Hi, I am in the process of setting up Jboss Server in a clustered mode using Jboss 4.2.3 and portal 2.6.7. Just been playing around with the memory settings and wanted to see if any of you have any opinion on the memory settings i currently have. I have 2 64 bit servers running Java 1.5.0.19 and with a RAM of 24G on Centos OS This is what i have currently done. 1. Setup OS to use large/huge TLB. I think the sys admin has set this up to 18G. 2. i have been playing around with the heap/memory settings and this is what i currently have: #Memory Settings JAVA_OPTS=" -d64 -Dsun.rmi.dgc.client.gcInterval=1800000 -Dsun.rmi.dgc.server.gcInterval=1800000 -Xms15g -Xmx15g -XX:PermSize=1g -XX:MaxPermSize=1g -XX:ReservedCodeCacheSize=256m -XX:NewSize=6g -XX:MaxNewSize=6g -XX:+UseLargePages" #Garbage Collector settings JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:MaxGCPauseMillis=500 -XX:+CMSIncrementalMode" #extra settings JAVA_OPTS="$JAVA_OPTS -server -Xss128k -Djboss.serverPeerID=$ServerPeerID -Djboss.partition.name=$partitionName -Dportal.hibernate.cache.partition.name=$hibernateCache -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Xloggc:/var/log/jboss/jvmgcc/gcc.txt " Does any of you have any suggestion on the above settings ? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4235602#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...