Trivial Python code checking the intersection of the empty group with itself.
$ cat tmp.py from mpi4py import MPI empty = MPI.Group.Intersection(MPI.GROUP_EMPTY, MPI.GROUP_EMPTY) assert MPI.Group.Compare(empty, MPI.GROUP_EMPTY) in [MPI.IDENT, MPI.CONGRUENT] $ mpiexec -n 1 python tmp.py malloc debug: Request for 0 bytes (group/group.c, 456) -- 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
