From: Kevin Grittner <Kevin.Grittner@wicourts.gov>
To: pgsql-performance@postgresql.org
To: Glyn Astill <glynastill@yahoo.co.uk>
Subject: Re: Linux: more cores = less concurrency.
Date: Mon, 11 Apr 2011 13:09:15 -0500
Message-ID: <4DA2FD7B020000250003C678@gw.wicourts.gov> (raw)
In-Reply-To: <860299.67368.qm@web26003.mail.ukl.yahoo.com>
References: <860299.67368.qm@web26003.mail.ukl.yahoo.com>
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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To: pgsql-performance@postgresql.org
Cc: Kevin.Grittner@wicourts.gov, glynastill@yahoo.co.uk
Subject: Re: Linux: more cores = less concurrency.
In-Reply-To: <4DA2FD7B020000250003C678@gw.wicourts.gov>
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