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Old   October 29, 2004, 06:11
Default PVM or MPICH
  #1
CFX User
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Hi

Please could someone explain the difference between PVM and MPICH when running CFX 5.7 in parallel.

I'm assuming both can be used for running parallel jobs. Which one should I use?

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Old   October 29, 2004, 08:21
Default Re: PVM or MPICH
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deLuther
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Under Linux(UNIX) PVM preferable(but I am not sure about SGI or AIX). Under Windows MPICH is only option.
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Old   October 31, 2004, 18:08
Default Re: PVM or MPICH
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Glenn Horrocks
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Hi,

deLuther is probably right, but you should try both (if you can) and judge for yourself. Both methods have advantages and disadvantages.

Glenn Horrocks
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Old   November 1, 2004, 04:43
Default Re: PVM or MPICH
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deLuther
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If PVM will work well under windows, then I will use it everytime(because it much more stable than mpich), but currently it has one greate disadvatage - speed... With each additional machine overal time is increasing. (For instance two machines is slower than one and so on).
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Old   November 3, 2004, 00:03
Default Re: PVM or MPICH
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Narasimha Shastri
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Agreed with whatever is said earlier. However, one more thing to be taken care of is not to use MPICH while running network parallel. CFX 5.7 Decumentation explicitly says MPI is reccomonded only for parallel jobs being run on single machine with multiple processors. - NS
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Old   November 3, 2004, 17:31
Default Re: PVM or MPICH
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Glenn Horrocks
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Hi,

I disagree with Narasimha's comment that MPICH does not work distributed parallel. It works fine, I use it regularly. It does have some stability problems (as mentioned by deLuther), but as long as the job does not crash (as any properly developed simulation shouldn't) it works just fine.

Glenn Horrocks
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