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Subject: Re: [OMPI devel] Exit status
From: Ken Lloyd (kenneth.lloyd_at_[hidden])
Date: 2011-04-14 09:43:05


Point well made, Nick. In other words, irrespective of OS or language,
are we citing the need for "application correcting code" from OpenMPI,
(relocate a/o retry) similar to ECC in memory?

Ken

On Thu, 2011-04-14 at 14:31 +0100, N.M. Maclaren wrote:

> On Apr 14 2011, Ralph Castain wrote:
> >>
> >>> ... It's hopeless, and whatever you do will be wrong for many
> >>> people. ...
> >>
> >> I think that sums it up pretty well. :-)
> >>
> >> It does seem a little strange that the scenario you describe somewhat
> >> implies that one process is calling MPI_Finalize loooong before the
> >> others do. Specifically, the user is concerned with tying up resources
> >> after one process has called Finalize -- which implies that the others
> >> may continue on for a while. It's not invalid, of course, but it is a
> >> little unusual.
> >
> > I'm finding it more common than we thought. Note that I didn't say that
> > one process called MPI_Finalize before the others. In this case, they
> > call it fairly close together, but the individual processes continue
> > running for quite some time, or until they determine that something is
> > wrong and exit with non-zero status.
>
> Nobody is denying that it is common. Now, what happens when you encounter
> a language or compiler that uses return codes for mere warnings (e.g.
> ignored IEEE 754 flags, as stated to be desirable by LIA-1)? Bang!
>
> Remember that C is not the universe and many languages use MPI via the
> C interface, but do not let C control their model.
>
> Regards,
> Nick Maclaren.
>
> _______________________________________________
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> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel

=====================
Kenneth A. Lloyd
CEO - Director of Systems Science
Watt Systems Technologies Inc.
www.wattsys.com
kenneth.lloyd_at_[hidden]

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