It depends - if you have an environment like slurm, sge, or torque, then we use that to launch our daemons on each node. Otherwise, we default to using ssh.

Once the daemons are launched, we then tell the daemons what processes each is to run. So it is a two-stage launch procedure.

On Apr 26, 2010, at 2:22 AM, Leo P. wrote:

Hi everyone, 

I wanted to know how OpenMPI launches a MPI  process in a cluster environment. I am assuming if the process lifecycle management it will be using rsh.

Anyhelp would be greatly appreciated. 

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