDK6

Obsoleted in JDK16
Expired in JDK17

bool

linux

false

product

enable support for Oprofile profiler

os/linux/globals_linux.hpp

UseOptoBiasInlining

OpenJDK6

Deprecated in JDK15
Obsoleted in JDK18
Expired in JDK19

bool

true

product

(Deprecated) Generate biased locking code in C2 ideal graph

share/opto/c2_globals.hpp

UsePSAdaptiveSurvivorSizePolicy

OpenJDK6

bool

true

product

Use adaptive survivor sizing policies

share/gc/shared/gc_globals.hpp

UseParallelGC

OpenJDK6

bool

false

product

Use the Parallel garbage collector.

share/gc/shared/gc_globals.hpp

UsePerfData

OpenJDK6

bool

runtime

true

product

Flag to disable jvmstat instrumentation for performance testing and problem isolation purposes

share/runtime/globals.hpp

UsePopCountInstruction

OpenJDK6

bool

runtime

false

product

Use population count instruction

share/runtime/globals.hpp

UsePrivilegedStack

OpenJDK6

bool

runtime

true

develop

Enable the security JVM functions

share/runtime/globals.hpp

UseProfiledLoopPredicate

OpenJDK11

bool

true

product

Move predicates out of loops based on profiling data

share/opto/c2_globals.hpp

UseRTMDeopt

OpenJDK8

bool

ppc

false

product

Perform deopt and recompilation based on RTM abort ratio

cpu/ppc/globals_ppc.hpp

UseRTMDeopt

OpenJDK8

bool

x86

false

product

Perform deopt and recompilation based on RTM abort ratio

cpu/x86/globals_x86.hpp

UseRTMForStackLocks

OpenJDK8

bool

ppc

false

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

UseRTMForStackLocks

OpenJDK8

bool

x86

false

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

UseRTMLocking

OpenJDK8

bool

ppc

false

product

Enable RTM lock eliding for inflated locks in compiled code

cpu/ppc/globals_ppc.hpp

UseRTMLocking

OpenJDK8

bool

x86

false

product

Enable RTM lock eliding for inflated locks in compiled code

cpu/x86/globals_x86.hpp

UseRTMXendForLockBusy

OpenJDK8

bool

ppc

true

product

EXPERIMENTAL

cpu/ppc/globals_ppc.hpp

UseRTMXendForLockBusy

OpenJDK8

bool

x86

true

product

EXPERIMENTAL

cpu/x86/globals_x86.hpp

UseRotateAndMaskInstructionsPPC64

OpenJDK7

bool

ppc

true

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseSHA1Intrinsics

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseSHA256Intrinsics

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseSHA3Intrinsics

OpenJDK16

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseSHA512Intrinsics

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseSHA

OpenJDK8

bool

runtime

false

product

Control whether SHA instructions are used when available

share/runtime/globals.hpp

UseSHM

OpenJDK6

Obsoleted in JDK12
Expired in JDK13

bool

linux

false

product

Use SYSV shared memory for large pages

os/linux/globals_linux.hpp

UseSIGTRAP

OpenJDK7

bool

ppc

true

product

Allow trap instructions that make use of SIGTRAP. Use this to switch off all optimizations requiring SIGTRAP.

cpu/ppc/globals_ppc.hpp

UseSIMDForArrayEquals

OpenJDK11

bool

aarch64

true

product

Use SIMD instructions in generated array equals code

cpu/aarch64/globals_aarch64.hpp

UseSIMDForBigIntegerShiftIntrinsics

OpenJDK16

bool

aarch64

true

product

Use SIMD instructions for left/right shift of BigInteger

cpu/aarch64/globals_aarch64.hpp

UseSIMDForMemoryOps

OpenJDK9

bool

aarch64

false

product

Use SIMD instructions in generated memory move code

cpu/aarch64/globals_aarch64.hpp

UseSSE42Intrinsics

OpenJDK6

bool

x86

false

product

SSE4.2 versions of intrinsics

cpu/x86/globals_x86.hpp

UseSSE

OpenJDK6

Obsoleted in JDK15
Expired in JDK16

intx

x86

99
range(0, 99)

