[mpich-discuss] spawning new processes with a hostfile

[Umit]

Hi Jeff,

Yes I am running on scc with rckmpi not rckmpi2.




Best Regards,


On 16 April 2012 16:14, Jeff Hammond <jhammond at alcf.anl.gov> wrote:

> It seems that you are running on an Intel SCC.  Is this true?
>
> Which version of RCKMPI are you running?  It seems there are a few
> MPICH-derived implementations of MPI for SCC.
>
> Some people at Argonne have SCC access (I am one of them) but those of
> us that do are not necessarily the people qualified to debug the MPI
> process manager on SCC.  I am most certainly not qualified to do this.
>
> Jeff
>
> On Mon, Apr 16, 2012 at 8:14 AM, Umit <umitcanyilmaz at gmail.com> wrote:
> > Hello all,
> >
> >
> > There are some spawn commands in my program. Now I want to specify the
> nodes
> > of my new spawned processes.  I am trying to use a hostfile for this
> but  I
> > couldn’t do it successfully.  New processes are still spawned on next
> > available nodes.
> >
> > I added my code and outputs of my console.
> >
> > My hostfile:
> >
> > root at rck00:~> cat /shared/mpihosts
> >
> > rck03
> >
> > rck04
> >
> > rck05
> >
> >
> >
> > Can somebody help me? What is the problem? Can this be a bug?
> >
> >
> > Here is my code and output of my program:
> >
> > #include "mpi.h"
> >
> > #include <stdio.h>
> >
> > #include <stdlib.h>
> >
> >
> >
> > #define NUM_SPAWNS 3
> >
> >
> >
> > int main( int argc, char *argv[] )
> >
> > {
> >
> >     int errcodes[NUM_SPAWNS];
> >
> >     MPI_Comm parentcomm, intercomm;
> >
> >     int len;
> >
> >     char name[MPI_MAX_PROCESSOR_NAME];
> >
> >     int rank;
> >
> >
> >
> >     MPI_Init( &argc, &argv );
> >
> >     MPI_Comm_get_parent( &parentcomm );
> >
> >     MPI_Comm_rank(MPI_COMM_WORLD,&rank);
> >
> >
> >
> >     if (parentcomm == MPI_COMM_NULL)
> >
> >     {
> >
> >             MPI_Info info;
> >
> >             MPI_Info_create( &info );
> >
> >             MPI_Info_set(info, "hostfile", "/shared/mpihosts");
> >
> >
> >
> >             MPI_Comm_spawn( "/shared/spawn/./spawn", MPI_ARGV_NULL,
> > NUM_SPAWNS, info, 0, MPI_COMM_WORLD, &intercomm, errcodes );
> >
> >
> >
> >             MPI_Get_processor_name(name, &len);
> >
> >             printf("I am parent process %d on %s.  \n", rank,  name);
> >
> >     }
> >
> >     else
> >
> >     {
> >
> >             MPI_Get_processor_name(name, &len);
> >
> >             printf("I am a spawned process %d on %s.\n", rank,  name);
> >
> >     }
> >
> >     fflush(stdout);
> >
> >     MPI_Finalize();
> >
> >     return 0;
> >
> > }
> >
> >
> >
> > output of my program:
> >
> > root at rck00:~> mpirun -np 1 /shared/spawn/./spawn
> >
> > I am parent process 0 on rck00.
> >
> > I am a spawned process 0 on rck01.
> >
> > I am a spawned process 1 on rck02.
> >
> > I am a spawned process 2 on rck03.
> >
> >
> >
> >
> >
> > Thanks in advance,
> >
> >
> >
> >
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>
>
>
> --
> Jeff Hammond
> Argonne Leadership Computing Facility
> University of Chicago Computation Institute
> jhammond at alcf.anl.gov / (630) 252-5381
> http://www.linkedin.com/in/jeffhammond
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