Peter Johnson [http://community.jboss.org/people/peterj] created the discussion "Re: Garbage collection + JVM settings" To view the discussion, visit: http://community.jboss.org/message/567951#567951 -------------------------------------------------------------- First, you need a 64-bit OS and a 64-bit JVM (well, if you are running 32-bit Linux you might be able to get a 2GB heap). Second, you an't tell the JVM to not do any garbage collections until it reached 1.5GB of usage. Finally, are you sure that you really need a 2GB heap? To get a better understanding of how GC works, see my whitepapers titled: * Java Garbage Collection Statistical Analysis 101 * Java Garbage Collection Performance Analysis 201 at http://www.cmg.org/cgi-bin/search.cgi?q=java+peter+johnson&x=30&y=10 http://www.cmg.org/cgi-bin/search.cgi?q=java+peter+johnson&x=30&y=10 In the JBoss AS run config file, change the JAVA_OPTS line that sets the heap. Example: set "JAVA_OPTS=-Xms2048m -Xmx2024m -XX:MaxPermSize=256M" I would provide some more specific instructions but you never said: * what OS you are running on * which version of JBoss AS you are using * which version of the JVM you are running -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/567951#567951] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]