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Parallel with Windoze, speed difference between PV

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Old   March 9, 2005, 08:43
Default Parallel with Windoze, speed difference between PV
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Charles
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I am running CFX 5.7.1 parallel on a mixed cluster of machines, all with Windows. The cluster consists of a dual Xeon 3.6, a quad Opteron 248 and 5 3.2 GHz P4's. Some of the tests that I have run have shown a dramatic improvement in wallclock time when going from PVM to MPI. Can anybody throw some light on this? I vaguely recall somebody once mentioning that PVM on Windows is not nearly as quick as on Linux?
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Old   March 9, 2005, 17:24
Default Re: Parallel with Windoze, speed difference betwee
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Glenn Horrocks
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Hi,

On windows machines MPICH for windows is usually much faster than PVM. In my benchmarking running MPICH on windows is roughly the same speed as running PVM on Linux. I have no idea why the difference, but that's the end result.

Glenn Horrocks
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Old   March 9, 2005, 22:42
Default Re: Parallel with Windoze, speed difference betwee
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Neale
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The PVM implementation really sucks on Windows and is especially bad when you run on dual Xeons. MPICH is better but is less stable.

On a quad opteron you should be seeing superlinear performance if your case is big enough (PVM or MPICH)

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Old   March 10, 2005, 02:25
Default Re: Parallel with Windoze, speed difference betwee
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Charles
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Thanks guys, your comments are very much in line with what I've been observing.
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