Removed deprecated options, support for JDK 24.
Flags cuc dep trai by meowice uwu
This commit is contained in:
MeowIce authored and 
GitHub committed
1 parent
73d9da5361
commit
aa49e742b0
1 file changed
+64
-29
@@ -1,18 +1,45 @@
|
||||
# Welcome !
|
||||
Glad you are here ! In this repository, I'll give you the Java flags I use to run my Minecraft server (with 80-90 players) at its best.
|
||||
Hewwo there, I'm glad you are here ! This instruction will guide you to use MeowIce's Flags to make your Minecraft server run as it best ^^
|
||||
## Compatibility
|
||||
These flags are only compatible with:
|
||||
- Java 17+,
|
||||
My flags are only compatible and tested with:
|
||||
- Java 24+,
|
||||
- GraalVM JVM,
|
||||
- Linux.
|
||||
# The flags
|
||||
- Linux,
|
||||
- Minecraft 1.20+
|
||||
> [!TIP]
|
||||
> Using MeowIce's Flags with [Leaf](https://github.com/Winds-Studio/Leaf) as server software can boost more performance !
|
||||
# TL;DR: The flags
|
||||
## G1GC version (for server below 32GB allocated heap)
|
||||
> [!NOTE]
|
||||
> This is recommended for servers allocated below 32GB RAM with basic resource usage. Balanced between memory usage and performance.
|
||||
|
||||
`--add-modules=jdk.incubator.vector -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:+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:+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.CompilerConfiguration=enterprise
|
||||
`--add-modules=jdk.incubator.vector -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:+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:+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 -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
|
||||
`
|
||||
## ZGC version (for server with 32GB+ allocated heap)
|
||||
> [!NOTE]
|
||||
> This is recommended for servers with more than 32GB of allocated memory and many CPU cores, allowing for minimizing the delay between each GC run with a larger heap size in an intensive environment.
|
||||
|
||||
> [!WARNING]
|
||||
> Only use this if you have more than 10 CPU cores; using ZGC on systems with fewer than 8 cores may cause a significant performance impact !
|
||||
|
||||
`--add-modules=jdk.incubator.vector -XX:+UseZGC -XX:-ZProactive -XX:SoftMaxHeapSize=$((Memory - 2048))M -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:+PerfDisableSharedMem -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=1 -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:+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 -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`
|
||||
|
||||
# What is MeowIce's Flags ?
|
||||
MeowIce's Flags aimed to blend Aikar's Flags optimization with new JVM features to further boost the overall performance, while allowing it to use advanced CPU instructions to accelerate some workloads.
|
||||
> [!NOTE]
|
||||
> Hey don't forget to leave a star !
|
||||
> <img width="756" height="157" alt="image" src="https://github.com/user-attachments/assets/4db8d2e9-e2fa-448e-9a52-7af7a6c7369a" />
|
||||
|
||||
# Why would I have to... switch ?
|
||||
Almost 99% of Minecraft servers use Aikar's Flags and it is recommended by many people (some use nothing !). But why use other flags ?
|
||||
The answer is that we have now developed to Minecraft 1.21.x and Java 22 (at the time of writing this) and Aikar's Flags **was written mainly to optimize Minecraft's Garbage Collector** and Java at that time (around 2018 - 2020). Later Java versions (from Java 17 and above) have added many optimization items for JVM. So I wrote a separate flag to support optimizations and integrates new features of Java 17+ while still keeping Aikar's flags to optimize GC. <ins>There's no risk in trying my flags !</ins>
|
||||
# Explainations
|
||||
Almost 99% of Minecraft servers use Aikar's Flags, and it is recommended by many people (some use nothing !). But why use other flags ?
|
||||
The answer is: We have now developed to Minecraft 1.21.x and Java 24 (at the time of writing this), and Aikar's Flags **was written mainly to optimize Minecraft's Garbage Collector** and Java version at that time (Java 8 and Java 11, around 2018 - 2020). Later Java versions (from Java 17 and above) have added many optimization options for the JVM. So I wrote a separate flag to support these optimizations and integrate new features of Java 17+ while still keeping Aikar's flags mainly to optimize GC. <ins>There's no risk in trying my flags !</ins>
|
||||
# Why GraalVM but not AdoptiumJDK or OpenJDK ?
|
||||
GraalVM with better JIT performance and more aggressive optimizations compared to traditional `HotSpot C2` found in many JDKs (including OpenJDK and AdoptiumJDK (aka. Eclipse Temurin)). This change makes inlining, loop unrolling, escape analysis, and vectorization work better while maintaining lower CPU usage.
|
||||
Furthermore, the GraalVM compiler compiles plugins and server code faster and smarter, adapting to actual usage and environment on the fly.
|
||||
> [!TIP]
|
||||
> GraalVM allows you to inspect memory usage and trace down naughty plugins using VisualVM !
|
||||
|
||||
# Flags explanation
|
||||
- `--add-modules=jdk.incubator.vector` Enables advanced vector computation capabilities for Pufferfish/Purpur 1.18+. Useful for optimizing chunk loading and rendering.
|
||||
- ` -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` These are very generic G1GC flags, based on [Aikar's Flags](https://aikar.co/2018/07/02/tuning-the-jvm-g1gc-garbage-collector-flags-for-minecraft/).
|
||||
- `-XX:+UseNUMA` Enables NUMA or (Non Uniform Memory Access) for supported architecture.
|
||||
@@ -60,35 +87,43 @@ The answer is that we have now developed to Minecraft 1.21.x and Java 22 (at the
|
||||
- `-XX:+UseInlineCaches` Use Inline Caches for virtual calls
|
||||
- `-XX:+SegmentedCodeCache` Enables the segmented code cache, which improves code cache management.
