From: | "Peter Haworth" <pmh(at)edison(dot)ioppublishing(dot)com> |
---|---|
To: | Wes <wespvp(at)syntegra(dot)com>, <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Ridiculous load |
Date: | 2004-12-14 12:12:04 |
Message-ID: | PGM.20041214121204.25459.5162@edison.ioppublishing.com |
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Lists: | pgsql-general |
On Sat, 11 Dec 2004 10:44:59 -0600, Wes wrote:
> On 12/9/04 9:23 AM, "Peter Haworth" <pmh(at)edison(dot)ioppublishing(dot)com> wrote:
>
> > It runs RHEL ES v3, kernel 2.4.21-20.ELsmp
> > It's generally a very stable box which runs a number of postgresql
> > instances. But last night we hit very high low averages - 10+, vs the
> > normal 0-2.
> > The culprit appeared to be kswapd, which was using huge amounts of cpu.
> > I'd like to know why!
>
> There were some major changes in swap management somewhere in the linux 2.4
> kernel (also RH 3.0 ES). I don't off hand remember exactly which level.
> Under a heavy I/O load, we also saw kswapd going nuts with the 2.4.21
> kernel, destroying system performance. The only solution we found was to
> upgrade to a 2.6 kernel.
We've now upgraded to RedHat's 2.4.21-25.ELsmp, which seems to have fixed
things.
--
Peter Haworth pmh(at)edison(dot)ioppublishing(dot)com
"Back then, I remember wondering how come he accepted my offer instead
of doing something sensible like, say, running away screaming."
-- Yanick Champoux, on being a Perl Golf referee
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