Not sure why happened but it is indeed a regression. Will submit a fix now.
-Nathan On Jun 16, 2016, at 02:19 PM, Lisandro Dalcin <dalc...@gmail.com> wrote: Could you please check/confirm you are supporting passing split_type=MPI_UNDEFINED to MPI_Comm_split_type() ? IIRC, this is a regression from 2.0.0rc2. $ cat test-comm-split-type.py from mpi4py import MPI subcomm = MPI.COMM_WORLD.Split_type(MPI.UNDEFINED) assert subcomm == MPI.COMM_NULL $ mpiexec -n 1 python test-comm-split-type.py Traceback (most recent call last): File "test-comm-split-type.py", line 2, in <module> subcomm = MPI.COMM_WORLD.Split_type(MPI.UNDEFINED) File "MPI/Comm.pyx", line 214, in mpi4py.MPI.Comm.Split_type (src/mpi4py.MPI.c:95252) mpi4py.MPI.Exception: MPI_ERR_ARG: invalid argument of some other kind -- Lisandro Dalcin ============ Research Scientist Computer, Electrical and Mathematical Sciences & Engineering (CEMSE) Extreme Computing Research Center (ECRC) King Abdullah University of Science and Technology (KAUST) http://ecrc.kaust.edu.sa/ 4700 King Abdullah University of Science and Technology al-Khawarizmi Bldg (Bldg 1), Office # 0109 Thuwal 23955-6900, Kingdom of Saudi Arabia http://www.kaust.edu.sa Office Phone: +966 12 808-0459 _______________________________________________ devel mailing list de...@open-mpi.org Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/devel Link to this post: http://www.open-mpi.org/community/lists/devel/2016/06/19123.php
