Wolf-Dieter Fink [http://community.jboss.org/people/wdfink] created the discussion "Re: JBoss 5.1 - CPU high, App stops responding" To view the discussion, visit: http://community.jboss.org/message/589648#589648 -------------------------------------------------------------- It might be also possible that the GarbageCollector run into trouble (this happen to our app, also no gracefull JBoss shutdown possible). Do you activate the GC logging for JBoss? Add something like this to run.conf Java parameter: '-verbose:gc -Xloggc:${LOGDIR}/gc_`date +%Y%m%d%H%M%S`.log -XX:+PrintGCDetails -XX:+PrintTenuringDistri bution -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCTimeStamps' here you will see that 'Application time' is only a few millis and 'Time where application stopped' are seconds .... :( for additional info look to http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html if not active you might use 'jstat -gc PID 1000 1000' and check whether gc is called very often. For infos about jstat lokk here http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html hope it helps -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/589648#589648] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]