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Subject: Re: [OMPI users] mpirun -np 4 hello_world; on a eight processor shared memory machine produces wrong output
From: Pankatz, Klaus (klaus.pankatz_at_[hidden])
Date: 2010-04-23 08:41:57


Yeah, I sure that I use the right mpirun.

which mpirun leads to /usr/users/pankatz/OPENmpi/bin/mpirun which is the right one.
________________________________________
Von: users-bounces_at_[hidden] [users-bounces_at_[hidden]] im Auftrag von Terry Dontje [terry.dontje_at_[hidden]]
Gesendet: Freitag, 23. April 2010 14:29
An: Open MPI Users
Betreff: Re: [OMPI users] mpirun -np 4 hello_world; on a eight processor shared memory machine produces wrong output

This looks like you are using an mpirun or mpiexec from mvapich to run an executable compiled with OMPI. Can you make sure that you are using the right mpirun?

--td

Pankatz, Klaus wrote:

Yes, I did that.

It ist basically the same problem with a Fortran version of this little program. With that I used the mpif90 command of openMPI.
________________________________________
Von: users-bounces_at_[hidden]<mailto:users-bounces_at_[hidden]> [users-bounces_at_[hidden]<mailto:users-bounces_at_[hidden]>] im Auftrag von Reuti [reuti_at_[hidden]<mailto:reuti_at_[hidden]>]
Gesendet: Freitag, 23. April 2010 14:15
An: Open MPI Users
Betreff: Re: [OMPI users] mpirun -np 4 hello_world; on a eight processor shared memory machine produces wrong output

Hi,

Am 23.04.2010 um 14:06 schrieb Pankatz, Klaus:

Hi all,

there's a problem with openMPI on my machine. When I simply try to run this little hello_world-program on multiple processors, the output isn't as expected:
*****
C code:
#include <mpi.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
 int size,rank;
 char hostname[50];
 MPI_Init(&argc,&argv);
 MPI_Comm_rank(MPI_COMM_WORLD, &rank); //Who am I?
 MPI_Comm_size(MPI_COMM_WORLD, &size); //How many processes?
 gethostname (hostname, 50);
 printf ("Hello World! I'm number %2d of %2d running on host %s\n",
rank, size, hostname);
 MPI_Finalize();
 return 0;
}
****

Command: mpirun -np 4 a.out

the mpirun (better, use: mpiexec) is the one from the Open MPI, and you also used its version mpicc to compile the program?

-- Reuti

Output:
Hello World! I'm number 0 of 1 running on host marvin
Hello World! I'm number 0 of 1 running on host marvin
Hello World! I'm number 0 of 1 running on host marvin
Hello World! I'm number 0 of 1 running on host marvin

It should be more or less:
Hello World! I'm number 1 of 4 running on host marvin
Hello World! I'm number 2 of 4 running on host marvin
....

OpenMPI-version 1.4.1 compiled with Lahey Fortran 95 (lf95).
OpenMPI was compiled "out of the box" only changing to the Lahey compiler with a setenv $FC lf95

The System: Linux marvin 2.6.27.6-1 #1 SMP Sat Nov 15 20:19:04 CET 2008 x86_64 GNU/Linux

Compiler: Lahey/Fujitsu Linux64 Fortran Compiler Release L8.10a

Thanks very much!
Klaus

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