Use the sparkc gcmonitor command in the Spark mod to observe pauses. Garbage collection flags must be added to Minecraft servers and clients, as the default "pauses" to stop and collect garbage manifest as stutters on the client and lag on servers. #Atlauncher java 8 windowsKeep a close eye on the Windows Task manager (or your DE's system monitor) as Minecraft is running, and allocate only as much as it needs (which is usually less than 8G). Allocating too little can also slow the game down. Sizes are set in megabytes ( -Xms4096M) or gigabytes ( -Xmx8G)Īllocating too much memory can force your operating system to page, make garbage collection pauses more severe, and/or slow the game down. Minimum and maximum ( -xms and -xmx) memory should be set to the same value, as explained here: xms8G -XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+UseNUMA -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:-DontCompileHugeMethods -XX:MaxNodeLimit=240000 -XX:NodeLimitFudgeFactor=8000 -XX:+UseVectorCmov -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:ThreadPriorityPolicy=1 -XX:AllocatePrefetchStyle=3 -XX:+UseG1GC -XX:MaxGCPauseMillis=37 -XX:+PerfDisableSharedMem -XX:G1HeapRegionSize=16M -XX:G1NewSizePercent=23 -XX:G1ReservePercent=20 -XX:SurvivorRatio=32 -XX:G1MixedGCCountTarget=3 -XX:G1HeapWastePercent=20 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1RSetUpdatingPauseTimePercent=0 -XX:MaxTenuringThreshold=1 -XX:G1SATBBufferEnqueueingThresholdPercent=30 -XX:G1ConcMarkStepDurationMillis=5.0 -XX:G1ConcRSHotCardLimit=16 -XX:G1ConcRefinementServiceIntervalMillis=150 -XX:GCTimeRatio=99 -XX:+UseLargePages -XX:LargePageSizeInBytes=2m You must add garbage collection flags to these java arguments. XX:+UnlockExperimentalVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:+UseNUMA -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:-DontCompileHugeMethods -XX:MaxNodeLimit=240000 -XX:NodeLimitFudgeFactor=8000 -XX:+UseVectorCmov -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:ThreadPriorityPolicy=1 -XX:AllocatePrefetchStyle=3 These optimized flags will work with any Java 11+ build. If you dont know what to pick on Windows or OSX, I recommend Graal EE (see below) or the latest Adoptium JRE: Base Java Flags much slower in Minecraft, and uses totally different flags than any other Java build. Red Hat Java 8 has the Shenandoah garbage collector. #Atlauncher java 8 modsGrab it from Clear Linux's repos, or from here: Īzul's Prime OpenJDK is very fast since it hooks into llvm, but its currently incompatible with most mods and is linux-only. #Atlauncher java 8 codeIntel's Clear Linux OpenJDK uses the same code as any other OpenJDK (making it highly compatible with mods), but the build process itself is optimized for newer CPUs. This is what I personally run Minecraft with, see the GraalVM section below. Oracle GraalVM Enterprise Edition features a more aggressive Java compiler. Most Java runtimes from Azul, Microsoft, Adoptium, Amazon and so on are basically identical. Some launchers like PolyMC or Curseforge ask you to use Java 8 on 1.16.X specifically, but Minecraft and most mods are compatible with Java 17.ġ.12.2 and below generally requires Java 8. Picking a Java Runtumeįor Minecraft 1.16.5 and up, use Java 17. Discord for questions and such: Benchmarksįlags are tested with Benchmark.py script.
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