product

Highest supported SSE instructions set on x86/x64

cpu/x86/globals_x86.hpp

UseSVE

OpenJDK16

uint

aarch64

0
range(0, 2)

product

Highest supported SVE instruction set version

cpu/aarch64/globals_aarch64.hpp

UseSerialGC

OpenJDK6

bool

false

product

Use the Serial garbage collector

share/gc/shared/gc_globals.hpp

UseSharedSpaces

OpenJDK6

bool

runtime

true

product

Use shared spaces for metadata

share/runtime/globals.hpp

UseShenandoahGC

OpenJDK12

bool

false

product

Use the Shenandoah garbage collector

share/gc/shared/gc_globals.hpp

UseSignalChaining

OpenJDK6

bool

runtime

true

product

Use signal-chaining to invoke signal handlers installed by the application (Unix only)

share/runtime/globals.hpp

UseSignumIntrinsic

OpenJDK16

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseSimpleArrayEquals

OpenJDK11

bool

aarch64

false

product

Use simpliest and shortest implementation for array equals

cpu/aarch64/globals_aarch64.hpp

UseSlowPath

OpenJDK6

bool

false

develop

For debugging: test slow cases by always using them

share/c1/c1_globals.hpp

UseSquareToLenIntrinsic

OpenJDK8

bool

false

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseStaticBranchPredictionForUncommonPathsPPC64

OpenJDK7

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseStaticBranchPredictionInCompareAndSwapPPC64

