You may actually be swapping.  That can be even worse than GC!

On Fri, May 21, 2010 at 11:32 AM, Stephen Green <>wrote:

> Right.  The system can be very memory-intensive, but at the time these
> are occurring, it's not under a really heavy load, and there's plenty
> of heap available. However, while looking at a thread dump from one of
> the nodes, I realized that a very poor decision meant that I had more
> than 1200 threads running.  I expect this is more of a problem than
> the GC at this point.  I'm taking steps to correct this problem now.

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