[OMPI users] MPI_Barrier hangs on second attempt but only when multiple hosts used.

I have been using MPI for many many years so I have very well debugged mpi tests. I am having trouble on either openmpi-1.4.5 or openmpi-1.6.5 versions though with getting the MPI_Barrier calls to work. It works fine when I run all processes on one machine but when I run with two or more host

Re: [OMPI users] Mapping ranks to hosts (from MPI error messages)

Just to close the loop on this: I added the binding info to --display-map On Mar 28, 2014, at 6:58 AM, Jeff Squyres (jsquyres) wrote: > Good information; thanks. > > The short reason for this change in behavior of the affinity options is that > when we first created affinity (wy back in 1