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Subject: Re: [OMPI users] Limit to number of processes on one node?
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-03-03 11:59:10


It helps to have some idea what version you are talking about...

On Mar 3, 2010, at 9:51 AM, Prentice Bisbal wrote:

> Is there a limit on how many MPI processes can run on a single host?
>
> I have a user trying to test his code on the command-line on a single
> host before running it on our cluster like so:
>
> mpirun -np X foo
>
> When he tries to run it on large number of process (X = 256, 512), the
> program fails, and I can reproduce this with a simple "Hello, World"
> program:
>
> $ mpirun -np 256 mpihello
> mpirun noticed that job rank 0 with PID 0 on node juno.sns.ias.edu
> exited on signal 15 (Terminated).
> 252 additional processes aborted (not shown)
>
> I've done some testing and found that X <155 for this program to work.
> Is this a bug, part of the standard, or design/implementation decision?
>
>
> --
> Prentice Bisbal
> Linux Software Support Specialist/System Administrator
> School of Natural Sciences
> Institute for Advanced Study
> Princeton, NJ
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