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From Peter Schuller <>
Subject Re: Ran into an issue where Cassandra Crashed when running out of heap space
Date Tue, 20 Jul 2010 20:28:15 GMT
> Attaching Jconsole shows that there is a growth of memory and weird
> spikes. Unfortunately I did not take a screen shot of the growth of
> the spike over time. I'll do that when it occurs again.

Note that expected behavior for CMS is to have lots of small ups and
downs as a result of young generation GC:s, and a longer period cycle
of larger ups and downs that correspond to CMS kicking in with a
concurrent mark/sweep phase.

To get a reasonable estimate of the actual live set, you would
normally look at the free memory at the end of one of the larger dips
after a CMS mark/sweep phase.

/ Peter Schuller

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