Generating and analyzing heap dump

Use this task to generate and analyze heap dump on the i5/OS operating system.

If you generate heap dumps, a severe performance impact on WebSphere Application Server may result for several minutes, even though heap dumps are only generated in response to a detected memory leak.

About this task

To help you analyze memory leak problems when memory leak detection occurs, use the Heap Analysis Tools for Java function. Use the Heap Analysis Tools component (also known as Heap Analyzer) to perform Java application heap analysis and object create profiling (size and identification) over time. Heap Analyzer includes information about the following topics:

• Java virtual machine (JVM) heap growth or size

• The objects being created, including type of object, count and object size, and object heap size

• The Heap Footprint application for memory sizing and performance considerations

• A call stack for every snapshot you run in profile mode so objects created can be correlated to functions in the application

The Heap Analyzer tool is a component of the iDoctor for iSeries suite of performance monitoring tools.

What to do next

Use the heap monitor feature to monitor the JVM heap size of a WebSphere Application Server profile in comparison to pool size.

Related concepts

Searchable topic ID: tprf_enablingheapdump_is