mpirun -n 6 ./a.out

On Fri, Feb 15, 2013 at 10:30 PM, <users-request@open-mpi.org> wrote:

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Today's Topics:

1. Core ids not coming properly (Kranthi Kumar)
2. Re: Core ids not coming properly (Brice Goglin)

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Message: 1
Date: Fri, 15 Feb 2013 22:04:11 +0530
From: Kranthi Kumar <kranthipls@gmail.com>
Subject: [OMPI users] Core ids not coming properly
To: users@open-mpi.org
Message-ID:
<CAL97QqiVvW+GKBBFPJN_bBovhnUgXKvMg0-NTYpd=1rsVsPt=w@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

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
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Message: 2
Date: Fri, 15 Feb 2013 17:46:25 +0100
From: Brice Goglin <Brice.Goglin@inria.fr>
Subject: Re: [OMPI users] Core ids not coming properly
To: Open MPI Users <users@open-mpi.org>
Message-ID: <511E6661.40608@inria.fr>
Content-Type: text/plain; charset="iso-8859-1"

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 ?crit :
> 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
> users@open-mpi.org
> http://www.open-mpi.org/mailman/listinfo.cgi/users

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--
Kranthi