| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | <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 18:12:55 |
| Message-ID: | 8b76c51ad6db2e458431ef73bcdd2759@commandprompt.com |
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| Lists: | pgsql-performance |
On Mon, 11 Apr 2011 13:09:15 -0500, "Kevin Grittner"
<Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:
> 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.
And then make sure you aren't running CFQ.
JD
>
> -Kevin
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