From: Steve Clark <sclark@netwolves.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org, Glyn Astill <glynastill@yahoo.co.uk>
Subject: Re: Linux: more cores = less concurrency.
Date: Mon, 11 Apr 2011 15:51:47 -0400
Message-ID: <4DA35BD3.5040206@netwolves.com> (raw)
In-Reply-To: <BANLkTi=Wi+DsO5Bu1kYi1GL6rECAf8M1DA@mail.gmail.com>
References: <860299.67368.qm@web26003.mail.ukl.yahoo.com>
<4DA2FD7B020000250003C678@gw.wicourts.gov>
<8b76c51ad6db2e458431ef73bcdd2759@commandprompt.com>
<BANLkTi=Wi+DsO5Bu1kYi1GL6rECAf8M1DA@mail.gmail.com>
On 04/11/2011 02:32 PM, Scott Marlowe wrote:
> On Mon, Apr 11, 2011 at 12:12 PM, Joshua D. Drake<jd@commandprompt.com> wrote:
>> 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.
Anyone know the reason for that?
>> And then make sure you aren't running CFQ.
>>
>> JD
> This++
>
> Also if you're running a good hardware RAID controller, jsut go to NOOP
>
--
Stephen Clark
*NetWolves*
Sr. Software Engineer III
Phone: 813-579-3200
Fax: 813-882-0209
Email: steve.clark@netwolves.com
http://www.netwolves.com
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To: pgsql-performance@postgresql.org
Cc: sclark@netwolves.com, scott.marlowe@gmail.com, jd@commandprompt.com, Kevin.Grittner@wicourts.gov, glynastill@yahoo.co.uk
Subject: Re: Linux: more cores = less concurrency.
In-Reply-To: <4DA35BD3.5040206@netwolves.com>
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