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From Florian Weimer ...@deneb.enyo.de>
Subject Re: A model for predicting indexing memory costs?
Date Sat, 14 Mar 2009 13:51:38 GMT
* mark harwood:

> Thanks, I have a heap dump now from a run with reduced JVM memory
> (in order to speed up a failure point) and am working through it
> offline with VisualVm.

> This test induced a proper OOM as opposed to one of those "timed out
> waiting for GC " type OOMs so may be misleading.

It wouldn't be unusual if the same root cause sometimes results in a
straight OOM, sometimes in the time-out variant.

> I have another run soldiering on with the -XX:-UseGCOverheadLimit
> setting to avoid GC -related timeouts and this has not hit OOM but
> is slowing to a crawl.

You could try to enable hprof and get a heap dump when you terminate
the VM with SIGINT/^C.

In the end, you probably have to do this with a realisticly-sized run
to get good data.

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