Hi Jeff,
Thanks for taking care of this.
Here is what I got on a worker node:
> mpirun --mca mpi_paffinity_alone 1 /opt/software/SGI/hwloc/
1.1rc6r3028/bin/hwloc-bind --get
0x00000001
Is this what is expected, please ? Or should I try yet another
command ?
Thanks, Regards, Gilbert.
Le 7 janv. 11 à 15:35, Jeff Squyres a écrit :
On Jan 6, 2011, at 11:23 PM, Gilbert Grosdidier wrote:
lstopo
Machine (35GB)
NUMANode L#0 (P#0 18GB) + Socket L#0 + L3 L#0 (8192KB)
L2 L#0 (256KB) + L1 L#0 (32KB) + Core L#0
PU L#0 (P#0)
PU L#1 (P#8)
L2 L#1 (256KB) + L1 L#1 (32KB) + Core L#1
PU L#2 (P#1)
PU L#3 (P#9)
L2 L#2 (256KB) + L1 L#2 (32KB) + Core L#2
PU L#4 (P#2)
PU L#5 (P#10)
L2 L#3 (256KB) + L1 L#3 (32KB) + Core L#3
PU L#6 (P#3)
PU L#7 (P#11)
[snip]
Well, this might disprove my theory. :-\ The OS indexing is not
contiguous on the hyperthreads, so I might be wrong about what
happened here. Try this:
mpirun --mca mpi_paffinity_alone 1 hwloc-bind --get
You can even run that on just one node; let's see what you get.
This will tell us what each process is *actually* bound to. hwloc-
bind --get will report a bitmask of the P#'s from above. So if we
see 001, 010, 011, ...etc, then my theory of OMPI binding 1 proc per
hyperthread (vs. 1 proc per core) is incorrect.
--
Jeff Squyres
jsquy...@cisco.com
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Gilbert Grosdidier gilbert.grosdid...@in2p3.fr
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Faculté des Sciences, Bat. 200 Fax : +33 1 6446 8546
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