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Re: Linux: more cores = less concurrency. - Mailing list pgsql-performance

From Kevin Grittner
Subject Re: Linux: more cores = less concurrency.
Date
Msg-id 4DA2FD7B020000250003C678@gw.wicourts.gov
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In response to Linux: more cores = less concurrency.  (Glyn Astill <glynastill@yahoo.co.uk>)
Responses Re: Linux: more cores = less concurrency.  ("Joshua D. Drake" <jd@commandprompt.com>)
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Glyn Astill <glynastill@yahoo.co.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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