1) Bind-to-core is actually the default behavior of many MPIs today.
2) The proposed OMPI bind-to-socket default is less severe. In the
general case, it would allow multiple jobs to bind in the same way
without oversubscribing any core or socket. (This comment added to the
3) Defaults (if I understand correctly) can be set differently on each
Ralph Castain wrote:
There would be a "-do-not-bind" option that will prevent
us from binding processes to anything which should cover that situation.
My point was only that we would be changing the out-of-the-box behavior
to the opposite of today's, so all those such as yourself would now
have to add the -do-not-bind MCA param to your default MCA param file.
Doable - but it -is- a significant change in our out-of-the-box