Starting with the test comm_idup_mul.c, and increasing the value of NUM_ITER 10, I am seeing a fairly regular hang with a build from latest master (commit 25204 5/31). I am running with 2 ranks (1 per node) from SLURM (v2.6.5). I was able to see the behavior with srun -N 2 -n 2 ./comm_idup_mul (linking against SLURM PMI) and salloc -N 2 -n 2 mpiexec ./comm_idup_mul. I witnessed this with both the MXM and TCP netmods. I don't see any issues on single node runs. Thank you, -Dan For reference: Modified code from http://trac.mpich.org/projects/mpich/ticket/1935 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */ /* * * (C) 2012 by Argonne National Laboratory. * * See COPYRIGHT in top-level directory. * */ /* * * Test creating multiple communicators with MPI_Comm_idup. * */ #include <stdio.h> #include <mpi.h> #define NUM_ITER 10 int main(int argc, char **argv) { int i, rank; MPI_Comm comms[NUM_ITER]; MPI_Request req[NUM_ITER]; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &rank); for (i = 0; i < NUM_ITER; i++) MPI_Comm_idup(MPI_COMM_WORLD, &comms[i], &req[i]); MPI_Waitall(NUM_ITER, req, MPI_STATUSES_IGNORE); for (i = 0; i < NUM_ITER; i++) MPI_Comm_free(&comms[i]); if (rank == 0) printf(" No Errors\n"); MPI_Finalize(); return 0; } _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss