JVM settings for minecraft - Revision #6

MultiMC Config - line for JvmArgs (v6)

JvmArgs=-Djava.net.preferIPv4Stack=true -server -XX:+UnlockExperimentalVMOptions -XX:CompileThreshold=752253 -XX:+TieredCompilation -XX:+UseStringCache -XX:+OptimizeStringConcat -XX:+UseBiasedLocking -Xnoclassgc -XX:+UseFastAccessorMethods -XX:+UseCompressedOops -XX:+UseG1GC -XX:NewSize=624m -XX:MaxNewSize=624m -XX:MaxGCPauseMillis=5 -XX:G1HeapRegionSize=128k -XX:G1HeapWastePercent=8 -XX:InitiatingHeapOccupancyPercent=69 -XX:SurvivorRatio=71 -XX:TargetSurvivorRatio=85 -XX:MaxTenuringThreshold=6 -XX:MaxHeapFreeRatio=11 -XX:MinHeapFreeRatio=7 -XX:ParallelGCThreads=2 -XX:ConcGCThreads=1

OLDER VERSION (v5)

{obsolete settings}

Java Arguments:
[-Djava.net.preferIPv4Stack=true, -server, -XX:+UnlockExperimentalVMOptions, -XX:CompileThreshold=752253, -XX:+TieredCompilation, -XX:+UseStringCache, -XX:+OptimizeStringConcat, -XX:-UseBiasedLocking, -Xnoclassgc, -XX:+UseFastAccessorMethods, -XX:+UseCompressedOops, -XX:+UseG1GC, -XX:NewSize=384m, -XX:MaxNewSize=384m, -XX:MaxGCPauseMillis=5, -XX:G1HeapRegionSize=128k, -XX:G1HeapWastePercent=8, -XX:InitiatingHeapOccupancyPercent=69, -XX:SurvivorRatio=71, -XX:TargetSurvivorRatio=85, -XX:MaxTenuringThreshold=6, -XX:MaxHeapFreeRatio=31, -XX:MinHeapFreeRatio=29, -XX:ParallelGCThreads=31, -XX:ConcGCThreads=17, -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump, -Xms3333m, -Xmx3333m, -XX:PermSize=317m, -Duser.language=en, -jar, C:/Clever_Minecraft_Things/MultiMC/jars/NewLaunch.jar]

OLDER VERSION (v4)

{obsolete settings}

JvmArgs=-Djava.net.preferIPv4Stack=true -XX:+UseStringCache -XX:+OptimizeStringConcat -XX:NewSize=2g -XX:MaxNewSize=2g -XX:+UseG1GC -XX:CompileThreshold=1500 -XX:-TieredCompilation -XX:TargetSurvivorRatio=95 -XX:SurvivorRatio=5 -XX:MaxTenuringThreshold=15 -XX:+UnlockExperimentalVMOptions -XX:-UseBiasedLocking -Xnoclassgc -XX:+UseFastAccessorMethods -XX:+UseCompressedOops

   

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Java Arguments:
[-Djava.net.preferIPv4Stack=true, -XX:+UseStringCache, -XX:+OptimizeStringConcat, -XX:NewSize=2g, -XX:MaxNewSize=2g, -XX:+UseG1GC, -XX:CompileThreshold=1500, -XX:-TieredCompilation, -XX:TargetSurvivorRatio=95, -XX:SurvivorRatio=5, -XX:MaxTenuringThreshold=15, -XX:+UnlockExperimentalVMOptions, -XX:-UseBiasedLocking, -Xnoclassgc, -XX:+UseFastAccessorMethods, -XX:+UseCompressedOops, -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump, -Xms4864m, -Xmx4864m, -XX:PermSize=512m, -Duser.language=en, -jar, C:/Clever_Minecraft_Things/MultiMC/jars/NewLaunch.jar]

There might be some kind hardcoded upper limit to MaxTenuringThreshold which causes any value larger than 15 to be treated as "infinity" and breaks things when this occurs...

Probably not an optimal design decision on the part of the JVM developers, but I'm not an expert on JVMs so not really going to discuss this specifically...

Learned some more info about how the ratios work, and how to better make use of the eden / survivor space...

I don't know how to explain it though, just know that I made some empirical observations and when I was researching I came across some jargon-heavy explanations about how it all works.

I wish I could say more without sounding like I'm fumbling around in the dark without a clue here, but that's pretty close to how it actually is so I'll just update this gist with v4 now O_O