[Bf-committers] Blender 2.43 RC1

Giuseppe Ghibò ghibo at mandriva.com
Tue Jan 9 15:33:18 CET 2007


Ton Roosendaal ha scritto:

> Hi,
> 
> 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.

well, this means that 2 threads are safe, so initial value could
be taken as 2 if # CPU recognized is grater than 1. Where is the place of 
modifying the initial default value in the UI?

Bye
Giuseppe.

> 
> -Ton-
> 
> 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 http://www.blender.org
> 
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