I think that in pure OpenMPI environment (without any resorce manager) you should be able to run applications like this:

mpirun -np 2 mpi_executable
or
mpirun -np 4 -machinefile machines.list mpi_executable

where machines.list contains a list of your computers identified by their host names.
The former command should run the program locally on 2 processors/cores, the latter
one on those specified in the list.

Regards,
Jozef

On Tue, Apr 15, 2008 at 6:38 PM, Cally K <kalpana0611@gmail.com> wrote:
hi, am beginner in openmpi
 
 
could anyone tell me how do i run programs in open mpi on smp.. as in do I have to do any changes in hostfile ... like in mpich -- I write
 
server:2
 
how do I do it openmpi
 

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