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.

Ralph Castain <rhc@open-mpi.org> 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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