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

[Jayesh Krishna]

Hi,
 What is the binding used ? Did you try different bindings to see if that changes the performance (Does not specifying user defined binding increase/decrease perf)?
 More details please.

-Jayesh

----- Original Message -----
From: "Youri LACAN-BARTLEY" <youri.lacan-bartley at transvalor.com>
To: mpich-discuss at mcs.anl.gov
Sent: Wednesday, April 27, 2011 4:04:25 AM
Subject: [mpich-discuss] MPICH2 1.3 speed down on Windows 2008 R2





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 


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