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Subject: Re: [OMPI users] Potential bug in creating MPI_GROUP_EMPTY handling
From: Jack Bryan (dtustudy68_at_[hidden])
Date: 2011-03-18 02:07:22


> Date: Thu, 17 Mar 2011 23:40:31 +0100
> From: dominik.goeddeke_at_[hidden]
> To: users_at_[hidden]
> Subject: Re: [OMPI users] Potential bug in creating MPI_GROUP_EMPTY handling
>
> glad we could help and the two hours of stripping things down were
> effectively not wasted. Also good to hear (implicitly) that we were not
> too stupid to understand the MPI standard...
>
> Since to the best of my understanding, our workaround is practically
> overhead-free, we went ahead and coded everything up analogously to the
> workaround, i.e. we don't rely on / wait for an immediate fix.
>
> Please let us know if further information is needed.
>
> Thanks,
>
> dom
>
> On 03/17/2011 05:10 PM, Jeff Squyres wrote:
> > Sorry for the late reply, but many thanks for the bug report and reliable reproducer.
> >
> > I've confirmed the problem and filed a bug about this:
> >
> > https://svn.open-mpi.org/trac/ompi/ticket/2752
> >
> >
> > On Mar 6, 2011, at 6:12 PM, Dominik Goeddeke wrote:
> >
> >> The attached example code (stripped down from a bigger app) demonstrates a way to trigger a severe crash in all recent ompi releases but not in a bunch of latest MPICH2 releases. The code is minimalistic and boils down to the call
> >>
> >> MPI_Comm_create(MPI_COMM_WORLD, MPI_GROUP_EMPTY,&dummy_comm);
> >>
> >> which isn't supposed to be illegal. Please refer to the (well-documented) code for details on the high-dimensional cross product I tested (on ubuntu 10.04 LTS), a potential workaround (which isn't supposed to be necessary I think) and an exemplary stack trace.
> >>
> >> Instructions: mpicc test.c -Wall -O0&& mpirun -np 2 ./a.out
> >>
> >> Thanks!
> >>
> >> dom
> >>
> >>
> >> <test.c>_______________________________________________
> >> users mailing list
> >> users_at_[hidden]
> >> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >
>
>
> --
> Dr. Dominik Göddeke
> Institut für Angewandte Mathematik
> Technische Universität Dortmund
> http://www.mathematik.tu-dortmund.de/~goeddeke
> Tel. +49-(0)231-755-7218 Fax +49-(0)231-755-5933
>
>
>
>
>
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