[Beowulf] MPI questions

Jake Thebault-Spieker jake at spiekerfamily.com
Mon Apr 4 19:42:56 EDT 2005


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I guess my question is how do I use MPI? Will the MPICH implementation
work with a program written for MPI? Does one need MPICH on all of the
nodes, or just the master node?

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Jake Thebault-Spieker



Jack wrote:

>
>> What is the difference between MPI? Does MPI need to be running on all
>> the nodes or just the node that the job was started on? Is the debian
>> package MPICH the correct one?
>>
> The various MPI distributions (OpenMPI, LamMPI, MPICH) all attempt
conform to a set of MPI standards. Thus, sometimes they differ slightly
in implementation, but normally a code will run on all of them (though
you will need to compile it usuing the correct libraries).
>
> About the running on the nodes question: when, for instance in the Lam
distribution, you say "lamboot <machine_list>", it goes out and starts
the "lamd" daemon. Then, when you say "mpirun whatever", all these
daemons on the hosts each start their process with the correct rank
number, and they deal with the transactions between nodes.
>
> Is that the correct one? Sure. It will probably work, though we have no
idea exactly what you want to do.
>
> There are good descriptions of this sort of thing around, take a look
on The Oracle (Google).
>
> Have fun!
>
> -Jack Carrozzo
> http://www.crepinc.com/
>
>
>
>
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