|
||||
## GraalVM Compiler Specific Flags
|
||||
- `-Djdk.nio.maxCachedBufferSize=262144` Sets the maximum size for cached direct buffers.
|
||||
- `-Dgraal.UsePriorityInlining=true` Enables priority inlining in the Graal compiler.
|
||||
- `-Dgraal.Vectorization=true` Enables vectorization in the Graal compiler.
|
||||
- `-Dgraal.OptDuplication=true` Enables optimization duplication in the Graal compiler.
|
||||
- `-Dgraal.DetectInvertedLoopsAsCounted=true` Enables detection of inverted loops as counted loops.
|
||||
- `-Dgraal.LoopInversion=true` Enables loop inversion in the Graal compiler.
|
||||
- `-Dgraal.VectorizeHashes=true` Enables vectorization of hash computations.
|
||||
- `-Dgraal.VectorizeSIMD=true` Enables SIMD (Single Instruction - Multiple Data) vectorization.
|
||||
- `-Dgraal.StripMineNonCountedLoops=true` Enables strip mining of non-counted loops.
|
||||
- `-Dgraal.SpeculativeGuardMovement=true` Enables speculative guard movement in the Graal compiler.
|
||||
- `-Dgraal.TuneInlinerExploration=1` Tunes the inliner exploration parameter in the Graal compiler.
|
||||
- `-Dgraal.LoopRotation=true -Dgraal.UseCountedLoopSafepoints=true -Dgraal.EnterprisePartialUnroll=true` Loops related.
|
||||
# Small test
|
||||
- `-Djdk.nio.maxCachedBufferSize=262144` Sets the maximum size for cached direct buffers.
|
||||
- `-Djdk.graal.UsePriorityInlining=true` Enables priority inlining in the Graal compiler.
|
||||
- `-Djdk.graal.Vectorization=true` Enables vectorization in the Graal compiler.
|
||||
- `-Djdk.graal.OptDuplication=true` Enables optimization duplication in the Graal compiler.
|
||||
- `-Djdk.graal.DetectInvertedLoopsAsCounted=true` Enables detection of inverted loops as counted loops.
|
||||
- `-Djdk.graal.LoopInversion=true` Enables loop inversion in the Graal compiler.
|
||||
- `-Djdk.graal.VectorizeHashes=true` Enables vectorization of hash computations.
|
||||
- `-Djdk.graal.VectorizeSIMD=true` Enables SIMD (Single Instruction - Multiple Data) vectorization.
|
||||
- `-Djdk.graal.StripMineNonCountedLoops=true` Enables strip mining of non-counted loops.
|
||||
- `-Djdk.graal.SpeculativeGuardMovement=true` Enables speculative guard movement in the Graal compiler.
|
||||
- `-Djdk.graal.TuneInlinerExploration=1` Tunes the inliner exploration parameter in the Graal compiler.
|
||||
- `-Djdk.graal.LoopRotation=true` Enables loop rotation in the Graal compiler.
|
||||
- `-Djdk.graal.UseCountedLoopSafepoints=true` Enables safepoint insertion in counted loops.
|
||||
- `-Djdk.graal.EnterprisePartialUnroll=true` Enables partial unrolling optimizations in enterprise mode.
|
||||
- `-Djdk.graal.CompilerConfiguration=enterprise` Enables Enterprise mode optimizations in the Graal compiler.
|
||||
|
||||
# Comparison
|
||||
I have made a comparison with one of my customers' servers.
|
||||
## Spark
|
||||
Aikar's Flags and Adoptium JDK:
|
||||
|
||||
|
||||
<img width="1909" height="398" alt="image" src="https://github.com/user-attachments/assets/eae32edc-f162-4b33-9246-2443933621ac" />
|
||||
|
||||
|
||||
|
||||
MeowIce's Flags and GraalVM:
|
||||
|
||||
|
||||
|
||||
|
||||
<img width="1920" height="423" alt="image" src="https://github.com/user-attachments/assets/dcd97360-d73e-49f3-a4b2-1869bb581686" />
|
||||
|
||||
## TPS
|
||||
With only Aikar's flags and OpenJDK:
|
||||
<img width="1405" height="202" alt="image" src="https://github.com/user-attachments/assets/42e6dab1-76ed-4c1b-b320-d4d0a3407cf1" />
|
||||
With MeowIce's flags and GraalVM:
|
||||
<img width="1296" height="255" alt="image" src="https://github.com/user-attachments/assets/c8280ebd-f51e-43fb-a16a-62340c8829ca" />
|
||||
|
||||
### Sources
|
||||
- [Java Flags Benchmarked](https://github.com/brucethemoose/Minecraft-Performance-Flags-Benchmarks)
|
||||
- [Obydux GraalVM Flags](https://github.com/Obydux/Minecraft-GraalVM-Flags/)
|
||||
- [Optimize MC Server on RedHat](https://www.redhat.com/en/blog/optimizing-rhel-8-run-java-implementation-minecraft-server)
|
||||
### Read more
|
||||
- [Hướng dẫn: Cấu hình để giảm lag và tối ưu server Minecraft để đạt hiệu năng tốt nhất](https://minecraftvn.net/cau-hinh-de-giam-lag-va-toi-uu-server-minecraft-de-dat-hieu-nang-tot-nhat.t46151/)
|
||||
### My Optimization service:
|
||||
- [Dịch vụ tối ưu, fix lag máy chủ Minecraft](https://minecraftvn.net/toi-uu-fix-lag-cuc-cang-may-chu-minecraft.t47454/)
|
||||
Reference in new issue
Block a user