When I compile and run the following code on my mac (running OS X 10.11.6, El Capitan), with MPICH 3.2 built from source (via Homebrew), I get a segfault in MPI_Comm_split. If I do the same with a recent clone from the git repository (specifically, d8bb1df), everything works fine. I'm wondering if this is a known problem in 3.2. Thanks. Dmitriy // test-mpi.c #include <mpi.h> int main(int argc, char** argv) { MPI_Init(&argc, &argv); MPI_Comm world = MPI_COMM_WORLD; int rank; MPI_Comm_rank(world, &rank); MPI_Comm local; MPI_Comm_split(world, rank, 0, &local); MPI_Finalize(); } mpicc test-mpi.c -o test-mpi mpirun -n 2 ./test-mpi _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss