[Bf-committers] Blender 2.43 RC1

Ton Roosendaal ton at blender.org
Tue Jan 9 12:49:28 CET 2007


Such a test is meaningless with code that wasn't made threadsafe for  
more than 2 threads. For example the clipping of geometry (per tile,  
per thread) only supported 2 threads, so rendering more threads will  
give big render errors.


On 9 Jan, 2007, at 9:08, Tom M wrote:

>> Here is, though it's just cosmetic.
>> 1) I noticed now it's possible to use more than 2 threads for  
>> rendering. Indeed
>> in the past I did a test with official 2.42a and with up to 16 CPU  
>> (see this:
>> http://people.mandriva.com/~ghibo/blender_scaling.png)
>> and the result was that beyond 8 processors blender rendering time
>> wasn't scaling anymore, so I guess your choice of limit to max 8  
>> threads per
>> blender sessions comes from this.
> How many tiles are you using for each test?  Tiles can impact ram
> consumption, they can also drastically impact how fast you complete -
> between double and triple the number of tiles compared to number of
> processors seemed to be best from a discussion on irc.  Also a 180
> second scene - it might be taking nearly all of the time for setup.
> Ask someone for a scene that takes a long time to render and the
> additional processors might be of benefit.
> LetterRip
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Ton Roosendaal  Blender Foundation ton at blender.org  

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