[Beowulf] MPI questions

[Sean Dilda]

Jake Thebault-Spieker wrote:
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> Hi all,
> 
> 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? 

You are asking questions specific to MPI implementations, not MPI 
itself.  MPI is an API definition.  That's it.  There are several 
different implementations of MPI.  Two of the most common are MPICH and 
LAM/MPI.

> Is the debian
> package MPICH the correct one?

Although I don't use debian, that should work.  If its MPICH 1, you 
don't need any daemons running.  It'll launch the jobs through rsh or 
ssh (depending on how its compiled).