From: William Yu <wyu@talisys.com>
To: pgsql-performance@postgresql.org
Subject: Re: Performance problems on 4/8way Opteron (dualcore)
Date: Sun, 31 Jul 2005 14:11:58 -0700
Message-ID: <dcjer1$16ov$1@news.hub.org> (raw)
In-Reply-To: <BF123C5B.868%jrogers@neopolitan.com>
References: <dcfbtl$2msc$1@news.hub.org>
<BF123C5B.868%jrogers@neopolitan.com>
A 4xDC would be far more sensitive to poor NUMA code than 2xDC so I'm
not surprised I don't see performance issues on our 2xDC w/ < 2.6.12.
J. Andrew Rogers wrote:
> On 7/30/05 12:57 AM, "William Yu" <wyu@talisys.com> wrote:
>
>>I haven't investigated the 2.6.12+ kernel updates yet -- I probably will
>>do our development servers first to give it a test.
>
>
>
> The kernel updates make the NUMA code dual-core aware, which apparently
> makes a big difference in some cases but not in others. It makes some
> sense, since multi-processor multi-core machines will have two different
> types of non-locality instead of just one that need to be managed. Prior to
> the v2.6.12 patches, a dual-core dual-proc machine was viewed as a quad-proc
> machine.
>
> The closest thing to a supported v2.6.12 kernel that I know of is FC4, which
> is not really supported in the enterprise sense of course.
>
>
> J. Andrew Rogers
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster
>
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To: pgsql-performance@postgresql.org
Cc: wyu@talisys.com
Subject: Re: Performance problems on 4/8way Opteron (dualcore)
In-Reply-To: <dcjer1$16ov$1@news.hub.org>
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