Increase the Java virtual machine heap size using scripting

 

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About this task

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

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 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. 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

    For additional information on AIX address space management, view the following sources:

Related information
Configuring servers with scripting

 


 

 

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AIX is a trademark of the IBM Corporation in the United States, other countries, or both.