Andi Beckar [http://community.jboss.org/people/abeckar] created the discussion "Generall Memory Question" To view the discussion, visit: http://community.jboss.org/message/597091#597091 -------------------------------------------------------------- Hi there, could anyone please explain the following to me. Settings of my JVM: (jboss4.4.2 - java 1.5.0_10) "-Xms128m -Xmx1536m -XX:MaxPermSize=512m -verbose:gc -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000" # should be 2048MB And this is what i see when the Machine is running a few hours: --- snip cmd top ---   PID USER      PR  NI  VIRT    RES   SHR    S    %CPU %MEM    TIME+     COMMAND                 7401 jboss      25    0   2802m  1.9g   291m  S    39        11.8         33:14.50  java     --- snip cmd top END --- why are the "RES" and the "VIRT" Mem even higher than my Setting tells the JVM to be ? and how many jboss instances, with the above described JVM Settings, can i run on a single machine with 8GB RAM with the goal not to come in any SWAP Situations. Thanks Andi ;) -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/597091#597091] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]