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Subject: Re: [OMPI devel] Change in hostfile behavior
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-07-29 08:47:19


On Jul 29, 2008, at 8:43 AM, Ralph Castain wrote:

> Lenny's point is true - except for the danger of setting that mca
> param and its possible impact on ORTE daemons+mpirun - see other
> note in that regard. However, it would only be useful if the same
> user was doing it.
>
> I believe Tim was concerned about the case where two users are
> sharing nodes. There is no good solution for that case. Two mpiruns
> done by different users that share a node and who have no knowledge
> of the other's actions will cause collision.
>
> We should probably warn about that in our FAQ or something since
> that is a fairly common use-case - only thing I can think of is to
> recommend people default to running without affinity and only set it
> when they -know- they have sole use of their nodes.

I smell a ticket! :-)

     https://svn.open-mpi.org/trac/ompi/ticket/1425

-- 
Jeff Squyres
Cisco Systems