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).

You are aware, of course, that some implementation have been changed ?

> Hardware processor is core I7 870.

Great, Could compare to mine then, if needed.

> 
> For core I7, the frequence is increased if you use only one core.
> 
> 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.

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)

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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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On 09/08/2010 4:08 PM, clipka wrote:
> 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?
>

Christoph, are you writing to me? Or there maybe a cut and paste type 
error in the headers. Anyway I’m running Win 7 (32 bit) with Beta 38. 
The benchmark is the one under Render > Run Benchmark (all CPUs) with 
lots of other progs running. It took 9m 27s. Using 
"C:\Users\Stephen\Documents\POV-Ray\v3.7\scenes\advanced\benchmark.ini" 
took 34m 16s which is longer than what I reported previously/

-- 

Best Regards,
	Stephen

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Am 09.08.2010 19:19, schrieb Stephen:
> On 09/08/2010 4:08 PM, clipka wrote:
>> 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?
>
> Christoph, are you writing to me? Or there maybe a cut and paste type

Oops, sorry. Should have been "@JJ:", as it turns out.

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On 09/08/2010 6:23 PM, clipka wrote:
> Am 09.08.2010 19:19, schrieb Stephen:

>> Christoph, are you writing to me? Or there maybe a cut and paste type
>
> Oops, sorry. Should have been "@JJ:", as it turns out.

That's what I thought :-P

-- 

Best Regards,
	Stephen

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Am 09.08.2010 17:08, schrieb clipka:

> 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.

I'm seeing notable slowdown for the following sample scenes (real 
run-time in seconds):

                 MegaPOV 1.2.1   3.7.0.beta.38 +WT1
chess2.pov      223             409
grenadine.pov   164		214
infinitybox.pov  16              34  (!!!)
wineglass.pov    40              58

(plus various scenes using radiosity, but I'm ignoring those here)

Except for the "chess2.pov" slowdown, the other three appear to have 
been newly introduced with beta.38, as a similar slowdown can also be 
observed between multi-thread beta.37a and beta.38 for these particular 
scenes.


OTOH, there is an even greater number of scenes exhibiting a notable 
(and in some cases astonishing) speedup, e.g.:

                         MegaPOV 1.2.1   3.7.0.beta.38 +WT1
glasschess.pov          499             281
landscape.pov           575              43  (!!!)
newdiffract.pov         574             129  (!!!)
projected_through.pov    36              13  (!!!)

(plus various scenes using radiosity, and others using crackle)

Again, some of these speedups can also be seen between multi-threaded 
beta.37a and beta.38.


 From this I draw the conclusion that the speed balance between 
individual features has indeed been changing, but the overall speed of 
POV-Ray has not degraded in that process.

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