Increasing the Java virtual machine heap size using scripting


Some servers might specify a Java™ virtual machine (JVM) heap size greater than the default. We can increase the heap size of the JVM using the admin console, wsadmin, or a Java client.

 

About this task [AIX]

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

 

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

    Use the admin console, wsadmin, 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 we 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 we 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, we 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...

      • Jython...

        AdminTask.setJVMMaxHeapSize('-serverName server1 -nodeName node1 -maximumHeapSize heap_size')
      • Jacl...

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

 

Related tasks


Set servers with scripting

 

Related


Server settings configuration scripts