Unfortunately, I was unable to spot any striking difference in perfs when using --bind-to-core.

 Sorry. Any other suggestion ?

 Regards,    Gilbert.



Le 7 janv. 11 à 16:32, Jeff Squyres a écrit :

Well, bummer -- there goes my theory.  According to the hwloc info you posted earlier, this shows that OMPI is binding to the 1st hyperthread on each core; *not* to both hyperthreads on a single core.  :-\

It would still be slightly interesting to see if there's any difference when you run with --bind-to-core instead of paffinity_alone.



On Jan 7, 2011, at 9:56 AM, Gilbert Grosdidier wrote:

Yes, here it is :

mpirun -np 8 --mca mpi_paffinity_alone 1 /opt/software/SGI/hwloc/1.1rc6r3028/bin/hwloc-bind --get
0x00000001
0x00000002
0x00000004
0x00000008
0x00000010
0x00000020
0x00000040
0x00000080

Gilbert.

Le 7 janv. 11 à 15:50, Jeff Squyres a écrit :

Can you run with np=8?

On Jan 7, 2011, at 9:49 AM, Gilbert Grosdidier wrote:

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]

--
Jeff Squyres
jsquyres@cisco.com
For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/


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