[MPICH] FW: Mpich2 submission question.

[Galton, Simon]

Sure,

This may be specific to the program I'm running, MCNP, but when you run

mpiexec -n 2 mcnp5

what you see is that two processes are created on the cluster.  The first
process accumulates no cpu, the second runs normally.  The result is
accurate.

As you continue to add CPUs nothing changes -- the first process is always
"idle".  If you specifiy -n 1 however, the first process is "active".

Any thoughts?
Simons 

-----Original Message-----
From: Rajeev Thakur [mailto:thakur at mcs.anl.gov] 
Sent: March 7, 2006 5:51 PM
To: galtons at aecl.ca
Cc: mpich-discuss at mcs.anl.gov
Subject: RE: [MPICH] FW: Mpich2 submission question.

Can you explain what you mean with an example? For example, if you are
running the cpi example from the examples directory, with "mpiexec -n 2 cpi"

Rajeev 

> From: "Galton, Simon" <galtons at aecl.ca>
> Subject: Mpich2 submission question.
> Date: Tue, 7 Mar 2006 09:46:02 -0500
> 
> Howdy, folks.
> 
> I've been scouring the mpich2 documentation, and I've read over the 
> source code, and I seem to be missing something, somewhere... :)
> 
> I notice that when you submit an mpich2 job, the first process 
> accumulates no CPU (unless you submit a 1-cpu job).  I expect it's 
> just a control process.
> 
> Is there anything I can do to make this an "active" process?
> 
> Simon

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