Good Afternoon,
I'm trying to diagnose an issue I've been having with MPI_Comm_Spawn. When I
run the simple example program:
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
int main( int argc, char *argv[] )
{
int np[2] = { 1, 1 };
int errcodes[2];
MPI_Comm parentcomm, intercomm;
char *cmds[2] = { "spawn_example", "spawn_example" };
MPI_Info infos[2] = { MPI_INFO_NULL, MPI_INFO_NULL };
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_multiple( 2, cmds, MPI_ARGVS_NULL, np, infos, 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;
}
I get the output:
--------------------------------------------------------------------------
It looks like MPI_INIT failed for some reason; your parallel process is
likely to abort. There are many reasons that a parallel process can
fail during MPI_INIT; some of which are due to configuration or environment
problems. This failure appears to be an internal failure; here's some
additional information (which may only be relevant to an Open MPI
developer):
ompi_dpm_dyn_init() failed
--> Returned "Unreachable" (-12) instead of "Success" (0)
--------------------------------------------------------------------------
I'm using OpenMPI 3.1.1. I know past versions (like 2.x) had a similar issue,
but I believe those were fixed by this version. Is there something else that
can cause this?
Thank you,
Kathleen
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