IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Using Heapdump > Getting Heapdumps

Enabling text formatted ("classic") Heapdumps

The generated Heapdump is by default in the binary, platform-independent, PHD format, which can be examined using the available tooling.

For more information, see Available tools for processing Heapdumps. However, an immediately readable view of the heap is sometimes useful. You can obtain this view by using the opts= suboption with -Xdump:heap (see Using dump agents). For example:

• -Xdump:heap:opts=CLASSIC will start the default Heapdump agents using classic rather than PHD output.
• -Xdump:heap:defaults:opts=CLASSIC+PHD will enable both classic and PHD output by default for all Heapdump agents.

You can also define one of the following environment variables:

• IBM_JAVA_HEAPDUMP_TEST, which allows you to perform the equivalent of opts=PHD+CLASSIC
• IBM_JAVA_HEAPDUMP_TEXT, which allows the equivalent of opts=CLASSIC

Parent: Getting Heapdumps

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