"Chambers" <ben### [at] pacificwebguycom> wrote in message 
news:147C633062104D78B2FA2555A7C26198@HomePC...
>> -----Original Message-----
>> For at least one of my own files (actually a pov with collection of
>> .inc's)
>> the render-time differences can be incredible, at the same output
> image
>> resolution just over 12 minutes using 1 thread in pvengine-sse2.exe,
>> and
>> about 96 minutes using 2 threads in pvengine32-sse2.exe (pvengine-
>> sse2.exe
>> beta 30 was 6 minutes faster, or 90 minutes, for whatever reason).
>
> Is there any way you could create a minimal scene that demonstrates this
> discrepancy?  I'm rather interested in testing it myself, as I haven't
> had any such problems.
>
> If you can't minimize the scene, would you consider posting your file,
> or a link to it?  I can't guarantee how useful it would be without
> knowing how large it is, of course.


Hey Ben, thanks for wanting to check on this but I haven't been able to get 
anywhere with it yet.
Something I misspoke of before was saying "splines" when I meant 
sphere_sweep (using cubic_spline).

I tried a separate test scene file with some objects (sor, blob, 
sphere_sweep, text, sphere, cylinder) taken from the original problem 
file(s), always renders with a speed-up using 2 threads. I can't seem to 
narrow it down to anything but the original render slows considerably at 1/4 
to 1/3 into it then remains slow, while the Work_Threads=1 helps it speed 
along by comparison.

I still haven't found another file able to cause the same kind of slowdown 
so it could be this one particular rendering I kept thinking of as being the 
problem when changing thread count, except if one does it I'm sure others 
must.

I ran a histogram in 3.6 to see what things would be using the most time 
(not able to in 3.7 beta?), sphere_sweep and overlapping cylinders with 
gradient pigment (some transparency) look the slowest. Not totally 
unexpected at all.

Vista search indexing was all I could think of outside of POV being at 
fault. I switched that off and nothing changed.

If I don't get anywhere soon I might email a link, if you wouldn't mind 
that. It's a time-line data chart I don't really want out loose on the 'net 
because of info used in it that would become outdated. But maybe it doesn't 
matter... guess I just can't see posting it due to the specific nature of 
it.

Bob

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