CustomVM

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title: CustomVM permalink: IntelliJNotes/CustomVM category: IntelliJNotes parent: IntelliJNotes layout: default has_children: false share: true shortRepo:

• intellijnotes
• default

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Table of contents

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Run the command java -X and you will get a list of all -X options:

C:\Users\Admin>java -X

-Xmixed           mixed mode execution (default)
-Xint             interpreted mode execution only
-Xbootclasspath:<directories and zip/jar files separated by ;>
set search path for bootstrap classes and resources
-Xbootclasspath/a:<directories and zip/jar files separated by ;>
append to end of bootstrap class path
-Xbootclasspath/p:<directories and zip/jar files separated by ;>
prepend in front of bootstrap class path
-Xdiag            show additional diagnostic messages
-Xnoclassgc       disable class garbage collection
-Xincgc           enable incremental garbage collection
-Xloggc:<file>    log GC status to a file with time stamps
-Xbatch           disable background compilation
-Xms<size>        set initial Java heap size.........................
-Xmx<size>        set maximum Java heap size.........................
-Xss<size>        set java thread stack size
-Xprof            output cpu profiling data
-Xfuture          enable strictest checks, anticipating future default
-Xrs              reduce use of OS signals by Java/VM (see documentation)
-Xcheck:jni       perform additional checks for JNI functions
-Xshare:off       do not attempt to use shared class data
-Xshare:auto      use shared class data if possible (default)
-Xshare:on        require using shared class data, otherwise fail.
-XshowSettings    show all settings and continue
-XshowSettings:all         show all settings and continue
-XshowSettings:vm          show all vm related settings and continue
-XshowSettings:properties  show all property settings and continue
-XshowSettings:locale      show all locale related settings and continue

ORIGINAL

-Xms128m
-Xmx750m
-XX:ReservedCodeCacheSize=240m
-XX:+UseConcMarkSweepGC
-XX:SoftRefLRUPolicyMSPerMB=50
-ea
-XX:CICompilerCount=2
-Dsun.io.useCanonPrefixCache=false
-Djava.net.preferIPv4Stack=true
-Djdk.http.auth.tunneling.disabledSchemes=""
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
-Djdk.attach.allowAttachSelf=true
-Dkotlinx.coroutines.debug=off
-Djdk.module.illegalAccess.silent=true

UPDATED- https://medium.com/stochastic-stories/tuning-my-intellij-ide-8255781f6a0d

-Xms15g
-XX:ReservedCodeCacheSize=2g
-XX:+UseCompressedOops
-XX:+UseG1GC
-XX:MaxGCPauseMillis=100
-XX:+PerfDisableSharedMem
-XX:SoftRefLRUPolicyMSPerMB=50
-ea
-XX:CICompilerCount=2
-Dsun.io.useCanonPrefixCache=false
-Djava.net.preferIPv4Stack=true
-Djdk.http.auth.tunneling.disabledSchemes=""
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
-Djdk.attach.allowAttachSelf=true
-Dkotlinx.coroutines.debug=off
-Djdk.module.illegalAccess.silent=true

other custom settings http://tomaszdziurko.com/2015/11/1-and-the-only-one-to-customize-intellij-idea-memory-settings/

boost performance putting caches in memory https://medium.com/@sergio.igwt/boosting-performance-of-intellij-idea-and-the-rest-of-jetbrains-ides-cd34952bb978

mklink /D "R:\Temp\intellij\caches" "C:\Users\bpaxton.IntelliJIdea2019.3\system\caches" mklink /D "R:\Temp\intellij\index" "C:\Users\bpaxton.IntelliJIdea2019.3\system\index"

current

-server
-Xms8g
-Xmx8g
-XX:ReservedCodeCacheSize=2g
-XX:NewRatio=3
-XX:CICompilerCount=6
-Xss16m
-XX:+UseConcMarkSweepGC
-XX:+CMSParallelRemarkEnabled
-XX:ConcGCThreads=4
-XX:+AlwaysPreTouch
-XX:+TieredCompilation
-XX:+UseCompressedOops
-XX:SoftRefLRUPolicyMSPerMB=50
-Djava.net.preferIPv4Stack=true
-ea
-Djava.net.preferIPv4Stack=true
-Djdk.http.auth.tunneling.disabledSchemes=""
-XX:+HeapDumpOnOutOfMemoryError
-XX:-OmitStackTraceInFastThrow
-Djdk.attach.allowAttachSelf=true
-Dkotlinx.coroutines.debug=off
-Djdk.module.illegalAccess.silent=true
-Dide.no.platform.update=true
-Dsun.io.useCanonCaches=false
-XX:ReservedCodeCacheSize=512m
-Didea.plugins.path=C:\\Users\\bpaxton\\AppData\\Local\\JetBrains\\Toolbox\\apps\\IDEA-U\\ch-0\\203.6682.168.plugins

https://github.com/serpro69/config/blob/master/idea64.vmoptions#L36

working

  # custom IntelliJ IDEA VM options (expand/override 'bin/idea.vmoptions')
  -ea
  -server
  -Xms6g
  -Xmx6g
  -Xss16m
  -XX:MaxMetaspaceSize=2G
  -XX:MetaspaceSize=512m
  -XX:ConcGCThreads=6
  -XX:ParallelGCThreads=6
  -XX:NewRatio=3
  -XX:ReservedCodeCacheSize=2g
  -XX:+AlwaysPreTouch
  -XX:+UseConcMarkSweepGC
  -XX:+TieredCompilation
  -Djava.net.preferIPv4Stack=true

  -XX:+UseCodeCacheFlushing
  -XX:+DisableExplicitGC
  -XX:+ExplicitGCInvokesConcurrent
  -XX:+AggressiveOpts
  -XX:+CMSClassUnloadingEnabled
  -XX:CMSInitiatingOccupancyFraction=60
  -XX:+CMSParallelRemarkEnabled
  -XX:+UseAdaptiveGCBoundary

  -XX:+OptimizeStringConcat
  -XX:+UseStringCache
  -XX:+UseFastAccessorMethods

  -XX:+UseCompressedOops
  -XX:-OmitStackTraceInFastThrow

Custom JVM ARGS

Custom JVM args set jvm args in build.gradle bootRun{} jvmArgs = ["-server", "-XX:ReservedCodeCacheSize=2g", "-XX:NewRatio=3", "-XX:ActiveProcessorCount=12", "-Xss16m", "-XX:+UseConcMarkSweepGC", "-XX:+CMSParallelRemarkEnabled", "-XX:ConcGCThreads=4", "-XX:+AlwaysPreTouch", "-XX:+TieredCompilation", "-XX:+UseCompressedOops", "-Xdebug", "-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005", "-Xmx8g"]

set remote connection