scott nous apporta ses lumieres en ce 2007/12/05 02:58:
>>>> I tested with the latest beta, and it takes almost exactly 5 minutes 
>>>> on my laptop (dual-core 2 GHz).  Under 1 minute for a newer 4-core 
>>>> 3.2 GHz machine seems in the right ball-park.
>>>
>>> Hmm, I have a Pentium 2.66 GHz quad core here, and the standard 
>>> benchmark took 4 minutes, 20 seconds! Why would this be only slightly 
>>> faster that a 2 GHz duo-core machine?
>>
>> Okay, I just tested it with 3.7-SSE2, and the render time was 3m 06s.
> 
> Yeh, I used the SSE2 version, but I would have expected 4x 2.66 GHz to 
> be more than twice the speed of 2x 2.00 GHz...
> 
> It's an Intel Core2Duo T7200 btw.
> 
> 
You have a bottle neck: Memory access. You also have some added overhead of 
syncronizing the 4 cores.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you're starting to find these 
quotes more unsettling than funny.
     -- Alex McLeod a.k.a. Giant Robot Messiah

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