OpenJDK7

bool

ppc

true

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseStoreImmI16

OpenJDK6

bool

x86

true

product

Use store immediate 16-bits value instruction on x86

cpu/x86/globals_x86.hpp

UseStringDeduplication

OpenJDK8

bool

runtime

false

product

Use string deduplication

share/runtime/globals.hpp

UseSubwordForMaxVector

OpenJDK10

bool

true

product

Use Subword Analysis to set maximum vector size

share/opto/c2_globals.hpp

UseSuperWord

OpenJDK6

bool

true

product

Transform scalar operations into superword operations

share/opto/c2_globals.hpp

UseSwitchProfiling

OpenJDK11

bool

runtime

true

product

DIAGNOSTIC

share/runtime/globals.hpp

UseTLAB

OpenJDK6

bool

true

product

Use thread-local object allocation

share/gc/shared/tlab_globals.hpp

UseTableRanges

OpenJDK6

bool

true

develop

Faster versions of lookup table using ranges

share/c1/c1_globals.hpp

UseThreadPriorities

OpenJDK6

bool

runtime

product_pd

Use native thread priorities

share/runtime/globals.hpp

UseTransparentHugePages

OpenJDK7

bool

linux

false

product

Use MADV_HUGEPAGE for large pages

os/linux/globals_linux.hpp

UseTypeProfile

OpenJDK6

bool

aarch64

false

define_pd_global

cpu/aarch64/c1_globals_aarch64.hpp

UseTypeProfile

OpenJDK6

bool

arm

false

define_pd_global

cpu/arm/c1_globals_arm.hpp

UseTypeProfile

OpenJDK6

bool

compiler

false

define_pd_global

share/compiler/compiler_globals_pd.hpp

UseTypeProfile

OpenJDK6

bool

runtime

true

product

Check interpreter profile for historically monomorphic calls

share/runtime/globals.hpp

UseTypeProfile

OpenJDK6

bool

ppc

false

define_pd_global

cpu/ppc/c1_globals_ppc.hpp

UseTypeProfile

OpenJDK6

bool

s390

false

define_pd_global

cpu/s390/c1_globals_s390.hpp

UseTypeProfile

OpenJDK6

bool

x86

false

define_pd_global

cpu/x86/c1_globals_x86.hpp

UseTypeSpeculation

OpenJDK8

bool

true

product

Speculatively propagate types from profiles

share/opto/c2_globals.hpp

UseUnalignedAccesses

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseUnalignedLoadStores

OpenJDK6

bool

x86

false

product

Use SSE2 MOVDQU instruction for Arraycopy

cpu/x86/globals_x86.hpp

UseUniqueSubclasses

OpenJDK6

bool

true

develop

Narrow an abstract reference to the unique concrete subclass

share/opto/c2_globals.hpp

UseVectorByteReverseInstructionsPPC64

OpenJDK15

bool

ppc

false

product

DIAGNOSTIC

cpu/ppc/globals_ppc.hpp

UseVectorCmov

OpenJDK10

bool

false

product

Use Vectorized Cmov

share/opto/c2_globals.hpp

UseVectorMacroLogic

OpenJDK15

bool

true

product

DIAGNOSTIC

share/opto/c2_globals.hpp

UseVectorizedMismatchIntrinsic

OpenJDK9

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

UseXMMForArrayCopy

OpenJDK6

bool

runtime

false

product

Use SSE2 MOVQ instruction for Arraycopy

share/runtime/globals.hpp

UseXMMForObjInit

OpenJDK11

bool

x86

false

product

Use XMM/YMM MOVDQU instruction for Object Initialization

cpu/x86/globals_x86.hpp

UseXmmI2D

OpenJDK6

bool

x86

false

product

Use SSE2 CVTDQ2PD instruction to convert Integer to Double

cpu/x86/globals_x86.hpp

UseXmmI2F

OpenJDK6

bool

x86

false

product

Use SSE2 CVTDQ2PS instruction to convert Integer to Float

cpu/x86/globals_x86.hpp

UseXmmLoadAndClearUpper

OpenJDK6

bool

x86

true

product

Load low part of XMM register and clear upper part

cpu/x86/globals_x86.hpp

UseXmmRegToRegMoveAll

OpenJDK6

bool

x86

false

product

Copy all XMM register bits when moving value between registers

cpu/x86/globals_x86.hpp

UseZGC

OpenJDK11

bool

false

product

Use the Z garbage collector

share/gc/shared/gc_globals.hpp

VMThreadPriority

OpenJDK6

intx

runtime

-1
range(-1, 127)

product

The native priority at which the VM thread should run (-1 means no change)

share/runtime/globals.hpp

VMThreadStackSize

OpenJDK6

intx

aix

ppc

2048

define_pd_global

os_cpu/aix_ppc/globals_aix_ppc.hpp

VMThreadStackSize

OpenJDK6

intx

bsd

x86

512

define_pd_global

os_cpu/bsd_x86/globals_bsd_x86.hpp

VMThreadStackSize

OpenJDK6

intx

bsd

zero

512

define_pd_global

os_cpu/bsd_zero/globals_bsd_zero.hpp

VMThreadStackSize

OpenJDK6

intx

linux

aarch64

2048

define_pd_global

os_cpu/linux_aarch64/globals_linux_aarch64.hpp

VMThreadStackSize

OpenJDK6

intx

linux

arm

512

define_pd_global

os_cpu/linux_arm/globals_linux_arm.hpp

VMThreadStackSize

OpenJDK6

intx

linux

ppc

2048

define_pd_global

os_cpu/linux_ppc/globals_linux_ppc.hpp

VMThreadStackSize

OpenJDK6

intx

linux

s390

1024

define_pd_global

os_cpu/linux_s390/globals_linux_s390.hpp

VMThreadStackSize

OpenJDK6

intx

linux

x86

512

define_pd_global

os_cpu/linux_x86/globals_linux_x86.hpp

VMThreadStackSize

OpenJDK6

intx

linux

zero

512

define_pd_global

os_cpu/linux_zero/globals_linux_zero.hpp

VMThreadStackSize

OpenJDK6

intx

runtime

product_pd

Non-Java Thread Stack Size (in Kbytes)

