linux-kernel - Re: NUMA processor numbering

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Message-ID: <20131003102255.GA2086@khazad-dum.debian.net>
Date:	Thu, 3 Oct 2013 07:22:55 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Stephan von Krawczynski <skraw@...net.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: NUMA processor numbering

On Thu, 03 Oct 2013, Stephan von Krawczynski wrote:
> Does the above output mean that the cores are numbered right across the two
> physical cpus? Does this mean one has to pin processes to 0,2,4,... to stay in
> "short distance" to node 0 RAM?

...

> If so, it would be a lot better to have them numbered 0-15 and 16-31 for pinning.
> Is there a way to achieve this?

Yes, use hwloc to get the pinning masks for whatever property you want (e.g.
all threads in a given core, all threads in a given node, all threads that
share a given L3 cache...).

http://www.open-mpi.org/projects/hwloc/

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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