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From Bryan Talbot <btal...@aeriagames.com>
Subject Re: constant CMS GC using CPU time
Date Thu, 25 Oct 2012 00:22:55 GMT
On Wed, Oct 24, 2012 at 2:38 PM, Rob Coli <rcoli@palominodb.com> wrote:

> On Mon, Oct 22, 2012 at 8:38 AM, Bryan Talbot <btalbot@aeriagames.com>
> wrote:
> > The nodes with the most data used the most memory.  All nodes are
> affected
> > eventually not just one.  The GC was on-going even when the nodes were
> not
> > compacting or running a heavy application load -- even when the main app
> was
> > paused constant the GC continued.
>
> This sounds very much like "my heap is so consumed by (mostly) bloom
> filters that I am in steady state GC thrash."
>

Yes, I think that was at least part of the issue.



>
> Do you have heap graphs which show a healthy sawtooth GC cycle which
> then more or less flatlines?
>
>

I didn't save any graphs but that is what they would look like.  I was
using jstat to monitor gc activity.

-Bryan

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