Hi, I am trying to get the GC output using following switches in JVM JAVA_OPTS="-server -Xms1500m -Xmx1500m -Xss128k -verbosegc -Xloggc:GC.log -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+UseLargePages -XX:PermSize=512m -XX:MaxPermSize=512m -XX:ThreadStackSize=512 -XX:+UseParallelGC -XX:+AggressiveHeap -XX:CompileThreshold=100 -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=31" But GC.log doesn't seems to be generating. My environment is JDK 1.5 update 12 OS: RHEL Linux Jboss 4.2.0 Thanks View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4233442#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...