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CFX User October 29, 2004 06:11

PVM or MPICH
 
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?

CFX User

deLuther October 29, 2004 08:21

Re: PVM or MPICH
 
Under Linux(UNIX) PVM preferable(but I am not sure about SGI or AIX). Under Windows MPICH is only option.

Glenn Horrocks October 31, 2004 18:08

Re: PVM or MPICH
 
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

deLuther November 1, 2004 04:43

Re: PVM or MPICH
 
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).

Narasimha Shastri November 3, 2004 00:03

Re: PVM or MPICH
 
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

Glenn Horrocks November 3, 2004 17:31

Re: PVM or MPICH
 
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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