More specifically, Open MPI still uses a TCP layer for its run-time setup/teardown. That TCP can be regular ethernet, IPoIB, or any other emulation layer. Ralph's referring to the oob_tcp_if_in|exclude flags allows you to specify using your IPoIB devices, pure ethernet devices, etc.
On Apr 5, 2010, at 6:05 PM, Ralph Castain wrote:
> If it is available, yes - though you can control that by setting the oob_tcp_if_include[exclude] flags
> On Apr 5, 2010, at 3:44 PM, David Turner wrote:
> > Hi all,
> > Please, some clarification. I have built Open MPI 1.4.1 against
> > our IB verbs layer, and all seems well. But a question has come
> > up about IPoIB. While all communications are using the "native"
> > IB interface (verbs), will mpirun use IPoIB during job launch
> > and teardown?
> > If it matters, resource allocation is via torque.
> > Thanks!
> > --
> > Best regards,
> > David Turner
> > User Services Group email: dpturner_at_[hidden]
> > NERSC Division phone: (510) 486-4027
> > Lawrence Berkeley Lab fax: (510) 486-4316
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
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