Thanks for the bug report! We discussed this in person at SC08 last
week, and the thread moved to the devel list, here:
http://www.open-mpi.org/community/lists/devel/2008/11/4948.php
On Nov 16, 2008, at 7:41 PM, Peter Kjellstrom wrote:
Problem description:
Elements from all ranks are gathered correctly except for the
element belonging to the root/target rank of the gather operation
when using certain custom MPI-datatypes (see reproducer code).
The bug can be toggled by commenting/uncommenting line 11 in
the .F90-file.
Even though all this is for MPI_Gather the same seems to go for
MPI_Gatherv
too.
I have verified the bad behaviour with several OpenMPI versions from
1.2.3 to
1.3b2. Correct behaviour has been observed on mvapich2 and
PlatformMPI. Both
gfortran and ifort has been tried.
Attached files:
BUILD Build instructions
RUN Run instructions
mpi_gather_test.F90 Reproducer source code
4rank_bad_output.txt Bad output
4rank_expected_output.txt Good output
/Peter
<
BUILD
.txt
>
<
RUN
.txt
>
<
mpi_gather_test
.F90
>
<
4rank_bad_output
.txt
>
<
4rank_expected_output
.txt>_______________________________________________
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--
Jeff Squyres
Cisco Systems
