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Subject: Re: [OMPI devel] btl/openib: get_ib_dev_distance doesn't see processes as bound if the job has been launched by srun
From: Ralph Castain (rhc_at_[hidden])
Date: 2012-02-09 08:34:11


Ah, okay - in that case, having the I/O device attached to the "closest" object at each depth would be ideal from an OMPI perspective.

On Feb 9, 2012, at 6:30 AM, Brice Goglin wrote:

> The bios usually tells you which numa location is close to each host-to-pci bridge. So the answer is yes.
> Brice
>
>
> Ralph Castain <rhc_at_[hidden]> a écrit :
> I'm not sure I understand this comment. A PCI device is attached to the node, not to any specific location within the node, isn't it? Can you really say that a PCI device is "attached" to a specific NUMA location, for example?
>
>
> On Feb 9, 2012, at 6:15 AM, Jeff Squyres wrote:
>
>> That doesn't seem too attractive from an OMPI perspective, though. We'd want to know where the PCI devices are actually rooted.
>
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