clipka escreveu:
> Something *REALLY* weird is going on with the beta.30-rad1. Look at these
> performance measurements (done with Linux "time" command - I find the builtin
> timing stats a bit off). The scene was the "rad-def-test.pov" sample scene,
> modified to use the "2Bounce" settings from "rad_def.inc".
> 
> Timings are in seconds; "real" is wall clock time; "user" and "sys" is CPU time
> spent in user and kernel mode, respectively; version used was actually not
> exactly beta.30-rad1 but a slightly modified one, but I guess we see the same
> effect:
> 
> 
> beta.29 on 4 cores (just for reference):
> 
> real 7.00
> user 25.71
> sys 0.03
> 
> 
> beta.30-rad1 on 4 cores:
> 
> real 53.99
> user 195.49
> sys 0.11
> 
> 
> beta.30-rad1 throttled to use 1 core only:
> 
> real 292.78
> user 292.48
> sys 0.03
> 
> 
> Uh - so running on 4 cores, the beta.30-rad1 is not just faster, but actually
> MORE EFFICIENT than running on a single core...?!? I guess that would qualify
> for a nobel prize in informatics (if there was such a thing)...

Forgive my stupid ignorance, but shouldn't it be expected that usage of 
more cores to handle more threads separately and truly running in 
parallel would lead naturally to such boost in performance?  Isn't that 
what all this multicore hype is all about?

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