[Beowulf] InfiniBand channel bundling?

Prentice Bisbal prentice.bisbal at rutgers.edu
Wed Oct 29 09:04:47 PDT 2014

On 10/28/2014 04:43 PM, Mark Hahn wrote:
> 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.

Yes, it was known to me. I had already known that FDR was worse than QDR 
for latency, but I don't remember my source. I don't know if I'd 
characterize it as "so terrible", though.


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