Hi THanks for the response. I checked those links. They are gr8. I am little bit new to this: I am using Java 1.4.2 Please have a look at my run.conf I have set Java_opts parameters only: JAVA_OPTS="-Xms128m -Xmx512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000" My server RAM is 5 GB. Free RAM varries between 40 to 15 MB. In "top" the Top Most process for eating Memory is Java it takes 235 to 245 MB. Can you suggest me How much Heap size should I keep? Do you think that Parallel GC can help than this? If yes how above line will look like? JAVA_OPTS="-Xms128m -Xmx512m -XX:+UseParallelGC -XX:ParallelGCThreads=4 (As I have 4 CPUs) Is that ok? Regards NeeleshG View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4184134#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...