Ralph, I agree with what you stated in points 1-4. That is what we are looking for. I understand your point now about the non-MPI users too. :-)
Thanks, -cdm -----Original Message----- From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Ralph Castain Sent: Wednesday, November 29, 2006 8:01 AM To: Open MPI Users Subject: Re: [OMPI users] Pernode request Hi Chris Thanks for the patience and the clarification - much appreciated. In fact, I have someone that needs to learn more about the code base, so I think I will assign this to him. At the least, he will have to learn a lot more about the mapper! I have no problem with modifying the pernode behavior to deal with the case of someone specifying -np as you describe. It would be relatively easy to check. As I understand it, you want the behavior to be: 1. if no -np is specified, launch one proc/node across entire allocation 2. if -np n is specified AND n is less than the number of allocated nodes, then launch one proc/node up to the specified number. Of course, this is identical to just doing -np n -bynode, but that's immaterial. ;-) 3. if -np n is specified AND n is greater than the number of allocated nodes, error message and exit 4. add a -npernode n option that launches n procs/node, subject to the same tests above. Can you confirm? Finally, I think you misunderstood my comment about the MPI folks. Our non-MPI users couldn't care less about commonality of command line arguments across MPI implementations. Hence, I leave issues in that area to the MPI members of the team - they are the ones that decide how to deal with the myriad of different option syntaxes in the MPI community. Gives me too much of a headache! :-) Ralph
