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Subject: Re: [OMPI users] Problems with GATHERV on one process
From: Moreland, Kenneth (kmorel_at_[hidden])
Date: 2007-12-13 09:44:32


Excellent. Thanks.

-Ken

> -----Original Message-----
> From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]]
On
> Behalf Of Jeff Squyres
> Sent: Thursday, December 13, 2007 6:02 AM
> To: Open MPI Users
> Subject: Re: [OMPI users] Problems with GATHERV on one process
>
> Correct. Here's the original commit that fixed the problem:
>
> https://svn.open-mpi.org/trac/ompi/changeset/16360
>
> And the commit to the v1.2 branch:
>
> https://svn.open-mpi.org/trac/ompi/changeset/16519
>
>
> On Dec 12, 2007, at 2:43 PM, Moreland, Kenneth wrote:
>
> > Thanks Tim. I've since noticed similar problems with MPI_Allgatherv
> > and
> > MPI_Scatterv. I'm guessing they are all related. Do you happen to
> > know
> > if those are being fixed as well?
> >
> > -Ken
> >
> >> -----Original Message-----
> >> From: users-bounces_at_[hidden]
[mailto:users-bounces_at_[hidden]]
> > On
> >> Behalf Of Tim Mattox
> >> Sent: Tuesday, December 11, 2007 3:34 PM
> >> To: Open MPI Users
> >> Subject: Re: [OMPI users] Problems with GATHERV on one process
> >>
> >> Hello Ken,
> >> This is a known bug, which is fixed in the upcoming 1.2.5 release.
> >> We
> >> expect 1.2.5
> >> to come out very soon. We should have a new release candidate for
> > 1.2.5
> >> posted
> >> by tomorrow.
> >>
> >> See these tickets about the bug if you care to look:
> >> https://svn.open-mpi.org/trac/ompi/ticket/1166
> >> https://svn.open-mpi.org/trac/ompi/ticket/1157
> >>
> >> On Dec 11, 2007 2:48 PM, Moreland, Kenneth <kmorel_at_[hidden]>
wrote:
> >>> I recently ran into a problem with GATHERV while running some
> > randomized
> >>> tests on my MPI code. The problem seems to occur when running
> >>> MPI_Gatherv with a displacement on a communicator with a single
> > process.
> >>> The code listed below exercises this errant behavior. I have
tried
> > it
> >>> on OpenMPI 1.1.2 and 1.2.4.
> >>>
> >>> Granted, this is not a situation that one would normally run into
in
> > a
> >>> real application, but I just wanted to check to make sure I was
not
> >>> doing anything wrong.
> >>>
> >>> -Ken
> >>>
> >>>
> >>>
> >>> #include <mpi.h>
> >>>
> >>> #include <stdlib.h>
> >>> #include <stdio.h>
> >>>
> >>> int main(int argc, char **argv)
> >>> {
> >>> int rank;
> >>> MPI_Comm smallComm;
> >>> int senddata[4], recvdata[4], length, offset;
> >>>
> >>> MPI_Init(&argc, &argv);
> >>>
> >>> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
> >>>
> >>> // Split up into communicators of size 1.
> >>> MPI_Comm_split(MPI_COMM_WORLD, rank, 0, &smallComm);
> >>>
> >>> // Now try to do a gatherv.
> >>> senddata[0] = 5; senddata[1] = 6; senddata[2] = 7; senddata[3] =
> > 8;
> >>> recvdata[0] = 0; recvdata[1] = 0; recvdata[2] = 0; recvdata[3] =
> > 0;
> >>> length = 3;
> >>> offset = 1;
> >>> MPI_Gatherv(senddata, length, MPI_INT,
> >>> recvdata, &length, &offset, MPI_INT, 0, smallComm);
> >>> if (senddata[0] != recvdata[offset])
> >>> {
> >>> printf("%d: %d != %d?\n", rank, senddata[0], recvdata[offset]);
> >>> }
> >>> else
> >>> {
> >>> printf("%d: Everything OK.\n", rank);
> >>> }
> >>>
> >>> return 0;
> >>> }
> >>>
> >>> **** Kenneth Moreland
> >>> *** Sandia National Laboratories
> >>> ***********
> >>> *** *** *** email: kmorel_at_[hidden]
> >>> ** *** ** phone: (505) 844-8919
> >>> *** fax: (505) 845-0833
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> users mailing list
> >>> users_at_[hidden]
> >>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >>>
> >>
> >> --
> >> Tim Mattox, Ph.D. - http://homepage.mac.com/tmattox/
> >> tmattox_at_[hidden] || timattox_at_[hidden]
> >> I'm a bright... http://www.the-brights.net/
> >> _______________________________________________
> >> users mailing list
> >> users_at_[hidden]
> >> http://www.open-mpi.org/mailman/listinfo.cgi/users
> >
> >
> >
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> --
> Jeff Squyres
> Cisco Systems
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