share/runtime/globals.hpp

VMThreadStackSize

OpenJDK6

intx

windows

aarch64

define_pd_global

os_cpu/windows_aarch64/globals_windows_aarch64.hpp

VMThreadStackSize

OpenJDK6

intx

windows

x86

define_pd_global

// 0 => use system default

os_cpu/windows_x86/globals_windows_x86.hpp

ValueMapInitialSize

OpenJDK6

intx

11
range(1, NOT_LP64(1*K) LP64_ONLY(32*K))

product

Initial size of a value map

share/c1/c1_globals.hpp

ValueMapMaxLoopSize

OpenJDK6

intx

8
range(0, 128)

product

maximum size of a loop optimized by global value numbering

share/c1/c1_globals.hpp

ValueSearchLimit

OpenJDK6

intx

1000
range(0, max_jint)

product

Recursion limit in PhaseMacroExpand::value_from_mem_phi

share/opto/c2_globals.hpp

Verbose

OpenJDK6

bool

runtime

false

develop

Print additional debugging information from other modes

share/runtime/globals.hpp

VerifyActivationFrameSize

OpenJDK6

bool

runtime

false

develop

Verify that activation frame didn't become smaller than its minimal size

share/runtime/globals.hpp

VerifyAdapterCalls

OpenJDK7

bool

runtime

trueInDebug

product

DIAGNOSTIC

share/runtime/globals.hpp

VerifyAdapterSharing

OpenJDK6

bool

runtime

false

develop

Verify that the code for shared adapters is the equivalent

share/runtime/globals.hpp

VerifyAfterGC

OpenJDK6

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyAliases

OpenJDK6

bool

false

develop

perform extra checks on the results of alias analysis

share/opto/c2_globals.hpp

VerifyArchivedFields

OpenJDK16

bool

trueInDebug

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyBeforeExit

OpenJDK6

bool

trueInDebug

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyBeforeGC

OpenJDK6

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyBeforeIteration

OpenJDK6

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

VerifyCodeCache

OpenJDK9

bool

runtime

false

notproduct

Verify code cache on memory allocation/deallocation

share/runtime/globals.hpp

VerifyConnectionGraph

OpenJDK7

bool

true

notproduct

Verify Connection Graph construction in Escape Analysis

share/opto/c2_globals.hpp

VerifyCrossModifyFence

OpenJDK16

bool

runtime

false AARCH64_ONLY(DEBUG_ONLY(||true))

develop

Mark all threads after a safepoint, and clear on a modify fence. Add cleanliness checks.

share/runtime/globals.hpp

VerifyDUIterators

OpenJDK6

bool

true

notproduct

Verify the safety of all iterations of Bi-directional Edges

share/opto/c2_globals.hpp

VerifyDataPointer

OpenJDK6

bool

runtime

trueInDebug

develop

Verify the method data pointer during interpreter profiling

share/runtime/globals.hpp

VerifyDependencies

OpenJDK6

bool

runtime

trueInDebug

develop

Exercise and verify the compilation dependency mechanism

share/runtime/globals.hpp

VerifyDuringGC

OpenJDK6

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyDuringStartup

OpenJDK7

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyFPU

OpenJDK6

bool

runtime

false

develop

Verify FPU state (check for NaN's, etc.)

share/runtime/globals.hpp

VerifyGCLevel

OpenJDK6

intx

0
range(0, 1)

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyGCStartAt

OpenJDK6

uintx

0
range(0, max_uintx)

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyGCType

OpenJDK10

ccstrlist

DIAGNOSTIC

product

GC type(s) to verify when Verify*GC is enabled.Available types are collector specific.

