"-XX:+PrintFlagsFinal" - Print JVM Options

Java GC Tutorials - Herong's Tutorial Examples

∟"-XX:+PrintFlagsFinal" - Print JVM Options

This section describes the '-XX:+PrintFlagsFinal' JVM option, which prints all options and their values used by the JVM.

If want to know what are default options used by the JVM, you can use the "-XX:+PrintFlagsFinal" option to print them out:

herong> java -XX:+PrintFlagsFinal GarbageCollection

[Global flags]
ccstrlist AOTLibrary                               =
      int ActiveProcessorCount                     = -1
    uintx AdaptiveSizeDecrementScaleFactor         = 4
    uintx AdaptiveSizeMajorGCDecayTimeScale        = 10
    uintx AdaptiveSizePolicyCollectionCostMargin   = 50
    uintx AdaptiveSizePolicyInitializingSteps      = 20
    uintx AdaptiveSizePolicyOutputInterval         = 0
    uintx AdaptiveSizePolicyWeight                 = 10
    uintx AdaptiveSizeThroughPutPolicy             = 0
    uintx AdaptiveTimeWeight                       = 25
     bool AggressiveHeap                           = false
     intx AliasLevel                               = 3
     bool AlignVector                              = false
    ccstr AllocateHeapAt                           =
     intx AllocateInstancePrefetchLines            = 1
     intx AllocatePrefetchDistance                 = 192
     intx AllocatePrefetchInstr                    = 3
     intx AllocatePrefetchLines                    = 4
     intx AllocatePrefetchStepSize                 = 64
     intx AllocatePrefetchStyle                    = 1
     bool AllowJNIEnvProxy                         = false
     bool AllowParallelDefineClass                 = false
     bool AllowUserSignalHandlers                  = false
     bool AllowVectorizeOnDemand                   = true
     bool AlwaysActAsServerClassMachine            = false
     bool AlwaysCompileLoopMethods                 = false
     bool AlwaysLockClassLoader                    = false
     bool AlwaysPreTouch                           = false
     bool AlwaysRestoreFPU                         = false
     bool AlwaysTenure                             = false
     intx ArrayCopyLoadStoreMaxElem                = 8
     bool AssertOnSuspendWaitFailure               = false
     intx AutoBoxCacheMax                          = 128
     intx BCEATraceLevel                           = 0
     bool BackgroundCompilation                    = true
   size_t BaseFootPrintEstimate                    = 268435456
     intx BiasedLockingBulkRebiasThreshold         = 20
     intx BiasedLockingBulkRevokeThreshold         = 40
     intx BiasedLockingDecayTime                   = 25000
     intx BiasedLockingStartupDelay                = 0
     bool BindGCTaskThreadsToCPUs                  = false
     bool BlockLayoutByFrequency                   = true
     intx BlockLayoutMinDiamondPercentage          = 20
     bool BlockLayoutRotateLoops                   = true
     bool BranchOnRegister                         = false
     bool BytecodeVerificationLocal                = false
     bool BytecodeVerificationRemote               = true
     bool C1OptimizeVirtualCallProfiling           = true
     bool C1ProfileBranches                        = true
   ...