V2flags

v2flags was a blazing fast set of arguments for best in class JVM performance.

This repository is unmaintained and unsupported due to the project where this was being used in being discontinued due to severe demotivation due to many key-contributors leaving. I'm sorry.

Your living on the edge, everything provided here is used at your own risk, I will not be providing support in any way.

Server, ZGC:

Use these flags on a server running either bare metal, or in a container.

Don't forget to adjust -Xms and -Xmx to your server configuration, along with java path and server.jar if applicable

java -Xms8G -Xmx8G -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+UseZGC -XX:-ZUncommit -XX:-ZProactive -Dterminal.jline=false -Dterminal.ansi=true -Djline.terminal=jline.UnsupportedTerminal -Dlog4j2.formatMsgNoLookups=true -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+UseNUMA -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:+EagerJVMCI -Dgraal.TuneInlinerExploration=1 -XX:+ParallelRefProcEnabled -XX:InitiatingHeapOccupancyPercent=15 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:-UseBiasedLocking -XX:+UseStringDeduplication -XX:+UseAES -XX:+UseAESIntrinsics -XX:+UseFMA -XX:+UseLoopPredicate -XX:+RangeCheckElimination -XX:+EliminateLocks -XX:+DoEscapeAnalysis -XX:+UseCodeCacheFlushing -XX:+SegmentedCodeCache -XX:+UseFastJNIAccessors -XX:+OptimizeStringConcat -XX:+UseCompressedOops -XX:+UseThreadPriorities -XX:+OmitStackTraceInFastThrow -XX:+TrustFinalNonStaticFields -XX:ThreadPriorityPolicy=1 -XX:+UseInlineCaches -XX:+RewriteBytecodes -XX:+RewriteFrequentPairs -XX:-DontCompileHugeMethods -XX:+UseFPUForSpilling -XX:AllocatePrefetchStyle=3 -XX:+UseFastStosb -XX:+UseNewLongLShift -XX:+UseVectorCmov -XX:+UseXMMForArrayCopy -XX:+UseXmmI2D -XX:+UseXmmI2F -XX:+UseXmmLoadAndClearUpper -XX:+UseXmmRegToRegMoveAll -XX:+UseLargePages -XX:LargePageSizeInBytes=2M -DPaper.IgnoreJavaVersion=true -Dfile.encoding=UTF-8 -Xlog:async -Djava.security.egd=file:/dev/urandom --add-modules jdk.incubator.vector -jar server.jar –-nogui

Pterodactyl, ZGC:

Use these flags on Pterodactyl Panel, You will need administrator rights on your panel in order to import this egg.

Get the GraalVM Template egg and add your server.jar manually

Adjust CUTDOWN in startup settings to how much memory you want to reserve to the system to prevent OOMKilling, usually 1-4G should be enough depending on the load.

If you wish to not reserve memory to the OS for some reason, adjust swap accordingly, preferably to -1

java -Xms$(({{SERVER_MEMORY}} - ({{CUTDOWN}})))M -Xmx$(({{SERVER_MEMORY}} - ({{CUTDOWN}})))M -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+UseZGC -XX:-ZUncommit -XX:-ZProactive -Dterminal.jline=false -Dterminal.ansi=true -Djline.terminal=jline.UnsupportedTerminal -Dlog4j2.formatMsgNoLookups=true -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+UseNUMA -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:+EagerJVMCI -XX:+ParallelRefProcEnabled -XX:InitiatingHeapOccupancyPercent=15 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:+UseStringDeduplication -XX:+UseAES -XX:+UseAESIntrinsics -XX:+UseFMA -XX:+UseLoopPredicate -XX:+RangeCheckElimination -XX:+EliminateLocks -XX:+DoEscapeAnalysis -XX:+UseCodeCacheFlushing -XX:+SegmentedCodeCache -XX:+UseFastJNIAccessors -XX:+OptimizeStringConcat -XX:+UseCompressedOops -XX:+UseThreadPriorities -XX:+OmitStackTraceInFastThrow -XX:+TrustFinalNonStaticFields -XX:ThreadPriorityPolicy=1 -XX:+UseInlineCaches -XX:+RewriteBytecodes -XX:+RewriteFrequentPairs -XX:-DontCompileHugeMethods -XX:+UseFPUForSpilling -XX:AllocatePrefetchStyle=3 -XX:+UseFastStosb -XX:+UseNewLongLShift -XX:+UseXmmI2D -XX:+UseXmmI2F -XX:+UseXmmLoadAndClearUpper -XX:+UseXmmRegToRegMoveAll -XX:+UseVectorCmov -XX:+UseXMMForArrayCopy -XX:+UseLargePages -XX:LargePageSizeInBytes=2M -DPaper.IgnoreJavaVersion=true -Dfile.encoding=UTF-8 -Xlog:async -Djava.security.egd=file:/dev/urandom --add-modules jdk.incubator.vector -jar {{SERVER_JARFILE}} --nogui

High End Client, ZGC:

Stupidly CPU intensive, G1GC performs better on older/weaker CPUs. <br> These are not as rigorously tested as the server flags, but no additional issues should arise under normal circumstances.

