On Thu, Jan 03, 2008 at 09:27:14AM -0500, Jeff Squyres wrote:
> > Another
> > problem is how multicast collective knows that all processes in a
> > communicator are reachable via the same network, do we have a
> > mechanism
> > in ompi to check this?
> Good question.
> Perhaps the common_of stuff could hang some data off the ompi_proc_t
> that can be read by any of-like component (btl openib, coll of
> multicast, etc.)...? This could contain a subnet ID, or perhaps a
> reachable flag, or somesuch.
But we calculate reachability inside BTL at modex stage so if HCA is not
used by BTL there is no reachability info for it.