[mpich-discuss] Error with MPI_Comm_spawn on MPICH2

[Shah, Mrunal J]

Using 1.0.8
Running on a x86_64 machine

The test program:

#include "mpi.h"

int main(int argc, char **argv)
{
        int world_size, flag, myRank;
        MPI_Comm everyone;

        MPI_Init(&argc, &argv);
        MPI_Comm_size(MPI_COMM_WORLD, &world_size);
        MPI_Comm_rank(MPI_COMM_WORLD, &myRank);

        printf("world_size %d\n", world_size);

        MPI_Comm_spawn("./workertest", MPI_ARGV_NULL, world_size, MPI_INFO_NULL, 0, MPI_COMM_WORLD, &everyone, MPI_ERRCODES_IGNORE);

        printf("hello from master %d", myRank);
        MPI_Finalize();
        return 0;
}

Thanks,
Mrunal

----- Original Message -----
From: "Rajeev Thakur" <thakur at mcs.anl.gov>
To: mpich-discuss at mcs.anl.gov
Sent: Monday, November 24, 2008 11:04:03 PM GMT -05:00 US/Canada Eastern
Subject: Re: [mpich-discuss] Error with MPI_Comm_spawn on MPICH2

Which version of MPICH2 are you using and on what platform? Please send us a
small test program if you can.

Rajeev 

> -----Original Message-----
> From: mpich-discuss-bounces at mcs.anl.gov 
> [mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Shah, Mrunal J
> Sent: Monday, November 24, 2008 8:32 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: [mpich-discuss] Error with MPI_Comm_spawn on MPICH2
> 
> Hi All,
> 
> I am having issues with spawning processes using MPI_Comm_spawn.
> Using a simple example for spawning processes:
> 
>  MPI_Comm_spawn("./workertest", MPI_ARGV_NULL, world_size, 
> MPI_INFO_NULL, 0, MPI_COMM_WORLD, &everyone, MPI_ERRCODES_IGNORE);
> 
> The error I get is:
> Fatal error in MPI_Comm_spawn: Internal MPI error!, error stack:
> MPI_Comm_spawn(130)............: 
> MPI_Comm_spawn(cmd="./workertest", argv=(nil), maxprocs=4, 
> MPI_INFO_NULL, root=0, MPI_COMM_WORLD, 
> intercomm=0x7fbffff6ac, errors=(nil)) failed
> MPIDI_Comm_spawn_multiple(172).:
> MPID_Open_port(65).............:
> MPIDI_CH3_Get_business_card(99): Internal MPI error!universe_size 1
> 
> I believe this could be a machine specific error, since 
> running the same code on another machine with a different 
> implementation of MPI (OpenMPI) does not give any errors.
> But I am not sure what I am missing here.
> 
> Thanks!
> Mrunal
>