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Editorial Team
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Asked: 2026-06-06T12:03:39+00:00

i wonder if the environment variable IBM_HEAPDUMP enabled by default in IBM J9? I

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i wonder if the environment variable IBM_HEAPDUMP enabled by default in IBM J9? I searched through the internet and somebody say it is while other say not. Let me suppose if it’s active by default, that means, the signal-based heapdump has been enabled. And JVM would catch all the pre-defined signal and generate heapdump accordingly.
However, if so like above, why do we still need to configure with -Xdump:what? just as link described http://www-304.ibm.com/support/docview.wss?uid=swg21246238.
The another question is whether IBM_HEAPDUMP and -Xdump:what are functioning overlap here? Or i’m totally understanding wrongly with these two.

Thanks in advance

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  1. Editorial Team

    You’re misunderstanding 🙂

    -Xdump:what doesn’t configure anything. It simply shows what dumps are enabled on the JVM in question. Thus you can look at the output from -Xdump:what to see what’s enabled. By default, yes, there’s dumps enabled like IBM_HEAPDUMP but you may want more control/detail.

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