Increasing the Java virtual machine heap size using scripting

Some servers might 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, complete this task if the application server requires a greater heap size.

Procedure

  1. Set attributes that control the heap size for the JVM that is associated with the server.

    Use the administrative console, the wsadmin tool, or a Java client to control the heap size.

  2. 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 batch or shell command utilities. This action generates a script that you can use to launch the target server.
    • Manually set the environment variables before you start the target server with the startServer, startManager, or startNode batch or shell command utilities.
      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('-serverName server1 -nodeName node1 -maximumHeapSize heap_size')
      • Using Jacl:

        $AdminTask setJVMMaxHeapSize {-serverName server1 -nodeName node1 -maximumHeapSize heap_size}



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Last updatedLast updated: Sep 19, 2011 4:16:02 PM CDT
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