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Oracle SOA Suite Performance Tuning Cookbook by Matt Brasier, Nicholas Wright

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Identifying permanent generation problems with jstat

The permanent generation is a special part of the HotSpot JVM's memory, which stores "class templates"' for the JVM class loader to use when creating and removing objects.

jstat is a JVM command-line tool, which shows you a number of statistics regarding how the JVM is performing.

In this recipe, we use jstat to understand the size of the permanent generation.

Getting ready

You will need SOA Suite installed for this recipe, and will need permission to execute the domain control scripts, as well as the HotSpot JVM tools. This recipe assumes that your SOA Suite application is running such that we may run jstat against it.

The tools jps and jstat are included with both the HotSpot and JRockit JVMs. ...

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