[Gllug] Re: Super Computing Time

[John Hearns]

dennis furey wrote:

>A clock frequency of 560 GHz implies a period of 1.78E-12 seconds,
>during which a clock signal propagating at the speed of light (2.998E8
>m/s) covers about half a millimeter. Anyone who can squeeze all that
>gear into a space smaller than that might be a pretty good physicist
>already. ;)
>
Oh, and that's why Crays were built in a circular, or part-circular shape.
(And with a very nice seat built in. Pity PC makers don't put nice comfy
seats on top :-)
Sigh. Real computers. Sigh.


http://www.faqs.org/faqs/computer/system/cray/faq/




And also the big new Compaq cluster at Pittsburgh Supercomputer Centre
is crammed into nine racks as close together as possible.
Longest interconnect is 33feet.







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