Am 09.08.2010 15:08, schrieb Le_Forgeron:
> Le 09/08/2010 14:55, JJ a écrit :
>> Stephen<mca### [at] aolDOTcom>  wrote:
>> Hello,
>>
>> I tried 3.7 beta version, after serious problems with glass texture, media and
>> gamma, now I see that for several povray files the 3.7 SMP version is slower
>> than older 3.6 version (using only one core).

@Stephen: What OS and exact versions of POV-Ray are we talking about?


>> Did you saw something like this with the last POVRAY 3.7 SMP version.
>> With one povray file including glass texture, rendering time was 3 minutes using
>> 3.6 single core and 12 minutes using 3.7 SMP.

Such issues have already been reported a while ago with earlier POV-Ray 
3.7 betas, though mainly in conjunction with animations IIRC.

> I'm lazy, I do not want to search for a scene with glass texture.
>
> Can you name one for me from the distribution, so that I could test it ?
> (especially one that displayed your reported behaviour: quick on 3.6,
> slow on 3.7)
>
> Thanks in advance.
> (Ready to test with the latest beta, as soon as you name the scene file)

FYI: I'm currently running single-threaded (+WT1) beta.38 (inofficial 
64-bit binary compiled with Intel icpc 11.1) against a collection of 
~150 scenes on a Linux AMD64 machine (Phenom 9650 2.3GHz Quad-Core) to 
compare them with timing results for POV-Ray 3.6.1 (official 32-bit 
binary compiled with GNU g++ 3.4.1) and MegaPOV 1.2.1 (official 64-bit 
binary compiled with GNU g++, unknown compiler version).

If there's anything substantial about the single-thread timing issues, 
and those are /not/ OS- or compiler-dependant or specific to rare 
circumstances, then it should ring an alarm bell or two on my 
performance testbed.

So far, the tests have already highlighted a scene that renders in 8:35 
instead of 2:40 (MegaPOV), but that one uses radiosity, which has 
changed too much to be comparable.

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