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.
Thanks, George. On Sun, Sep 28, 2014 at 6:29 AM, Lisandro Dalcin <dalc...@gmail.com> wrote: > On 22 April 2014 03:02, George Bosilca <bosi...@icl.utk.edu> wrote: > > Btw, the proposed validator was incorrect the first printf instead of > > > > printf(“[%d] rbuf[%d]=%2d expected:%2d\n”, rank, 0, recvbuf[i], size); > > > > should be > > > > printf(“[%d] rbuf[%d]=%2d expected:%2d\n”, rank, 0, recvbuf[0], size); > > > > I'm testing this with 1.8.3 after fixed the my incorrect printf, and > still get different results (and the nbcoll one is wrong) using one > process (for two or more everything's OK). > > $ mpicc -DNBCOLL=0 ireduce_scatter.c && mpiexec -n 1 ./a.out > [0] rbuf[0]= 1 expected: 1 > > $ mpicc -DNBCOLL=1 ireduce_scatter.c && mpiexec -n 1 ./a.out > [0] rbuf[0]=60 expected: 1 > > > -- > Lisandro Dalcin > ============ > Research Scientist > Computer, Electrical and Mathematical Sciences & Engineering (CEMSE) > Numerical Porous Media Center (NumPor) > King Abdullah University of Science and Technology (KAUST) > http://numpor.kaust.edu.sa/ > > 4700 King Abdullah University of Science and Technology > al-Khawarizmi Bldg (Bldg 1), Office # 4332 > Thuwal 23955-6900, Kingdom of Saudi Arabia > http://www.kaust.edu.sa > > Office Phone: +966 12 808-0459 >
