From: Joshua D. Drake <jd@commandprompt.com>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org
Cc: Glyn Astill <glynastill@yahoo.co.uk>
Subject: Re: Linux: more cores = less concurrency.
Date: Mon, 11 Apr 2011 11:12:55 -0700
Message-ID: <8b76c51ad6db2e458431ef73bcdd2759@commandprompt.com> (raw)
In-Reply-To: <4DA2FD7B020000250003C678@gw.wicourts.gov>
References: <860299.67368.qm@web26003.mail.ukl.yahoo.com>
<4DA2FD7B020000250003C678@gw.wicourts.gov>
On Mon, 11 Apr 2011 13:09:15 -0500, "Kevin Grittner"
<Kevin.Grittner@wicourts.gov> wrote:
> 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.
And then make sure you aren't running CFQ.
JD
>
> -Kevin
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, Kevin.Grittner@wicourts.gov, glynastill@yahoo.co.uk
Subject: Re: Linux: more cores = less concurrency.
In-Reply-To: <8b76c51ad6db2e458431ef73bcdd2759@commandprompt.com>
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