[Beowulf] Infiniband modular switches

[Gilad Shainer]

Dan Kidger wrote:
 
> Gilad wrote:
> > It was proven by the same person who did the slides you 
> referred to, 
> > when doing the same testing on IB DDR we got much better 
> results with 
> > IB versus Quadrics. your theory does not really meet reality.
> 
> Care to describe to the list what these results were, and to 
> speculate about why IB gave better results?
> 
> Daniel
> 

Sure. My intend was not to compare between IB and Quadrics, but to show
that the network/host injection rate is very relevant in contention
tests. For given host injection rate, increase in network capability
reduces the contention (assuming finite number of hosts.....). As for
the numbers:

Send ave: IB SDR 263MB, Quadrics 369MB, IB DDR 453MB
Receive ave: IB SDR 340MB, Quadrics 370MB, IB DDR 547MB

I noticed that Quadrics decided to use just part of those numbers for
their poster at ISC ...  ;-)

Gilad.