[mpich-discuss] MPICH2 1.3 speed down on Windows 2008 R2

[Youri LACAN-BARTLEY]

Hi,

 

I'm currently benchmarking a 32 core machine with four Intel X7560
running Windows 2008 R2.

I've noticed severe speed down when running on all 32 cores at once
using user defined binding and the nemesis channel.

Would anyone have any idea why this might be the case.

I've run the exact same hardware with the same software running CentOS 5
and OpenMPI 1.4 and in that case the results show a regular speed up as
expected.

 

Am I hitting a specific MPICH2 issue or has this rather got something to
do with Windows?

 

Kind regards,

 

Youri LACAN-BARTLEY

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20110427/252dc010/attachment-0001.htm>