[MPICH] Switching to MPICH2

[Hans Nyberg]

I have been using MPICH 1.2.6 on a small cluster of RedHat 9
computers, but am trying to switch over to MPICH2.  The following
command with MPICH1 is working fine:

/MPICH1_path/mpirun -machinefile file -np 5 executable

but when I try to bring that over to MPICH2, using this command:

/MPICH2_path/mpiexec -machinefile file -n 5 executable

I get five copies of the executable running at once.  I have the
mpdring set up, but can't figure out what I'm doing wrong.

Thanks!
Hans Nyberg