[Beowulf] /. Cooler room or cooler servers?
hahn at physics.mcmaster.ca
Thu Apr 7 17:14:37 PDT 2005
> > > One also needs to look at important ancillary issues like power
> > consumption
> > > of the cache, bus drivers, etc. And, of course, instruction stream
> > makes a
> > > big difference.
> >kind of obvious, don't you think? when I said peak, I meant peak,
> >and I'm quoting power dissipation measured at the wall plug (kill-a-watt).
> >for these systems, running two compute-intensive programs maxes out;
> >messing with memory or disks only adds a few watts (percent).
> My point was that the "Superior Power Efficiency" kind of chart (no matter
> where the numbers come from) is really meaningless. Simply knowing the
> basic technology level will tell you how many Joules/calculation you'll get
> to a first order. Any finer refinement will be very, very implementation
> and algorithm dependent.
I guess it's hard to argue with a "to a first order" statement.
but right now, AMD and Intel high-end chips are pretty comparable
in almost any performance metric, but AMD is noticably cooler.
this is not meaningless.
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