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JVM properties for IBM WebSphere Application Server

The Java Virtual Machine (JVM) properties for IBM WebSphere Application Server require minimal configuration changes to operate at optimum levels for Pega 7 applications. However, you can configure the JVM to analyze the performance of garbage collection by setting the following logging parameters:

  • For IBM WebSphere Application Server, Version 8 and later, set the garbage collection policy by specifying the property -Xgcpolicy:balanced.
  • For versions of IBM WebSphere Application Server that are earlier than Version 8:
    • Set the garbage collection policy to Generational concurrent (gencon) by specifying the property -Xgcpolicy:gencon.
    • Disable explicit garbage collection by specifying the -Xdisableexplicitgc property.
  • On the Configuration tab of the Process definitions window for the JVM server, set the following values:
    • Specify 4096 MB for both the Initial heap size and Maximum heap size fields.
    • Select the Verbose garbage collection check box.

You can navigate to the Process definitions window for the JVM server from the Applications server window. Under the Server Infrastructure section, expand the Java and Process Management menu and select Process definitions.


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