[mpich-discuss] spawning new processes with a hostfile

[Jeff Hammond]

If rckmpi is derived from MPICH and not MPICH2, then obviously you
should switch to rckmpi2.  MPICH is no longer supported.

Jeff

On Mon, Apr 16, 2012 at 11:52 AM, Umit <umitcanyilmaz at gmail.com> wrote:
> 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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-- 
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
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond (in-progress)
https://wiki.alcf.anl.gov/old/index.php/User:Jhammond (deprecated)
https://wiki-old.alcf.anl.gov/index.php/User:Jhammond(deprecated)