Help -> Edit Custom VM Options

intellij.vmoptions

# custom IntelliJ IDEA VM options
# https://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html

-ea
-Xms4096m
-Xmx8192m

-XX:CMSInitiatingOccupancyFraction=65
-XX:MaxMetaspaceSize=512m
-XX:MaxTenuringThreshold=1
-XX:NewRatio=2
-XX:ParallelGCThreads=4
-XX:ReservedCodeCacheSize=512m
-XX:SoftRefLRUPolicyMSPerMB=50
-XX:SurvivorRatio=8

-XX:+AggressiveOpts
-XX:+CMSClassUnloadingEnabled
-XX:+CMSParallelRemarkEnabled
-XX:+CMSScavengeBeforeRemark
-XX:+HeapDumpOnOutOfMemoryError
-XX:+UseCMSInitiatingOccupancyOnly
-XX:+UseCompressedOops
-XX:+UseConcMarkSweepGC
-XX:+UseCodeCacheFlushing
-XX:+UseConcMarkSweepGC
-XX:+UseParNewGC

-XX:-OmitStackTraceInFastThrow
-XX:-TraceClassUnloading

-Xverify:none

-Dfile.encoding=UTF-8
-Djava.net.preferIPv4Stack=true
-Djdk.http.auth.tunneling.disabledSchemes=""
-Dsun.io.useCanonCaches=false

-XX:ErrorFile=$USER_HOME/java_error_in_idea_%p.log
-XX:HeapDumpPath=$USER_HOME/java_error_in_idea.hprof