Re: Linux: more cores = less concurrency.

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От Florian Weimer
Тема Re: Linux: more cores = less concurrency.
Дата
Msg-id 8239lli1ps.fsf@mid.bfk.de
обсуждение исходный текст
Ответ на Re: Linux: more cores = less concurrency.  (Jesper Krogh <jesper@krogh.cc>)
Ответы Re: Linux: more cores = less concurrency.  (Cédric Villemain <cedric.villemain.debian@gmail.com>)
Список pgsql-performance
* 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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