JVM parameter values

Select the objects and properties associated with the Java™ Virtual Machine (JVM) that you want to change.

To change these properties, you must specify the broker name, and set the ObjectName to ComIbmJVMManager. If you are setting a debug port number, you must also include -e and specify the name of the execution group which will use the port. If you are changing the heap size, omit -e; the size is effective for all execution groups created in the broker.

-n jvmMinHeapSize
The minimum size of the storage available to the JVM.
  • Value type - integer
-n jvmMaxHeapSize
The maximum size of the storage available to the JVM. If you have configured a publish/subscribe domain, when execution groups retain publications, you might need to increase this value. If you have included the XMLTransformation node in one or more message flows, and the node is processing very large XML messages, you might also need to change this parameter.
  • Value type - integer
-n jvmDebugPort
The port on which the execution group is listening. You must set a port number to activate debug in the execution group.
  • Value type - integer
  • Initial value - 0

See the mqsichangeproperties command for examples of how to change parameters for the JVM. Other examples are provided for particular tasks:

Related concepts
Publish/subscribe performance tuning
JVM heap sizing
Related tasks
Debugging a message flow
Related reference
mqsichangeproperties command
mqsireportproperties command
XMLTransformation node
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Copyright IBM Corporation 1999, 2009Copyright IBM Corporation 1999, 2009. All Rights Reserved.
Last updated : 2009-01-07 15:40:46

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