【JVM系列】OpenJDK8 JVM参数初始值

java -XX:+PrintFlagsInitial

[Global flags]
     intx ActiveProcessorCount                      = -1                                  {product}
    uintx AdaptiveSizeDecrementScaleFactor          = 4                                   {product}
    uintx AdaptiveSizeMajorGCDecayTimeScale         = 10                                  {product}
    uintx AdaptiveSizePausePolicy                   = 0                                   {product}
    uintx AdaptiveSizePolicyCollectionCostMargin    = 50                                  {product}
    uintx AdaptiveSizePolicyInitializingSteps       = 20                                  {product}
    uintx AdaptiveSizePolicyOutputInterval          = 0                                   {product}
    uintx AdaptiveSizePolicyWeight                  = 10                                  {product}
    uintx AdaptiveSizeThroughPutPolicy              = 0                                   {product}
    uintx AdaptiveTimeWeight                        = 25                                  {product}
     bool AdjustConcurrency                         = false                               {product}
     bool AggressiveHeap                            = false                               {product}
     bool AggressiveOpts                            = false                               {product}
     intx AliasLevel                                = 3                                   {C2 product}
     bool AlignVector                               = true                                {C2 product}
     intx AllocateInstancePrefetchLines             = 1                                   {product}
     intx AllocatePrefetchDistance                  = -1                                  {product}
     intx AllocatePrefetchInstr                     = 0                                   {product}
     intx AllocatePrefetchLines                     = 3                                   {product}
     intx AllocatePrefetchStepSize                  = 16                                  {product}
     intx AllocatePrefetchStyle                     = 1                                   {product}
     bool AllowJNIEnvProxy                          = false                               {product}
     bool AllowNonVirtualCalls                      = false                               {product}
     bool AllowParallelDefineClass                  = false                               {product}
     bool AllowUserSignalHandlers                   = false                               {product}
     bool AlwaysActAsServerClassMachine             = false                               {product}
     bool AlwaysCompileLoopMethods                  = false                               {product}
     bool AlwaysLockClassLoader                     = false                               {product}
     bool AlwaysPreTouch                            = false                               {product}
     bool AlwaysRestoreFPU                          = false                               {product}
     bool AlwaysTenure                              = false                               {product}
     bool AssertOnSuspendWaitFailure                = false                               {product}
     bool AssumeMP                                  = false                               {product}
     intx AutoBoxCacheMax                           = 128                                 {C2 product}
    uintx AutoGCSelectPauseMillis                   = 5000                                {product}
     intx BCEATraceLevel                            = 0                                   {product}
     intx BackEdgeThreshold                         = 100000                              {pd product}
     bool BackgroundCompilation                     = true                                {pd product}
    uintx BaseFootPrintEstimate                     = 268435456                           {product}
     intx BiasedLockingBulkRebiasThreshold          = 20                                  {product}
     intx BiasedLockingBulkRevokeThreshold          = 40                                  {product}
     intx BiasedLockingDecayTime                    = 25000                               {product}
     intx BiasedLockingStartupDelay                 = 4000                                {product}
     bool BindGCTaskThreadsToCPUs                   = false                               {product}
     bool BlockLayoutByFrequency                    = true                                {C2 product}
     intx BlockLayoutMinDiamondPercentage           = 20                                  {C2 product}
     bool BlockLayoutRotateLoops                    = true                                {C2 product}
     bool BranchOnRegister                          = false                               {C2 product}
     bool BytecodeVerificationLocal                 = false                               {product}
     bool BytecodeVerificationRemote                = true                                {product}
     bool C1OptimizeVirtualCallProfiling            = true                                {C1 product}
     bool C1ProfileBranches                         = true                                {C1 product}
     bool C1ProfileCalls                            = true                                {C1 product}
     bool C1ProfileCheckcasts                       = true                                {C1 product}
     bool C1ProfileInlinedCalls                     = true                                {C1 product}
     bool C1ProfileVirtualCalls                     = true                                {C1 product}
     bool C1UpdateMethodData                        = true                                {C1 product}
     intx CICompilerCount                           = 2                                   {product}
     bool CICompilerCountPerCPU                     = false                               {product}
     bool CITime                                    = false                               {product}
     bool CMSAbortSemantics                         = false                               {product}
    uintx CMSAbortablePrecleanMinWorkPerIteration   = 100                                 {product}
     intx CMSAbortablePrecleanWaitMillis            = 100                                 {manageable}
    uintx CMSBitMapYieldQuantum                     = 10485760                            {product}
    uintx CMSBootstrapOccupancy                     = 50                                  {product}
     bool CMSClassUnloadingEnabled                  = true                                {product}
    uintx CMSClassUnloadingMaxInterval              = 0                                   {product}
     bool CMSCleanOnEnter                           = true                                {product}
     bool CMSCompactWhenClearAllSoftRefs            = true                                {product}
    uintx CMSConcMarkMultiple                       = 32                                  {product}
     bool CMSConcurrentMTEnabled                    = true                                {product}
    uintx CMSCoordinatorYieldSleepCount             = 10                                  {product}
     bool CMSDumpAtPromotionFailure                 = false                               {product}
