On 09/27/2011 07:50 AM, Jeff Squyres wrote: > On Sep 27, 2011, at 6:35 AM, Salvatore Podda wrote: > >> We would like to know if the ethernet interfaces play any role in the >> startup phase of an opempi job using InfiniBand >> In this case, where we can found some literature on this topic? > > Unfortunately, there's not a lot of docs about this other than people asking > questions on this list. > > IP is used by default during Open MPI startup. Specifically, it is used as > our "out of band" communication channel for things like stdin/stdout/stderr > redirection, launch command relaying, process control, etc. The OOB channel > is also used by default for bootstrapping IB queue pairs.
To clarify, is IP/Ethernet required, or will IPoIB be used if it's configured on the nodes? Would this make a difference. Just curious, Prentice
