Re: Linux: more cores = less concurrency.

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: <pgsql-performance(at)postgresql(dot)org>, "Glyn Astill" <glynastill(at)yahoo(dot)co(dot)uk>
Subject: Re: Linux: more cores = less concurrency.
Date: 2011-04-11 18:09:15
Message-ID: 4DA2FD7B020000250003C678@gw.wicourts.gov
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Glyn Astill <glynastill(at)yahoo(dot)co(dot)uk> wrote:

> The new server uses 4 x 8 core Xeon X7550 CPUs at 2Ghz

Which has hyperthreading.

> our current servers are 2 x 4 core Xeon E5320 CPUs at 2Ghz.

Which doesn't have hyperthreading.

PostgreSQL often performs worse with hyperthreading than without.
Have you turned HT off on your new machine? If not, I would start
there.

-Kevin

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