Increasing the Java virtual machine heap size using scripting

For some servers, it may be required to specify a Java virtual machine (JVM) heap size greater than the default. You can increase the heap size of the JVM using the administrative console, the wsadmin tool, or a Java client.

About this task [AIX]

If you are using a JVM platform that is running on a 32-bit AIX system, perform this task if the application server, deployment manager, or node agent require a greater heap size.

Procedure

  1. Set attributes that control the heap size for the JVM associated with the server. This can be done using the administrative console, the wsadmin tool, or a Java client.
  2. Perform one of the following to increase the heap size of the JVM:
    • Create a script to launch the server. Use the -script option with the command that you are using to start the target server, for example, the startServer, startManager, or startNode commands. This will generate a script for that you can use to launch the target server in the future.
    • Manually set the environment variables before starting the target server with the startServer, startManager, or startNode commands.
      [AIX HP-UX Linux Solaris Windows] [iSeries] With the following settings, you can specify a maximum heap size for the JVM of 11 multiplied by 256 megabytes:
      export IBM_JVM_LDR_CNTRL_NEW_VALUE=MAXDATA=0XB0000000@DSA
      export LDR_CNTRL=MAXDATA=0XB0000000@DSA
      
    • Use the AdminTask object. For example:
      • Using Jython:

        AdminTask.setJVMMaxHeapSize ('[-interactive]')
      • Using Jacl:

        $AdminTask setJVMMaxHeapSize {-interactive}
    [AIX] For additional information on AIX address space management, view the following sources:



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Last updated: Feb 19, 2011 5:25:36 AM CST
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