[Topaz-dev] [Topaz-pubapp-dev] Mulgara Performance Woes

[Life is hard, and then you die]

On Tue, Mar 04, 2008 at 10:47:41AM -0800, Russell Uman wrote:
> 
> is it possible that mulgara is having the same problems with ehcache
> that we're seeing the pub-apps after it's been up for awhile, and the
> high CPU load we're seeing on mulgara is the same as the high CPU load
> we see on the pub-apps when ehcache is thrashing?

No, because nothing's cached (in ehcache) on mulgara. Ehcache on
mulgara has been configured to only send out cache-invalidations - no
updates are received from anybody else, and nothing is ever stored.

> i also notice that no -Xmx parameter is set for mulgara in
> /etc/sysconfig/mulgara - i think the theory was that mulgara wouldn't
> need a lot of memory and we'd want to leave as much RAM open for
> OS-level file caching as possible - does everyone still feel the same
> way?

The RAM is needed for mmap'ing the db files. Mulgara is not using much
memory at all and is nowhere near the current max. Run visualgc (in
~topazdev/jvmstat/bin/visualgc) to see a pretty picture of things.

So no, don't change that parameter (I suppose you could lower it a
bit).


  Cheers,

  Ronald