Hi Daniel, Thanks for reporting the bug. I can reproduce it on my desktop. I will work on a fix. You can track the progress here. http://trac.mpich.org/projects/mpich/ticket/2269 -- Huiwei Lu Postdoc Appointee Mathematics and Computer Science Division Argonne National Laboratory http://www.mcs.anl.gov/~huiweilu/ On Tue, Jun 2, 2015 at 4:32 PM, Daniel Pou <[email protected]> wrote:

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; }

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