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.
-- Gleb.