Good morning, I'm trying to "port" an Open MPI script with MPICH and I'm having some trouble. I've got a few questions. What is the form of the "-hosts" option? Is it something like '-hosts node1: 4 node2: 4

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Good morning,

I'm trying to "port" an Open MPI script with MPICH and I'm having some trouble. I've got a few questions.

What is the form of the "-hosts" option? Is it something like '-hosts node1:4 node2:4 node3:4 ...'?
The Open MPI script has an option "-map-by ppr:4:node" that tells it to run 4 processes per node and then it runs as many nodes as needed to meet the number of processes. How can I do this in MPICH?

Thanks for the help!

Jeff