Finally -- I think I have it working: https://svn.open-mpi.org/trac/ompi/ticket/1988#comment:5
Please, everyone, give coll sm as much testing as you can on as many different platforms as you can. Use "--mca coll_sm_priority 100" to activate it (and run >1 ppn, of course!).
Thanks! -- Jeff Squyres jsquy...@cisco.com