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