On Tue, Jan 15, 2008 at 09:49:40AM -0500, M Jones wrote:
> We have a mixed environment in which roughly 2/3 of the nodes
> in our cluster have myrinet (mx 1.2.1), while the full cluster has
> gigE. Running open-mpi exclusively on myrinet nodes or exclusively
> on non-myrinet nodes is fine, but mixing the two nodes types
> results in a runtime error (PML add procs failed), no matter what --mca
> flags I try to use to push the traffic onto tcp (note that
> --mca mtl ^mx --mca btl ^mx does appear to use tcp, as long as all
> of the nodes have myrinet cards, but not in the mixed case).
What error do you get in this case? What version of Open MPI are you using?