I think I plotted graphs properly this time. 1. When set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m Graph is http://img169.imageshack.us/img169/6715/withoutyoung.jpg 2. When set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m -XX:NewSize=300M -XX:MaxNewSize=300M -XX:SurvivorRatio=32 -XX:+UseTLAB -XX:TLABSize=64K Graph is http://img203.imageshack.us/img203/9528/withyoung.jpg The server machine is having 4 processors. 32 bit JVM. What is meant by CMS collection? You mean using Concurrent Collector (Using -XX:+UseConcMarkSweepGC -XX:+UseParNewGC options)? Btw, I configured the HttpConnector with maxthreads=600. (I arrived at this number after monitoring the busy threads using JMX Console) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258700#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...