On 09/27/2011 05:30 PM, Jeff Squyres wrote: > On Sep 27, 2011, at 5:03 PM, Prentice Bisbal wrote: > >> To clarify, is IP/Ethernet required, or will IPoIB be used if it's >> configured on the nodes? Would this make a difference. > > IPoIB is fine, although I've heard concerns about its stability at scale. > > The difference that it'll make is that it's generally faster than ethernet. > It never runs at wire IB speed because of the overheads involved, but it's > likely to be much faster than 1GB ethernet, for example. > > You can specify which interfaces Open MPI's OOB channel uses with the > oob_tcp_if_include MCA parameter. For example: > > mpirun --mca oob_tcp_if_include ib0 ... >
Jeff, Thanks for the clarification. I was just checking. Earlier in this thread you specifically said "ethernet". I suspected you meant "IP", and just wanted to be sure.
