Friday, June 27, 2014

Parameters regarding JAVA memory tunning

This is cheat sheet regarding JAVA memory tunning.
Please refer to <How to Tune Java Garbage Collection> for details.

JVM Memory Tuning parameters

-Xms1000mHeap area size when starting JVM
-Xmx1000mMaximum heap area size
-XX:NewRatio=2Ratio of New area and Old area
-XX:NewSize=1000000New area size
-XX:SurvivorRatio=2Ratio of Eden area and Survivor area
-XX:PermSize=1000000Permanent area size
-XX:MaxPermSize=1000000Max permanent area size
-XX:+HeapDumpOnOutOfMemoryErrorCreate heap dump on OOM error
-XX:HeapDumpPath=/tmp/a.logHeap dump location.
-XX:OnOutOfMemoryError=/killparent.shActions after an OOM occurs.

Enable Verbose GC log

-verbose:gcPrint each GC.
-XX:+PrintGCDetailsPrint additional information.
-Xloggc:/tmp/gc.logLog location of GC
-XX:+PrintGCTimeStampsAdd a time stamp at the start of each collection.

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