JVM Tuning Parameters

Add the JVM tuning parameters for JVM 1.4.2 shown below, by following these links in the console:

Servers>Application Servers>server1>Process Definition>Java Virtual Machine

Add “-server” as the first parameter in the “Generic JVM arguments” box. Then, add the following entries after the other existing parameters:

-XX:NewSize=336M -XX:MaxNewSize=336M
-XX:+DisableExplicitGC
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:+CMSPermGenSweepingEnabled
-XX:+UseCMSCompactAtFullCollection
-XX:CMSFullGCsBeforeCompaction=0
-XX:+CMSClassUnloadingEnabled
-XX:SoftRefLRUPolicyMSPerMB=0
-XX:+PrintClassHistogram 
-XX:+PrintGCTimeStamps 
-Xloggc:/opt/WebSphere/AppServer/logs/server1/gc.log
-XX:-CMSParallelRemarkEnabled

If you use WebSphere 6.x with Sun JVM 1.5 or later, then some of the garbage collection (GC) algorithms can be safely removed. The following is a list of JVM options that can be used with Sun JVM 1.5 or later.

-XX:NewSize=336M -XX:MaxNewSize=336M
-XX:+DisableExplicitGC
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:+PrintClassHistogram
-XX:+PrintGCTimeStamps
-Xloggc:/opt/WebSphere/AppServer/logs/server1/gc.log
-XX:-CMSParallelRemarkEnabled