My personal GraalVM set of flags dedicated for Minecraft Server (and make it performs better), based on Aikars's flags and with the addition of GraalVM Enterprise optimization flags,
If you want to apply this flag on Ptedrodactyl or any Docker-based panel then I'd reccommend using my docker image (forked from RikoDev): https://github.com/AlexAn75541/pterodactyl-graalvm
java -Xms8G -Xmx8G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=130 -XX:ConcGCThreads=2 -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+DisableExplicitGC -XX:G1NewSizePercent=40 -XX:G1MaxNewSizePercent=50 -XX:G1HeapRegionSize=16M -XX:G1ReservePercent=15 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=3 -XX:InitiatingHeapOccupancyPercent=20 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs/ -XX:UseAVX=3 -XX:+UseStringDeduplication -XX:+UseFastUnorderedTimeStamps -XX:+UseAES -XX:+UseFMA -XX:+UseAESIntrinsics -XX:UseSSE=4 -XX:AllocatePrefetchStyle=1 -XX:+UseLoopPredicate -XX:+RangeCheckElimination -XX:+EliminateLocks -XX:+DoEscapeAnalysis -XX:+UseCodeCacheFlushing -XX:+UseFastJNIAccessors -XX:+OptimizeStringConcat -XX:+UseCompressedOops -XX:+UseThreadPriorities -XX:+OmitStackTraceInFastThrow -XX:+TrustFinalNonStaticFields -XX:ThreadPriorityPolicy=1 -XX:+UseInlineCaches -XX:+RewriteBytecodes -XX:+RewriteFrequentPairs -XX:+UseNUMA -XX:-DontCompileHugeMethods -XX:+UseCMoveUnconditionally -XX:+UseFPUForSpilling -XX:+UseNewLongLShift -XX:+UseVectorCmov -XX:+UseXMMForArrayCopy -XX:+UseXmmI2D -XX:+UseXmmI2F -XX:+UseXmmLoadAndClearUpper -XX:+UseXmmRegToRegMoveAll -Dgraal.TuneInlinerExploration=1 -Dgraal.CompilerConfiguration=enterprise -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.InfeasiblePathCorrelation=true -DPlazma.disableConfigOptimization -Dfile.encoding=UTF-8 -Xlog:async -Djava.security.egd=file:/dev/urandom --add-modules=jdk.incubator.vector -Dpaper.disable-plugin-rewriting=true -jar server.jar
You can change the -Xmx and -Xms to fit your server's RAM, keep in mind that both of these value should be the same as mentioned in here
Caution
These flags are my personal choice, your server's performance may vary. I haven't test these flags thoroughly enough to prove that this method will work as expected
Note
Pterodactyl Panel users must set the -Xmx and -Xms value to 70-80% of the server's RAM in order to cover the Java's Overhead memory.
Additionally, you can "automate" the value by setting this:
-Xms$(({{SERVER_MEMORY}} - ({{SERVER_MEMORY}}/8)))M -Xmx$(({{SERVER_MEMORY}} - ({{SERVER_MEMORY}}/8)))M
As you can see, the number 8 I've set above indicates how much RAM after divided to 10 (equivalent of dividing the RAM to 80%) and subsequently, the server's allocated RAM would minus that divided value and SHOULD be able to run well.
- https://github.com/Obydux/Minecraft-GraalVM-Flags
- https://github.com/brucethemoose/Minecraft-Performance-Flags-Benchmarks
- https://www.reddit.com/r/feedthebeast/comments/18hta1r/how_i_about_doubled_my_minecraft_performance/
- https://obydux.github.io/Minecraft-startup-flags/s
- https://github.com/etil2jz/etil-minecraft-flags
- https://docs.papermc.io/paper/1.18/aikars-flags
- https://aikar.co/2018/07/02/tuning-the-jvm-g1gc-garbage-collector-flags-for-minecraft/
These optimizations method will be listed in this repo with some tweaks in the future:
- https://github.com/MeowIce/meowice-flags
- https://minecraftvn.net/cau-hinh-de-giam-lag-va-toi-uu-server-minecraft-de-dat-hieu-nang-tot-nhat.t46151/ (Vietnamese-only)
- https://github.com/hilltty/hilltty-flags/blob/main/english-lang.md (Shenandoah GC or smth, big changes ig)