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

Parameter	Description
-Xms1000m	Heap area size when starting JVM
-Xmx1000m	Maximum heap area size
-XX:NewRatio=2	Ratio of New area and Old area
-XX:NewSize=1000000	New area size
-XX:SurvivorRatio=2	Ratio of Eden area and Survivor area
-XX:PermSize=1000000	Permanent area size
-XX:MaxPermSize=1000000	Max permanent area size
-XX:+HeapDumpOnOutOfMemoryError	Create heap dump on OOM error
-XX:HeapDumpPath=/tmp/a.log	Heap dump location.
-XX:OnOutOfMemoryError=/killparent.sh	Actions after an OOM occurs.

Enable Verbose GC log

Parameter	Description
-verbose:gc	Print each GC.
-XX:+PrintGCDetails	Print additional information.
-Xloggc:/tmp/gc.log	Log location of GC
-XX:+PrintGCTimeStamps	Add a time stamp at the start of each collection.