Split log4j and JVM flags handling out of start-finalExec (#4372)

scripts/start-finalExec-jvmFlags

@@ -0,0 +1,206 @@
+#!/bin/bash
+
+: "${USE_AIKAR_FLAGS:=false}"
+: "${USE_MEOWICE_FLAGS:=false}"
+: "${USE_MEOWICE_GRAALVM_FLAGS:=false}"
+
+if isTrue "${USE_MEOWICE_FLAGS}" || isTrue "${USE_MEOWICE_GRAALVM_FLAGS}"; then
+  java_major_version=$(mc-image-helper java-release)
+fi
+
+if isTrue "${USE_MEOWICE_FLAGS}"; then
+  if [[ $java_major_version -gt 16 ]]; then
+    log "Java version $java_major_version using MeowIce's flags for Java 17+"
+  else
+    log "Your Java version is $java_major_version, MeowIce's flags are for Java 17+ falling back to Aikar's"
+    USE_MEOWICE_FLAGS=FALSE
+    USE_AIKAR_FLAGS=TRUE
+  fi
+fi
+
+if isTrue "${USE_AIKAR_FLAGS}" || isTrue "${USE_MEOWICE_FLAGS}"; then
+  # From https://mcflags.emc.gs/
+  if isTrue "${USE_MEOWICE_FLAGS}"; then
+    log "Using MeowIce's flags"
+    G1NewSizePercent=28
+    G1MaxNewSizePercent=50
+    G1HeapRegionSize=16M
+    G1ReservePercent=15
+    InitiatingHeapOccupancyPercent=20
+    G1MixedGCCountTarget=3
+    G1RSetUpdatingPauseTimePercent=0
+  elif [[ $MAX_MEMORY ]] && (( $(normalizeMemSize "${MAX_MEMORY}") >= $(normalizeMemSize 12g) )); then
+    log "Using Aikar's >12GB flags"
+    G1NewSizePercent=40
+    G1MaxNewSizePercent=50
+    G1HeapRegionSize=16M
+    G1ReservePercent=15
+    InitiatingHeapOccupancyPercent=20
+    G1MixedGCCountTarget=4
+    G1RSetUpdatingPauseTimePercent=5
+  else
+    log "Using Aikar's flags"
+    G1NewSizePercent=30
+    G1MaxNewSizePercent=40
+    G1HeapRegionSize=8M
+    G1ReservePercent=20
+    InitiatingHeapOccupancyPercent=15
+    G1MixedGCCountTarget=4
+    G1RSetUpdatingPauseTimePercent=5
+  fi
+
+  JVM_XX_OPTS="${JVM_XX_OPTS}
+  -XX:+UseG1GC
+  -XX:+ParallelRefProcEnabled
+  -XX:MaxGCPauseMillis=200
+  -XX:+UnlockExperimentalVMOptions
+  -XX:+DisableExplicitGC
+  -XX:+AlwaysPreTouch
+  -XX:G1NewSizePercent=${G1NewSizePercent}
+  -XX:G1MaxNewSizePercent=${G1MaxNewSizePercent}
+  -XX:G1HeapRegionSize=${G1HeapRegionSize}
+  -XX:G1ReservePercent=${G1ReservePercent}
+  -XX:G1HeapWastePercent=5
+  -XX:G1MixedGCCountTarget=${G1MixedGCCountTarget}
+  -XX:InitiatingHeapOccupancyPercent=${InitiatingHeapOccupancyPercent}
+  -XX:G1MixedGCLiveThresholdPercent=90
+  -XX:G1RSetUpdatingPauseTimePercent=${G1RSetUpdatingPauseTimePercent}
+  -XX:SurvivorRatio=32
+  -XX:+PerfDisableSharedMem
+  -XX:MaxTenuringThreshold=1
+  "
+  if isTrue "${USE_AIKAR_FLAGS}"; then
+    JVM_XX_OPTS="${JVM_XX_OPTS}
+    -Dusing.aikars.flags=https://mcflags.emc.gs
+    -Daikars.new.flags=true
+    "
+  fi
+fi
+
+if isTrue "${USE_MEOWICE_FLAGS}"; then
+  JVM_XX_OPTS="${JVM_XX_OPTS}
+  -XX:+UnlockDiagnosticVMOptions
+  -XX:+UnlockExperimentalVMOptions
+  -XX:G1SATBBufferEnqueueingThresholdPercent=30
+  -XX:G1ConcMarkStepDurationMillis=5
+  -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:+UseTransparentHugePages
+  -XX:LargePageSizeInBytes=2M
+  -XX:+UseLargePages
+  -XX:+EagerJVMCI
+  -XX:+UseStringDeduplication
+  -XX:+UseAES
+  -XX:+UseAESIntrinsics
+  -XX:+UseFMA
+  -XX:+UseLoopPredicate
+  -XX:+RangeCheckElimination
+  -XX:+OptimizeStringConcat
+  -XX:+UseCompressedOops
+  -XX:+UseThreadPriorities
+  -XX:+OmitStackTraceInFastThrow
+  -XX:+RewriteBytecodes
+  -XX:+RewriteFrequentPairs
+  -XX:+UseFPUForSpilling
+  -XX:+UseVectorCmov
+  -XX:+UseXMMForArrayCopy
+  -XX:+EliminateLocks
+  -XX:+DoEscapeAnalysis
+  -XX:+AlignVector
+  -XX:+OptimizeFill
+  -XX:+EnableVectorSupport
+  -XX:+UseCharacterCompareIntrinsics
+  -XX:+UseCopySignIntrinsic
+  -XX:+UseVectorStubs
+  "
+  if [[ $(arch) == "x86_64" ]]; then
+    JVM_XX_OPTS="${JVM_XX_OPTS}
+    -XX:+UseFastStosb
+    -XX:+UseNewLongLShift
+    -XX:+UseXmmI2D
+    -XX:+UseXmmI2F
+    -XX:+UseXmmLoadAndClearUpper
+    -XX:+UseXmmRegToRegMoveAll
+    -XX:UseAVX=2
+    -XX:UseSSE=4
+    "
+  else
+    log "cpu not x86_64, disabling architecture specific flags"
+  fi
+  if [[ $java_major_version -gt 23 ]]; then
+    JVM_XX_OPTS="${JVM_XX_OPTS}
+    -XX:+UseCompactObjectHeaders
+    "
+  fi
+fi
+
+if isTrue "${USE_MEOWICE_GRAALVM_FLAGS}"; then
+  if [[ $java_major_version -gt 23 ]]; then
+    log "Java 24 or higher detected, using modified GraalVM flags"
+    JVM_XX_OPTS="${JVM_XX_OPTS}
+    -XX:+UseFastJNIAccessors
+    -XX:+UseInlineCaches
+    -XX:+SegmentedCodeCache
+    -Djdk.nio.maxCachedBufferSize=262144
+    -Djdk.graal.UsePriorityInlining=true
+    -Djdk.graal.Vectorization=true
+    -Djdk.graal.OptDuplication=true
+    -Djdk.graal.DetectInvertedLoopsAsCounted=true
+    -Djdk.graal.LoopInversion=true
+    -Djdk.graal.VectorizeHashes=true
+    -Djdk.graal.EnterprisePartialUnroll=true
+    -Djdk.graal.VectorizeSIMD=true
+    -Djdk.graal.StripMineNonCountedLoops=true
+    -Djdk.graal.SpeculativeGuardMovement=true
+    -Djdk.graal.TuneInlinerExploration=1
+    -Djdk.graal.LoopRotation=true
+    -Djdk.graal.CompilerConfiguration=enterprise
+    "
+  else
+    log "Using MeowIce's flags for Graalvm"
+    JVM_XX_OPTS="${JVM_XX_OPTS}
+    -XX:+UseFastJNIAccessors
+    -XX:+UseInlineCaches
+    -XX:+SegmentedCodeCache
+    -Djdk.nio.maxCachedBufferSize=262144
+    -Dgraal.UsePriorityInlining=true
+    -Dgraal.Vectorization=true
+    -Dgraal.OptDuplication=true
+    -Dgraal.DetectInvertedLoopsAsCounted=true
+    -Dgraal.LoopInversion=true
+    -Dgraal.VectorizeHashes=true
+    -Dgraal.EnterprisePartialUnroll=true
+    -Dgraal.VectorizeSIMD=true
+    -Dgraal.StripMineNonCountedLoops=true
+    -Dgraal.SpeculativeGuardMovement=true
+    -Dgraal.TuneInlinerExploration=1
+    -Dgraal.LoopRotation=true
+    -Dgraal.OptWriteMotion=true
+    -Dgraal.CompilerConfiguration=enterprise
+    "
+  fi
+fi
+
+if isTrue "${USE_FLARE_FLAGS}"; then
+  JVM_XX_OPTS="${JVM_XX_OPTS}
+  -XX:+UnlockDiagnosticVMOptions
+  -XX:+DebugNonSafepoints
+  "
+fi
+
+if isTrue "${USE_SIMD_FLAGS}"; then
+  JVM_XX_OPTS="${JVM_XX_OPTS}
+  --add-modules=jdk.incubator.vector
+  "
+fi