Indeed, that's exactly the problem. Just tested it, and with the alignment fix, the segfault goes away. Thanks. Dmitriy On Fri, Aug 19, 2016 at 12:48 PM, Eric A. Borisch <[email protected]> wrote:

This might be the alignment bug. http://lists.mpich.org/pipermail/discuss/2016-May/004764.html

You can try the trivial patch yourself to find out. It was already addressed in head; there were comments that a patched version might be cut...

- Eric

On Fri, Aug 19, 2016 at 11:43 AM, Dmitriy Morozov <[email protected]> wrote:

...

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

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