On Jul 29, 2008, at 8:43 AM, Ralph Castain wrote:
Lenny's point is true - except for the danger of setting that mca
param and its possible impact on ORTE daemons+mpirun - see other
note in that regard. However, it would only be useful if the same
user was doing it.
I believe Tim was concerned about the case where two users are
sharing nodes. There is no good solution for that case. Two mpiruns
done by different users that share a node and who have no knowledge
of the other's actions will cause collision.
We should probably warn about that in our FAQ or something since
that is a fairly common use-case - only thing I can think of is to
recommend people default to running without affinity and only set it
when they -know- they have sole use of their nodes.
I smell a ticket! :-)
https://svn.open-mpi.org/trac/ompi/ticket/1425
--
Jeff Squyres
Cisco Systems