share/gc/shared/gc_globals.hpp

VerifyGraphEdges

OpenJDK6

bool

false

notproduct

Verify Bi-directional Edges

share/opto/c2_globals.hpp

VerifyHashTableKeys

OpenJDK6

bool

true

notproduct

Verify the immutability of keys in the VN hash tables

share/opto/c2_globals.hpp

VerifyIdealNodeCount

OpenJDK7

bool

false

notproduct

Verify that tracked dead ideal node count is accurate

share/opto/c2_globals.hpp

VerifyIterativeGVN

OpenJDK6

bool

false

develop

Verify Def-Use modifications during sparse Iterative Global Value Numbering

share/opto/c2_globals.hpp

VerifyJNIEnvThread

OpenJDK6

bool

runtime

false

notproduct

Verify JNIEnv.thread == Thread::current() when entering VM from JNI

share/runtime/globals.hpp

VerifyJNIFields

OpenJDK6

bool

runtime

trueInDebug

develop

Verify jfieldIDs for instance fields

share/runtime/globals.hpp

VerifyLastFrame

OpenJDK6

bool

runtime

false

notproduct

Verify oops on last frame on entry to VM

share/runtime/globals.hpp

VerifyLoopOptimizations

OpenJDK6

bool

false

notproduct

verify major loop optimizations

share/opto/c2_globals.hpp

VerifyMetaspaceInterval

OpenJDK13

int

runtime

DEBUG_ONLY(500) NOT_DEBUG(0)

develop

Run periodic metaspace verifications (0 - none,
1 - always, >1 every nth interval)

share/runtime/globals.hpp

VerifyMethodHandles

OpenJDK6

bool

runtime

trueInDebug

product

DIAGNOSTIC

share/runtime/globals.hpp

VerifyObjectStartArray

OpenJDK6

bool

true

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifyOops

OpenJDK6

bool

runtime

false

develop

Do plausibility checks for oops

share/runtime/globals.hpp

VerifyRegisterAllocator

OpenJDK6

bool

false

notproduct

Verify Register Allocator

share/opto/c2_globals.hpp

VerifyRememberedSets

OpenJDK6

bool

false

product

DIAGNOSTIC

share/gc/shared/gc_globals.hpp

VerifySharedSpaces

OpenJDK8

bool

runtime

false

product

Verify integrity of shared spaces

share/runtime/globals.hpp

VerifyStackAtCalls

OpenJDK6

bool

runtime

false

develop

Verify that the stack pointer is unchanged after calls

share/runtime/globals.hpp

VerifyStack

OpenJDK6

bool

runtime

false

develop

Verify stack of each thread when it is entering a runtime call

share/runtime/globals.hpp

VerifyStringTableAtExit

OpenJDK8

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

VerifySubSet

OpenJDK8

ccstrlist

DIAGNOSTIC

product

Memory sub-systems to verify when Verify*GC flag(s) are enabled. One or more sub-systems can be specified in a comma separated string. Sub-systems are: threads, heap, symbol_table, string_table, codecache, dictionary, classloader_data_graph, metaspace, jni_handles, codecache_oops

share/gc/shared/gc_globals.hpp

VerifyThread

OpenJDK6

bool

runtime

false

develop

Watch the thread register for corruption (SPARC only)

share/runtime/globals.hpp

WalkStackALot

OpenJDK6

bool

runtime

false

notproduct

Trace stack (no print) at every exit from the runtime system

share/runtime/globals.hpp

WarmCallMaxSize

OpenJDK6

intx

999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

size of the largest inlinable method

share/opto/c2_globals.hpp

WarmCallMaxWork

OpenJDK6

intx

999999
range(0, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

execution time of the largest inlinable method

share/opto/c2_globals.hpp

WarmCallMinCount

OpenJDK6

intx

-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

number of calls (per method invocation) to enable inlining

share/opto/c2_globals.hpp

WarmCallMinProfit

OpenJDK6

intx

-1
range(-1, ((intx)MIN2((int64_t)max_intx,(int64_t)(+1.0e10))))

