Hi guys, I am trying to figure out how much memory a process is really using (in this case tomcat). I tried ps and top, they give me different numbers. Here is what top says: PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND 23691 root 25 0 37584 36M 11300 S 0.0 1.8 0:06 0 java Here is what "ps vgax" says: PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 23691 ? S 0:06 3383 55 456676 37580 1.8 /usr/java/jdk/bin/java ...bla... Tomcat it self says the following (getting it from the Java-VM): JVM Free memory: 5.09 MB Total memory: 11.62 MB Max memory: 254.06 MB So what is true now? What do all the different ps and top numbers mean? Some websites say ps does not display the proper numbers, but is there something better? It does not have to be totally accurate, I am just trying to get an approximate feel for the memory consumption of tomcat over time under different scenarios. But the 36MB of top vs. the 12MB tomcat reports is a little too inaccurate. I didnt think that the java VM had that much overhead?! What I am trying to do is collect the data using snmp and run some diagrams, so I need something that can be called from a script, no graphical X application... Thanks, MARK
