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Warp wrote:
> The speed of Crays don't come from CPU speed, but from havint a *lot*
> of them (as well as fast memory buses, etc).
>
> POV-Ray versions previous to 3.7 do not benefit from a Cray at all.
> You get better speed by buying an old PC for $50.
>
> Now, POV-Ray 3.7 is a completely different story.
According to Wikipedia, the Cray-1 does an average of about 136 MFLOPS,
but can peak up to 250 MFLOPS if the code is structured right.
I think in general most "supercomputers" only achieve peak performance
for very specific kinds of workload. Just grabbing the POV-Ray source
code and throwing it at a C compiler is *highly* unlikely to just happen
to produce the right kind of workload.
(As you say, both Cray-1 and Cray-2 work because they're very parallel -
they're vector-processing machines. POV-Ray isn't structured that way.
It could be, but it isn't at present.)
--
http://blog.orphi.me.uk/
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