Lisandro, i fixed this in the master and made a PR for v1.8.
this is a one liner, and you can find it at https://github.com/ggouaillardet/ompi-release/commit/0e478c1191715fff37e4deb56f8891774db62775 Cheers, Gilles On 2014/12/23 23:43, Lisandro Dalcin wrote: > On 28 September 2014 at 19:13, George Bosilca <bosi...@icl.utk.edu> wrote: >> Lisandro, >> >> Good catch. Indeed the MPI_Ireduce_scatter was not covering the case where >> MPI_IN_PLACE was used over a communicator with a single participant. I >> pushed a patch and schedule it for 1.8.4. Check >> https://svn.open-mpi.org/trac/ompi/ticket/4924 for more info. >> > While your change fixed the issues when using MPI_IN_PLACE, now 1.8.4 > seems to fail when in-place is not used. > > Please try the attached example: > > $ mpicc -DNBCOLL=0 ireduce_scatter.c > $ mpiexec -n 2 ./a.out > [0] rbuf[0]= 2 expected: 2 > [0] rbuf[1]= 0 expected: 0 > [1] rbuf[0]= 2 expected: 2 > [1] rbuf[1]= 0 expected: 0 > $ mpiexec -n 1 ./a.out > [0] rbuf[0]= 1 expected: 1 > > > $ mpicc -DNBCOLL=1 ireduce_scatter.c > $ mpiexec -n 2 ./a.out > [0] rbuf[0]= 2 expected: 2 > [0] rbuf[1]= 0 expected: 0 > [1] rbuf[0]= 2 expected: 2 > [1] rbuf[1]= 0 expected: 0 > $ mpiexec -n 1 ./a.out > [0] rbuf[0]= 0 expected: 1 > > The last one is wrong. Not sure what's going on. Am I missing something? > > > > > _______________________________________________ > devel mailing list > de...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/devel > Link to this post: > http://www.open-mpi.org/community/lists/devel/2014/12/16718.php
