[Beowulf] InfiniBand channel bundling?

[Kilian Cavalotti]

Hi Jörg,

On Mon, Oct 27, 2014 at 3:56 AM, Jörg Saßmannshausen
<j.sassmannshausen at ucl.ac.uk> wrote:
> I got some older dual Mellanox Technologies MT23108 cards (8.5 Gb/sec (4X))
> and currently I am only using one of the two ports on them.
> I was wondering, is it possible with InfiniBand to utilise the second port in
> such a way that I can increase the bandwith of the network (and lower the
> latency maybe)?

Last time I checked, the Linux bonding driver didn't allow to bond IB
interfaces to increase throughput. I'd be happy to hear that this
changed, but I think only redundancy modes (such as active-backup)
were possible.

Now, Open MPI can take advantage of multiple, independent ports
connected to the same fabric: see
http://www.open-mpi.org/faq/?category=openfabrics#ofa-port-wireup for
details.

Cheers,
-- 
Kilian