Jeff Squyres wrote:
If you're exchanging data at the end of an iteration, then you effectively have a synchronization anyway -- no need for an extra barrier synchronization.
Ralph Castain wrote:
Ummm....not to put gasoline on the fire, but...if the data exchange is blocking, why do you need to call a barrier op first? Just use an appropriate blocking data exchange call (collective or whatever) and it will "barrier" anyway.
I could also imagine processes interacting/communicating/whatever via some other mechanism than MPI calls. Heck, OMPI itself is an example. Maybe they interact via a file system or something.
Anyhow, I agree with the majority sentiment: single raised eyebrow if there's an app that beats heavily on Barrier.
