[mpich-discuss] MPI_Comm_idup hang with multiple nodes

[Huiwei Lu]

Hi Daniel,

The ticket has been fixed in the latest MPICH master (or you can check out
the nightly tarballs). Please let me know if it fixes your issues.

Thanks,

--
Huiwei Lu
Postdoc Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
http://www.mcs.anl.gov/~huiweilu/

On Tue, Jun 2, 2015 at 5:04 PM, Huiwei Lu <huiweilu at mcs.anl.gov> wrote:

> 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 <daniel.pou at gmail.com> 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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>
>
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