From: Andi Kleen <andi@firstfloor.org>
To: Andreas Mueller <andreas.mueller@asg.com>
Cc: "'linux-numa@vger.kernel.org'" <linux-numa@vger.kernel.org>
Subject: Re: How does numa_parse_nodestring +0-1 works/should work
Date: Thu, 16 May 2013 14:11:26 +0200 [thread overview]
Message-ID: <20130516121126.GI17814@two.firstfloor.org> (raw)
In-Reply-To: <D6259D1CCF526540B1CB447E5F3BC39B1FD4923BB1@gechem8mail.asg.com>
On Thu, May 16, 2013 at 02:00:40PM +0200, Andreas Mueller wrote:
> could someone please explain the behaviour of a nodestring "+0-1" or similar for numa_parse_nodestring?
>
> According to the manual, "a leading + can be used to indicate that the node numbers in the list are relative to the task's cpuset".
>
> What I expected and want to achieve is, that if a process was started on node 3, I will get a node mask of 3,4.
cpuset refers to the cpusets in
http://man7.org/linux/man-pages/man7/cpuset.7.html
You seem to think it refers to the plain task affinity, which is not the
case.
In general generic relative NUMA policy descriptions would be nice
(like in OpenMP4) but we only have them with cpusets currently.
-andi
next prev parent reply other threads:[~2013-05-16 12:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 12:00 How does numa_parse_nodestring +0-1 works/should work Andreas Mueller
2013-05-16 12:11 ` Andi Kleen [this message]
2013-05-22 9:22 ` NUMA performance, optimal settings for multithreaded, memory mapped file access Andreas Mueller
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