[Beowulf] InfiniBand channel bundling?

Christopher Samuel samuel at unimelb.edu.au
Mon Oct 27 15:21:37 PDT 2014

On 28/10/14 07:52, Prentice Bisbal wrote:

> You could increase the bandwidth, but not the latency. If anything, the
> latency might go up as some additional work will need to be done to
> coordinate the data going over the two different connections.

I suspect you'd take more of a penalty when doing the IB fabric
initialisation and then at wire-up of connections, once that's done it's
probably just a quick decision to decide which port to use for data
transfers.  So yes, maybe slightly slower (assuming the code has some
fast path that is used when there is only a single connection to use)
but I'd have thought likely not significant.

 Christopher Samuel        Senior Systems Administrator
 VLSCI - Victorian Life Sciences Computation Initiative
 Email: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545
 http://www.vlsci.org.au/      http://twitter.com/vlsci

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