Re: Automatic parallelization - was Re: LISP Object Oriented?

On Wed, 31 Jan 2007 17:13:26 +0100, Rob Warnock <rpw3@xxxxxxxx> wrote:


And even poorer use of all that extra leakage current
[excess heat, a.k.a. wasted electricity]. As the cores get
smaller & smaller, the idle power becomes a larger and larger
fraction of the full-out running power. So fewer cores used
more efficiently means more computations/kW-hr than many
cores used less efficiently, even if the computations/hr
happens to be the same.


The Intel 940 quad core is actually more energy efficient than the
800 series. Partly the 65nm technology uses less energy than the 90nm.
Partly better power management. It shuts down parts of the processor that
are not in use.

Far worse are todays high end GPU's.
A dual 8800 NVIDEA GPU uses 4 PCI power connections, uses about 1KW of
power and produces heat like a toaster. You need a CPU fan two GPU fans, a fan to pull
the air in, another to push it out and a third to push it past the GPU's.
Not exactly quiet then. More like having a fridge in you office except that
it runs all the time..

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