Excessive memory usage in OpenFire VM when Crowd is started

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Each time Crowd is started, although ps aux shows that Crowd only takes Xmx + XX:MaxPermSize of physical memory, the VM's memory usage will spike to a level near the limit of the VM's physical memory.


By default, Atlassian applications such as Crowd will not use more physical memory (RES) than the specified Xmx + XX:MaxPermSize in JAVA_OPTS. This is however, not true with applications hosted in OpenFire. OpenFire does not seem to respect the limits specified in JAVA_OPTS, it only does so with INSTALL4J_ADD_VM_PARAMS.


  • Shutdown Crowd

  • Navigate to CrowdInstallation/apache-tomcat/bin and edit setenv.sh
  • Add the following line:

    INSTALL4J_ADD_VM_PARAMS="-Xms256m -Xmx512m -XX:MaxPermSize=256m $JAVA_OPTS -Djava.awt.headless=true "

    Set the Xmx, Xms and MaxPermsize based on your requirements

  • Startup Crowd
Last modified on Feb 26, 2016

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