[mvapich-discuss] MPI_Comm_spawn broken in 2.1rc1

[Nicolas Niclausse]

Hari Subramoni a écrit le 09/03/2015 18:32 :
> Hi Nicolas,
> 
> Thanks for confirming that you are using the correct environment variable.
> Can you please provide us with a reproducer so that we can try it out locally?


Yes, i was able to reproduce the problem even on a very basic example taken
from:

http://mpi.deino.net/mpi_functions/mpi_comm_spawn.html


#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>

#define NUM_SPAWNS 2

int main( int argc, char *argv[] )
{
    int np = NUM_SPAWNS;
    int errcodes[NUM_SPAWNS];
    MPI_Comm parentcomm, intercomm;

    MPI_Init( &argc, &argv );
    MPI_Comm_get_parent( &parentcomm );
    if (parentcomm == MPI_COMM_NULL)
    {
        /* Create 2 more processes - this example must be called
spawn_example.exe for this to work. */
        MPI_Comm_spawn( "spawn_example", MPI_ARGV_NULL, np, MPI_INFO_NULL,
0, MPI_COMM_WORLD, &intercomm, errcodes );
        printf("I'm the parent.\n");
    }
    else
    {
        printf("I'm the spawned.\n");
    }
    fflush(stdout);
    MPI_Finalize();
    return 0;
}


-- 
Nicolas NICLAUSSE                          Service DREAM
INRIA Sophia Antipolis                     http://www-sop.inria.fr/
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