GraalVM

提示

这些参数只适合 GraalVM EE

基础参数

 -XX:+UseG1GC -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=28 -XX:G1MaxNewSizePercent=50 -XX:G1HeapRegionSize=16M -XX:G1ReservePercent=15 -XX:G1MixedGCCountTarget=3 -XX:InitiatingHeapOccupancyPercent=20 -XX:G1MixedGCLiveThresholdPercent=90 -XX:SurvivorRatio=32 -XX:G1HeapWastePercent=5 -XX:MaxTenuringThreshold=1 -XX:+PerfDisableSharedMem -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:+UseNUMA -XX:-DontCompileHugeMethods -XX:MaxNodeLimit=240000 -XX:NodeLimitFudgeFactor=8000 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:NmethodSweepActivity=1 -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:AllocatePrefetchStyle=3 -XX:+AlwaysActAsServerClassMachine -XX:+EagerJVMCI -XX:+UseStringDeduplication -XX:+UseAES -XX:+UseAESIntrinsics -XX:+UseFMA -XX:+UseLoopPredicate -XX:+RangeCheckElimination -XX:+OptimizeStringConcat -XX:+UseThreadPriorities -XX:+OmitStackTraceInFastThrow -XX:+RewriteBytecodes -XX:+RewriteFrequentPairs -XX:+UseFPUForSpilling -XX:+UseFastStosb -XX:+UseNewLongLShift -XX:+UseVectorCmov -XX:+UseXMMForArrayCopy -XX:+UseXmmI2D -XX:+UseXmmI2F -XX:+UseXmmLoadAndClearUpper -XX:+UseXmmRegToRegMoveAll -XX:+EliminateLocks -XX:+DoEscapeAnalysis -XX:+AlignVector -XX:+OptimizeFill -XX:+EnableVectorSupport -XX:+UseCharacterCompareIntrinsics -XX:+UseCopySignIntrinsic -XX:+UseVectorStubs -XX:UseAVX=2 -XX:UseSSE=4 -XX:+UseFastJNIAccessors -XX:+UseInlineCaches -XX:+SegmentedCodeCache -Djdk.nio.maxCachedBufferSize=262144 -Dgraal.UsePriorityInlining=true -Dgraal.Vectorization=true -Dgraal.OptDuplication=true -Dgraal.DetectInvertedLoopsAsCounted=true  -Dgraal.LoopInversion=true -Dgraal.VectorizeHashes=true -Dgraal.EnterprisePartialUnroll=true -Dgraal.VectorizeSIMD=true -Dgraal.StripMineNonCountedLoops=true  -Dgraal.SpeculativeGuardMovement=true -Dgraal.TuneInlinerExploration=1 -Dgraal.LoopRotation=true -Dgraal.OptWriteMotion=true -Dgraal.WriteableCodeCache=true -Dgraal.CompilerConfiguration=enterprise 

ZGC

GraalVM 不适合使用 ZGC,会导致重要优化被禁用

正在考虑的flag

更激进的内联，在 Graal 中通过-Dgraal.BaseTargetSpending=160(默认为 120)和 OpenJDK 中的其他一些标志。具有较大缓存的 CPU 可能会从中受益