At 11:17 AM 8/28/2007, Peter St. John wrote:
Greg,
Well that's fair of course, I should have said that 5GHz is an
unachiveable upper bound for a sufficiently distributable
application. If I wanted to add some huge number of integers, which
can be generated by some simple formula in ranges at each node, then
10 500MHz machines generating ranges and then computing subtotals
would be almost as fast as one 5GHz machine, but for any real apps
we would not see such a gain. I'm sure I"m overoptimistic about the
"embarassing parallelism" of my own app, but pretty much it's pretty
embarassing I'm pretty sure :-) Got's to see.
Peter
And, of course, if you just want to get your picture taken for the
local newspaper draping your arm over a supercomputer that you built,
it's more than sufficient. "local eccentric builds supercomputer in kitchen"
(or, if you have a suitable young child available... "9 year old builds....")
My wife considers this much more acceptable than, say, making a
neutron source by building a fusor (http://www.fusor.net), smelting
ore and making your own steel
(http://www.lindsaybks.com/bks9/fmetal/index.html), high powered
rocketry, or HV experimentation (http://www.pupman.com/). All these
other highly interesting activities create fears of her coming home
from work and finding the street blocked off with guys in bunny suits
carrying things out of our garage.
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875
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