+1

In addition, you might want to upgrade to Open MPI 1.6.x -- 1.4.x is fairly 
ancient. 1.6.x's mpirun also has a --report-bindings option which tells you 
where procs are bound.  For example:

    mpirun --bind-to-core --report-bindings ...etc.


On Feb 15, 2013, at 11:46 AM, Brice Goglin <brice.gog...@inria.fr> wrote:

> IntelMPI binds processes by default, while OMPI doesn't. What's your 
> mpiexec/mpirun command-line?
> 
> Brice
> 
> 
> 
> Le 15/02/2013 17:34, Kranthi Kumar a écrit :
>> Hello Sir 
>> 
>> Here below is the code which I wrote using hwloc for getting the bindings of 
>> the processes. 
>> I tested this code on SDSC Gordon Super Computer which has Open MPI 1.4.3 
>> and on TACC Stampede which uses intel's MPI library IMPI. 
>> With Open MPI I get all the core ids for all the processes as 0. Using Intel 
>> MPI library I get different coreids. I tried even binding the processes 
>> in the command line using taskset. Open MPI gives me core id 0 for all the 
>> processes whereas IMPI gives me correct bindings. 
>> Please look into this
>> 
>> 
>> #include <stdio.h>
>> #include <sched.h>
>> #include <math.h>
>> #include "mpi.h"
>> #include <hwloc.h>
>> int main(int argc, char* argv[])
>> {
>>     int rank, size;
>>     cpu_set_t mask;
>>     long num;
>>     int proc_num(long num);
>> 
>>     hwloc_topology_t topology;
>>     hwloc_cpuset_t cpuset;
>>     hwloc_obj_t obj;
>> 
>>     MPI_Init(&argc, &argv);
>>     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>>     MPI_Comm_size(MPI_COMM_WORLD, &size);
>> 
>>     hwloc_topology_init ( &topology);
>>     hwloc_topology_load ( topology);
>> 
>>     hwloc_bitmap_t set = hwloc_bitmap_alloc();
>>     hwloc_obj_t pu;
>>     int err;
>> 
>>     err = hwloc_get_proc_cpubind(topology, getpid(), set, 
>> HWLOC_CPUBIND_PROCESS);
>>     if (err) {
>>     printf ("Error Cannot find\n"), exit(1);
>>     }
>> 
>>     pu = hwloc_get_pu_obj_by_os_index(topology, hwloc_bitmap_first(set));
>>     printf ("Hello World, I am %d and pid: %d 
>> coreid:%d\n",rank,getpid(),hwloc_bitmap_first(set));
>> 
>>     hwloc_bitmap_free(set);
>>     MPI_Finalize();
>>     fclose(stdout);
>>     return 0;
>> }
>> Thank You
>> -- 
>> Kranthi 
>> 
>> _______________________________________________
>> users mailing list
>> 
>> us...@open-mpi.org
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> 
> _______________________________________________
> users mailing list
> us...@open-mpi.org
> http://www.open-mpi.org/mailman/listinfo.cgi/users


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Jeff Squyres
jsquy...@cisco.com
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