On Apr 28, 2006, at 6:19 PM, Ogden, Jeffry Brandon wrote:
How does the orterun launch determine the default number of slots per
node when running in a Torque job? Is there debug output from orterun
that will show me this?
The default number of slots will be the number of "cpus" assigned by
OMPI will use as many slots as Torque tells it to. So if you qsub with
ppn=2, then OMPI will use 2 slots per node; if you qsub with ppn=1, then
OMPI will use 1 slot per node, etc.
OMPI defaults to -byslot scheduling, so if you qsub with ppn=2/OMPI uses
2 slots per node, OMPI will schedule MPI_COM
