[Beowulf] InfiniBand channel bundling?

[Mark Hahn]

On Tue, 28 Oct 2014, John Hearns wrote:
> Here is a very good post from Glenn Lockwood regarding FDR versus dual-rail QDR:
>
> http://glennklockwood.blogspot.co.uk/2013/05/fdr-infiniband-vs-dual-rail-qdr.html

indeed, very nice.  though also quite surprising - is it known that 
FDR is so terrible for latency?  seems astonishing to me.

has anyone seen a good (broad, modern) study of the distribution
of MPI traffic?  (packet sizes as well as whether awaited writes 
are eager, etc)

regards, mark hahn.