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Re: Pg+Linux swap use

From: Neil Conway <neilc(at)samurai(dot)com>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: Bill Moran <wmoran(at)potentialtech(dot)com>,PostgreSQL Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Pg+Linux swap use
Date: 2003-10-31 18:45:48
Message-ID: 1067625948.447.4.camel@tokyo (view raw or flat)
Thread:
Lists: pgsql-performance
On Fri, 2003-10-31 at 11:37, Greg Stark wrote:
> My understanding is that the case where HT hurts is precisely your case. When
> you have two real processors with HT the kernel will sometimes schedule two
> jobs on the two virtual processors on the same real processor leaving the two
> virtual processors on the other real processor idle.

If you're seeing this behavior, it's sounds like a bug/deficiency in
your kernel's scheduler: if it is HT-aware, it should go to some lengths
to avoid this kind of processor allocation.

-Neil



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