I was just bitten yesterday by a problem that I've known about for a
> while but had never gotten around to looking into (I could have sworn
> that there was an open trac ticket on this, but I can't find one
> I have 2 hosts: one with 3 active ports and one with 2 active ports.
> If I run an MPI job between them, the openib BTL wireup got badly and
> it aborts. So handling a heterogeneous number of ports is not
> currently handled properly in the code.
> I don't know if Gleb's patch addresses this situation or not; I'll
> look at his patch this afternoon.
There is a ticket (closed) here:
It was fixed by Galen for 1.2. There is a FAQ entry also about this