develop

number of calls (per method invocation) to enable inlining

share/opto/c2_globals.hpp

WhiteBoxAPI

OpenJDK7

bool

runtime

false

product

DIAGNOSTIC

share/runtime/globals.hpp

WizardMode

OpenJDK6

bool

runtime

false

develop

Print much more debugging information

share/runtime/globals.hpp

WorkStealingHardSpins

OpenJDK6

uintx

4096

product

EXPERIMENTAL

share/gc/shared/gc_globals.hpp

WorkStealingSleepMillis

OpenJDK6

uintx

product

EXPERIMENTAL

share/gc/shared/gc_globals.hpp

WorkStealingSpinToYieldRatio

OpenJDK6

uintx

product

EXPERIMENTAL

share/gc/shared/gc_globals.hpp

WorkStealingYieldsBeforeSleep

OpenJDK6

uintx

5000

product

EXPERIMENTAL

share/gc/shared/gc_globals.hpp

YoungGenerationSizeIncrement

OpenJDK6

uintx

20
range(0, 100)

product

Adaptive size percentage change in young generation

share/gc/shared/gc_globals.hpp

YoungGenerationSizeSupplementDecay

OpenJDK6

uintx

8
range(1, max_uintx)

product

Decay factor to YoungedGenerationSizeSupplement

share/gc/shared/gc_globals.hpp

YoungGenerationSizeSupplement

OpenJDK6

uintx

80
range(0, 100)

product

Supplement to YoungedGenerationSizeIncrement used at startup

share/gc/shared/gc_globals.hpp

YoungPLABSize

OpenJDK6

size_t

4096

product

Size of young gen promotion LAB's (in HeapWords)

share/gc/shared/tlab_globals.hpp

ZAllocationSpikeTolerance

OpenJDK11

double

2.0

product

Allocation spike tolerance factor

share/gc/z/z_globals.hpp

ZCollectionInterval

OpenJDK11

double

product

Force GC at a fixed time interval (in seconds)

share/gc/z/z_globals.hpp

ZFragmentationLimit

OpenJDK11

double

25.0

product

Maximum allowed heap fragmentation

share/gc/z/z_globals.hpp

ZMarkStackSpaceLimit

OpenJDK12

size_t

8*G
range(32*M, 1024*G)

product

Maximum number of bytes allocated for mark stacks

share/gc/z/z_globals.hpp

ZProactive

OpenJDK11

bool

true

product

Enable proactive GC cycles

share/gc/z/z_globals.hpp

ZStatisticsInterval

OpenJDK11

uint

10
range(1, (uint)-1)

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZStressRelocateInPlace

OpenJDK16

bool

false

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZUncommitDelay

OpenJDK13

uintx

5 * 60

product

Uncommit memory if it has been unused for the specified amount of time (in seconds)

share/gc/z/z_globals.hpp

ZUncommit

OpenJDK13

bool

true

product

Uncommit unused memory

share/gc/z/z_globals.hpp

ZVerifyForwarding

OpenJDK11

bool

false

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZVerifyMarking

OpenJDK11

bool

trueInDebug

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZVerifyObjects

OpenJDK13

bool

false

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZVerifyRoots

OpenJDK13

bool

trueInDebug

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZVerifyViews

OpenJDK13

bool

false

product

DIAGNOSTIC

share/gc/z/z_globals.hpp

ZapEmptyStackFields

OpenJDK9

bool

s390

false

develop

Write 0x0101... to empty stack fields. Use this to ease stack debugging.

cpu/s390/globals_s390.hpp

ZapFillerObjects

OpenJDK6

bool

runtime

trueInDebug

develop

Zap filler objects with 0xDEAFBABE

share/runtime/globals.hpp

ZapMemory

OpenJDK7

bool

ppc

false

develop

Write 0x0101... to empty memory. Use this to ease debugging.