     bool CMSEdenChunksRecordAlways                 = true                                {product}
    uintx CMSExpAvgFactor                           = 50                                  {product}
     bool CMSExtrapolateSweep                       = false                               {product}
    uintx CMSFullGCsBeforeCompaction                = 0                                   {product}
    uintx CMSIncrementalDutyCycle                   = 10                                  {product}
    uintx CMSIncrementalDutyCycleMin                = 0                                   {product}
     bool CMSIncrementalMode                        = false                               {product}
    uintx CMSIncrementalOffset                      = 0                                   {product}
     bool CMSIncrementalPacing                      = true                                {product}
    uintx CMSIncrementalSafetyFactor                = 10                                  {product}
    uintx CMSIndexedFreeListReplenish               = 4                                   {product}
     intx CMSInitiatingOccupancyFraction            = -1                                  {product}
    uintx CMSIsTooFullPercentage                    = 98                                  {product}
   double CMSLargeCoalSurplusPercent                = 0.950000                            {product}
   double CMSLargeSplitSurplusPercent               = 1.000000                            {product}
     bool CMSLoopWarn                               = false                               {product}
    uintx CMSMaxAbortablePrecleanLoops              = 0                                   {product}
     intx CMSMaxAbortablePrecleanTime               = 5000                                {product}
    uintx CMSOldPLABMax                             = 1024                                {product}
    uintx CMSOldPLABMin                             = 16                                  {product}
    uintx CMSOldPLABNumRefills                      = 4                                   {product}
    uintx CMSOldPLABReactivityFactor                = 2                                   {product}
     bool CMSOldPLABResizeQuicker                   = false                               {product}
    uintx CMSOldPLABToleranceFactor                 = 4                                   {product}
     bool CMSPLABRecordAlways                       = true                                {product}
    uintx CMSParPromoteBlocksToClaim                = 16                                  {product}
     bool CMSParallelInitialMarkEnabled             = true                                {product}
     bool CMSParallelRemarkEnabled                  = true                                {product}
     bool CMSParallelSurvivorRemarkEnabled          = true                                {product}
    uintx CMSPrecleanDenominator                    = 3                                   {product}
    uintx CMSPrecleanIter                           = 3                                   {product}
    uintx CMSPrecleanNumerator                      = 2                                   {product}
     bool CMSPrecleanRefLists1                      = true                                {product}
     bool CMSPrecleanRefLists2                      = false                               {product}
     bool CMSPrecleanSurvivors1                     = false                               {product}
     bool CMSPrecleanSurvivors2                     = true                                {product}
    uintx CMSPrecleanThreshold                      = 1000                                {product}
     bool CMSPrecleaningEnabled                     = true                                {product}
     bool CMSPrintChunksInDump                      = false                               {product}
     bool CMSPrintEdenSurvivorChunks                = false                               {product}
     bool CMSPrintObjectsInDump                     = false                               {product}
    uintx CMSRemarkVerifyVariant                    = 1                                   {product}
     bool CMSReplenishIntermediate                  = true                                {product}
    uintx CMSRescanMultiple                         = 32                                  {product}
    uintx CMSSamplingGrain                          = 16384                               {product}
     bool CMSScavengeBeforeRemark                   = false                               {product}
    uintx CMSScheduleRemarkEdenPenetration          = 50                                  {product}
    uintx CMSScheduleRemarkEdenSizeThreshold        = 2097152                             {product}
    uintx CMSScheduleRemarkSamplingRatio            = 5                                   {product}
   double CMSSmallCoalSurplusPercent                = 1.050000                            {product}
   double CMSSmallSplitSurplusPercent               = 1.100000                            {product}
     bool CMSSplitIndexedFreeListBlocks             = true                                {product}
     intx CMSTriggerInterval                        = -1                                  {manageable}
    uintx CMSTriggerRatio                           = 80                                  {product}
     intx CMSWaitDuration                           = 2000                                {manageable}
    uintx CMSWorkQueueDrainThreshold                = 10                                  {product}
     bool CMSYield                                  = true                                {product}
    uintx CMSYieldSleepCount                        = 0                                   {product}
    uintx CMSYoungGenPerWorker                      = 67108864                            {pd product}
    uintx CMS_FLSPadding                            = 1                                   {product}
    uintx CMS_FLSWeight                             = 75                                  {product}
    uintx CMS_SweepPadding                          = 1                                   {product}
    uintx CMS_SweepTimerThresholdMillis             = 10                                  {product}
    uintx CMS_SweepWeight                           = 75                                  {product}
     bool CheckEndorsedAndExtDirs                   = false                               {product}
     bool CheckJNICalls                             = false                               {product}
     bool ClassUnloading                            = true                                {product}
     bool ClassUnloadingWithConcurrentMark          = true                                {product}
     intx ClearFPUAtPark                            = 0                                   {product}
     bool ClipInlining                              = true                                {product}
    uintx CodeCacheExpansionSize                    = 65536                               {pd product}
    uintx CodeCacheMinimumFreeSpace                 = 512000                              {product}
     bool CollectGen0First                          = false                               {product}
     bool CompactFields                             = true                                {product}
     intx CompilationPoli