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Re: Performance problems on 4/8way Opteron (dualcore) HP DL585

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Cc: Dirk Lutzebäck <lutzeb(at)aeccom(dot)com>,Sven Geisler <sgeisler(at)aeccom(dot)com>
Subject: Re: Performance problems on 4/8way Opteron (dualcore) HP DL585
Date: 2005-07-29 17:46:10
Message-ID: 200507291046.10318.josh@agliodbs.com (view raw or flat)
Thread:
Lists: pgsql-performance
Dirk,

> does anybody have expierence with this machine (4x 875 dual core Opteron
> CPUs)?

Nope.   I suspect that you may be the first person to report in on 
dual-cores.  There may be special compile issues with dual-cores that 
we've not yet encountered.

> We run RHEL 3.0, 32bit and under high load it is a drag. We 
> mostly run memory demanding queries. Context switches are pretty much
> around 20.000 on the average, no cs spikes when we run many processes in
> parallel. Actually we only see two processes in running state! When
> there are only a few processes running context switches go much higher.
> At the moment we are much slower that with a 4way XEON box (DL580).

Um, that was a bit incoherent.  Are you seeing a CS storm or aren't you?

-- 
--Josh

Josh Berkus
Aglio Database Solutions
San Francisco

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