Yes, though the degree of impact obviously depends on the messaging pattern of the app.
On Oct 31, 2013, at 2:50 AM, MM <finjulh...@gmail.com> wrote: > Of course, by this you mean, with the same total number of nodes, for e.g. 64 > process on 1 node using shared mem, vs 64 processes spread over 2 nodes (32 > each for e.g.)? > > > On 29 October 2013 14:37, Ralph Castain <r...@open-mpi.org> wrote: > As someone previously noted, apps will always run slower on multiple nodes vs > everything on a single node due to the shared memory vs IB differences. > Nothing you can do about that one. > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