You may also need to include -Xms6G and -Xmx6G (or whatever memory you want allocated) if you are running this on the vanilla launcher, This is primarily made for MultiMC based launchers (such as Prism) which disallow those values being present.

-XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+UseZGC -XX:-ZUncommit -XX:-ZProactive -Dterminal.jline=false -Dterminal.ansi=true -Djline.terminal=jline.UnsupportedTerminal -Dlog4j2.formatMsgNoLookups=true -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+Use -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:+EagerJVMCI -XX:+ParallelRefProcEnabled -XX:InitiatingHeapOccupancyPercent=15 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:+UseStringDeduplication -XX:+UseAES -XX:+UseAESIntrinsics -XX:+UseFMA -XX:+UseLoopPredicate -XX:+RangeCheckElimination -XX:+EliminateLocks -XX:+DoEscapeAnalysis -XX:+UseCodeCacheFlushing -XX:+SegmentedCodeCache -XX:+UseFastJNIAccessors -XX:+OptimizeStringConcat -XX:+UseCompressedOops -XX:+UseThreadPriorities -XX:+OmitStackTraceInFastThrow -XX:+TrustFinalNonStaticFields -XX:ThreadPriorityPolicy=1 -XX:+UseInlineCaches -XX:+RewriteBytecodes -XX:+RewriteFrequentPairs -XX:-DontCompileHugeMethods -XX:+UseFPUForSpilling -XX:AllocatePrefetchStyle=3 -XX:+UseFastStosb -XX:+UseNewLongLShift -XX:+UseXmmI2D -XX:+UseXmmI2F -XX:+UseXmmLoadAndClearUpper -XX:+UseXmmRegToRegMoveAll -XX:+UseVectorCmov -XX:+UseXMMForArrayCopy -XX:+UseLargePages -XX:LargePageSizeInBytes=2M -Dfile.encoding=UTF-8 -Xlog:async -Djava.security.egd=file:/dev/urandom --add-modules jdk.incubator.vector

Low End Client, G1GC:

You may also need to include -Xms2G and -Xmx2G (or whatever memory you want allocated) if you are running this on the vanilla launcher, (use Prism) This is primarily made for MultiMC based launchers (such as Prism) which disallow those values being present.

-XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -Dterminal.jline=false -Dterminal.ansi=true -Djline.terminal=jline.UnsupportedTerminal -Dlog4j2.formatMsgNoLookups=true -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+Use -XX:AllocatePrefetchStyle=3 -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:+EagerJVMCI -Dgraal.CompilerConfiguration=community -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:InitiatingHeapOccupancyPercent=15 -XX:SurvivorRatio=32 -XX:MaxTenuringThreshold=1 -XX:+UseStringDeduplication -XX:+UseAES -XX:+UseAESIntrinsics -XX:+UseFMA -XX:+UseLoopPredicate -XX:+RangeCheckElimination -XX:+EliminateLocks -XX:+DoEscapeAnalysis -XX:+UseCodeCacheFlushing -XX:+SegmentedCodeCache -XX:+UseFastJNIAccessors -XX:+OptimizeStringConcat -XX:+UseCompressedOops -XX:+UseThreadPriorities -XX:+OmitStackTraceInFastThrow -XX:+TrustFinalNonStaticFields -XX:ThreadPriorityPolicy=1 -XX:+UseInlineCaches -XX:+RewriteBytecodes -XX:+RewriteFrequentPairs -XX:-DontCompileHugeMethods -XX:+UseFPUForSpilling -XX:+UseFastStosb -XX:+UseNewLongLShift -XX:+UseXmmI2D -XX:+UseXmmI2F -XX:+UseXmmLoadAndClearUpper -XX:+UseXmmRegToRegMoveAll -XX:+UseVectorCmov -XX:+UseXMMForArrayCopy -XX:+UseLargePages -XX:LargePageSizeInBytes=2M -Dfile.encoding=UTF-8 -Xlog:async -Djava.security.egd=file:/dev/urandom --add-modules jdk.incubator.vector

Warning Option UseBiasedLocking was deprecated in version 15.0 and will likely be removed in a future release. can be ignored.

Do not use more than 16GB, it is detrimental in most circumstances unless your in a heavily modded environment

Explanation

***Please try not to rely on these explanations, these were made when I had little social experience. In addition, some explanations were removed due to being made by a contributor I do not wish to be associated with anymore. ***

[!NOTE] For most of the flags below -XX:+UnlockExperimentalVMOptions and/or -XX:+UnlockDiagnosticVMOptions are required.

<br>

-Xmx8G

Specifies the maximum amount of memory the JVM may use in gigabytes

<br>

-Xms8G

Specifies the initial heap size for the JVM in gigabytes

<br>

[!NOTE] Setting both -Xms and Xmx to the same size is recommended to improve predictability, and to have less GC cycles.

<br>

-XX:+UseZGC

Tells the JVM to use the ZGC garbage collector

<br>

-XX:-ZUncommit

Stops ZGC from returning memory back to the OS. This can help improve speed as it doesn't have to wait for the OS to reallocate the memory but may also result on undesi