cpu/ppc/globals_ppc.hpp

ZapResourceArea

OpenJDK6

bool

runtime

trueInDebug

develop

Zap freed resource/arena space with 0xABABABAB

share/runtime/globals.hpp

ZapStackSegments

OpenJDK6

bool

runtime

trueInDebug

notproduct

Zap allocated/freed stack segments with 0xFADFADED

share/runtime/globals.hpp

ZapUnusedHeapArea

OpenJDK6

bool

runtime

trueInDebug

develop

Zap unused heap space with 0xBAADBABE

share/runtime/globals.hpp

ZapVMHandleArea

OpenJDK6

bool

runtime

trueInDebug

notproduct

Zap freed VM handle space with 0xBCBCBCBC

share/runtime/globals.hpp

ZeroTLAB

OpenJDK6

bool

false

product

Zero out the newly created TLAB

share/gc/shared/tlab_globals.hpp

ZombieALotInterval

OpenJDK6

intx

runtime

notproduct

Number of exits until ZombieALot kicks in

share/runtime/globals.hpp

ZombieALot

OpenJDK6

bool

runtime

false

notproduct

Create zombies (non-entrant) at exit from the runtime system

share/runtime/globals.hpp

batch

OpenJDK6

disable background compilation

launcher.properties

bootclasspath/a

OpenJDK6

append to end of bootstrap class path

launcher.properties

check:jni

OpenJDK6

perform additional checks for JNI functions

launcher.properties

comp

OpenJDK13

forces compilation of methods on first invocation

launcher.properties

debug

OpenJDK13

does nothing. Provided for backward compatibility.

launcher.properties

diag

OpenJDK13

show additional diagnostic messages

launcher.properties

future

OpenJDK6

enable strictest checks, anticipating future default. This option is deprecated and may be removed in a future release.

launcher.properties

hashCode

OpenJDK6

intx

runtime

product

EXPERIMENTAL

share/runtime/globals.hpp

int

OpenJDK6

interpreted mode execution only

launcher.properties

internalversion

OpenJDK13

displays more detailed JVM version information than the -version option

launcher.properties

log

OpenJDK9

<opts>

Configure or enable logging with the Java Virtual Machine (JVM) unified logging framework. Use -Xlog:help for details.

launcher.properties

loggc

OpenJDK6

<file>

log GC status to a file with time stamps. This option is deprecated and may be removed in a future release. It is replaced by -Xlog:gc:<file>.

launcher.properties

mixed

OpenJDK6

mixed mode execution (default)

launcher.properties

OpenJDK13

<size>

sets the initial and maximum size (in bytes) of the heap for the young generation (nursery)

launcher.properties

OpenJDK6

<size>

set initial Java heap size

launcher.properties

OpenJDK6

<size>

set maximum Java heap size

launcher.properties

noclassgc

OpenJDK6

disable class garbage collection

launcher.properties

OpenJDK6

reduce use of OS signals by Java/VM (see documentation)

launcher.properties

share:auto

OpenJDK6

use shared class data if possible (default)

launcher.properties

share:off

OpenJDK6

do not attempt to use shared class data

launcher.properties

share:on

OpenJDK6

require using shared class data, otherwise fail. This is a testing option and may lead to intermittent failures. It should not be used in production environments.

launcher.properties

showSettings:all

OpenJDK13

show all settings and continue

launcher.properties

showSettings:locale

OpenJDK13

show all locale related settings and continue

launcher.properties

showSettings:properties

OpenJDK13

show all property settings and continue

launcher.properties

showSettings:system

OpenJDK13

(Linux Only) show host system or container configuration and continue

launcher.properties

showSettings:vm

OpenJDK13

show all vm related settings and continue

launcher.properties

showSettings

OpenJDK13

show all settings and continue

launcher.properties

OpenJDK6

<size>

set java thread stack size

launcher.properties

verify

OpenJDK13

sets the mode of the bytecode verifier
Note that option -Xverify:none is deprecated and
may be removed in a future release.

launcher.properties