Karthikeyan Duraisamy [https://community.jboss.org/people/karthykn] created the discussion "Server Hangs, Optimization issues" To view the discussion, visit: https://community.jboss.org/message/817573#817573 -------------------------------------------------------------- Hi, I am quiet new here. forgive if my questions are dump. We are having a problem on JBoss(Version: 5.0.0.CR2) server running with Jrockit(Version :build R27.6.5-32_o-121899-1.6.0_14-20091001-2107-windows-ia32) The server hang frequently. was trying to optimize the JVM settings. Initial JVM setting was : *set JAVA_OPTS=%JAVA_OPTS% -Xms768m -Xmx1024m -XX:MaxPermSize=256m* Later have chaged to *set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m -Xns512m -XXkeepAreaRatio=3 -XXsetGC:genparcon -XXcompactSetLimit:10200 -Xverbose:gc -Xverboselog:jbossVerboseLog.txt* But getting some page fault errors as shown below, +[INFO ][memory ] Warning: Your computer has generated 31142 page faults during the last garbage collection.+ +[INFO ][memory ] If you find this swapping problematic, please consider running JRockit with a smaller heap.+ After few hours it started  Throwing OutOfMemory: allocLargeObjectOrArray So I included the XXtlaSize in jvm settings, *set JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx1024m -Xns512m -XXlargeObjectLimit=70k -XXtlaSize=70k -XXminBlockSize=96k -XXkeepAreaRatio=3 -XXsetGC:genparcon -XXcompactSetLimit:10200  -Xverbose:gc -Xverboselog:jbossVerboseLog.txt* But server become very unstable, server restarted automatically. Now we revert all the changes to initial settings. I have attached verbose log. Please suggest me in case if i need to look into something else. Thanks in advance. Karthik +* *+ -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/817573#817573] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]