From: Florian Weimer <fweimer@bfk.de>
To: Jesper Krogh <jesper@krogh.cc>
Cc: pgsql-performance@postgresql.org
Subject: Re: Linux: more cores = less concurrency.
Date: Thu, 14 Apr 2011 10:09:19 +0000
Message-ID: <8239lli1ps.fsf@mid.bfk.de> (raw)
In-Reply-To: <4DA35CF8.7050205@krogh.cc>
References: <356731.11980.qm@web26005.mail.ukl.yahoo.com>
<4DA35CF8.7050205@krogh.cc>
* Jesper Krogh:
> If you have a 1 socket system, all of your data can be fetched from
> "local" ram seen from you cpu, on a 2 socket, 50% of your accesses
> will be "way slower", 4 socket even worse.
There are non-NUMA multi-socket systems, so this doesn't apply in all
cases. (The E5320-based system is likely non-NUMA.)
Speaking about NUMA, do you know if there are some non-invasive tools
which can be used to monitor page migration and off-node memory
accesses?
--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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To: pgsql-performance@postgresql.org
Cc: fweimer@bfk.de, jesper@krogh.cc
Subject: Re: Linux: more cores = less concurrency.
In-Reply-To: <8239lli1ps.fsf@mid.bfk.de>
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