[Beowulf] 1.2 us IB latency?
cap at nsc.liu.se
Tue Mar 27 15:23:40 PDT 2007
On Tuesday 27 March 2007, Mark Hahn wrote:
> well, if the numbers mean what they appear to mean, this is quite
> a dramatic breakthrough: 1.2 us, 25M msg/s. since we just happend to
> be talking about "conventional" IB vs Infinipath (1.29 us, 11.3M msg/s).
> or is this an example of message aggregation? heck, from the url
> above, it might even be counting intra-box messages.
Nope, this is "normal" ping-pong for the new generation cards (connectx).
Maybe a bit optimistic though, I'd expect closer to 1.5 in a back-to-back
> also, I'm sorta amazed people keep selling (and presumably buying)
> dual-port IB cards. doesn't that get quite expensive, switch-wise?
Not defending them but, It could possibly maybe be useful if you have a
stand-alone IB net for, say, storage or something else not mpi. Also, it's
not like they're that much more expensive than single port ones...
> regards, mark hahn.
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