Re: Linux: more cores = less concurrency.

From: Florian Weimer <fweimer(at)bfk(dot)de>
To: Jesper Krogh <jesper(at)krogh(dot)cc>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Linux: more cores = less concurrency.
Date: 2011-04-14 10:09:19
Message-ID: 8239lli1ps.fsf@mid.bfk.de
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* 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(at)bfk(dot)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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