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 <kmo...@sandia.gov> 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: kmo...@sandia.gov > ** *** ** phone: (505) 844-8919 > *** fax: (505) 845-0833 > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > -- Tim Mattox, Ph.D. - http://homepage.mac.com/tmattox/ tmat...@gmail.com || timat...@open-mpi.org I'm a bright... http://www.the-brights.net/
