[Beowulf] SCI Socket latency: 2.27 microseconds

Joachim Worringen joachim at ccrl-nece.de
Tue Mar 2 03:36:42 EST 2004


Mark Hahn:
> > "This is the lowest latency socket solution available today," said
> > Hugo Kohmann, CTO for Dolphin Interconnect. "SCI Socket opens new
>
> well, Quadrics now claims 1.8 us MPI latency:
> http://doc.quadrics.com/quadrics/QuadricsHome.nsf/NewsByDate/5D7D7444A42B39
>8280256E44005A31DD
>
> it's interesting that SCI is still on 64x66 PCI - it would be very
> interesting to know how many and what kinds of codes really require
[..]

A large fraction of the latency does indeed stem from the two PCI-buses that 
need to be crossed. For that reason, Dolphin would certainly get an 
additional latency decrease when running on a 133MHz bus. I guess they have 
this in the pipeline. 

 Joachim

-- 
Joachim Worringen - NEC C&C research lab St.Augustin
fon +49-2241-9252.20 - fax .99 - http://www.ccrl-nece.de

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