Messages in this thread | | | Date | Thu, 4 Nov 2004 13:36:29 -0600 | From | Jack Steiner <> | Subject | Re: Externalize SLIT table |
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On Thu, Nov 04, 2004 at 06:04:35PM +0100, Andi Kleen wrote: > On Thu, Nov 04, 2004 at 04:31:42PM +0100, Erich Focht wrote: > > On Thursday 04 November 2004 15:13, Jack Steiner wrote: > > > I think it would also be useful to have a similar cpu-to-cpu distance > > > metric: > > > ????????% cat /sys/devices/system/cpu/cpu0/distance > > > ????????10 20 40 60 > > > > > > This gives the same information but is cpu-centric rather than > > > node centric. > > > > I don't see the use of that once you have some way to find the logical > > CPU to node number mapping. The "node distances" are meant to be > > I think he wants it just to have a more convenient interface, > which is not necessarily a bad thing. But then one could put the > convenience into libnuma anyways. > > -Andi
Yes, strictly convenience. Most of the cases that I have seen deal with cpu placement & cpu distances from each other. I agree that cpu-to-cpu distances can be determined by converting to nodes & finding the node-to-node distance.
A second reason is symmetry. If there is a /sys/devices/system/node/node0/distance metric, it seems as though there should also be a /sys/devices/system/cpu/cpu0/distance metric.
-- Thanks
Jack Steiner (steiner@sgi.com) 651-683-5302 Principal Engineer SGI - Silicon Graphics, Inc.
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