[OMPI users] mpirun -np 4 hello_world; on a eight processor shared memory machine produces wrong output

[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 
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