From: James Cloos <cloos@jhcloos.com>
To: Glyn Astill <glynastill@yahoo.co.uk>
Cc: Steve Clark <sclark@netwolves.com>
Cc: david@lang.hm, 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
Subject: Re: Linux: more cores = less concurrency.
Date: Mon, 11 Apr 2011 16:39:46 -0400
Message-ID: <m3k4f034k5.fsf@jhcloos.com> (raw)
In-Reply-To: <976931.36062.qm@web26004.mail.ukl.yahoo.com>
References: <976931.36062.qm@web26004.mail.ukl.yahoo.com>
>>>>> "GA" == Glyn Astill <glynastill@yahoo.co.uk> writes:
GA> I was hoping someone had seen this sort of behaviour before,
GA> and could offer some sort of explanation or advice.
Jesper's reply is probably most on point as to the reason.
I know that recent Opterons use some of their cache to better manage
cache-coherency. I presum recent Xeons do so, too, but perhaps yours
are not recent enough for that?
-JimC
--
James Cloos <cloos@jhcloos.com> OpenPGP: 1024D/ED7DAEA6
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To: pgsql-performance@postgresql.org
Cc: cloos@jhcloos.com, glynastill@yahoo.co.uk, sclark@netwolves.com, scott.marlowe@gmail.com, jd@commandprompt.com, Kevin.Grittner@wicourts.gov
Subject: Re: Linux: more cores = less concurrency.
In-Reply-To: <m3k4f034k5.fsf@jhcloos.com>
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