[Bf-cycles] CPU Threads benchmarks

[Julian Herzog]

Hi,

I did these tests a while back and also found very small differences with
no clear winner. I think that an automatic setting that corresponds with
the number of virtual CPU-Threads would be the best then, as it is less
confusing.

Julian
On Jul 8, 2013 7:05 PM, "Greg Zaal" <gregzzmail at gmail.com> wrote:

> Interesting. I tested some scenes, both simple and heavy, on both windows
> and linux and noticed only tiny changes in render time (2 seconds for a 9
> min render, 0.3 seconds for a 1 minute render) - using 3.4GHz 8 core
> i7-2600k.
> Neither auto-threads or manually using 8 was consistently the winner
> either. In some scenes auto (9 tiles) was quicker, and others 8 tiles were
> quicker.
> With such small differences and inconsistent results, it seems more likely
> that it had little to do with the number of threads used and could probably
> have been caused by other background programs doing their thing.
>
> Greg
>
>
> On 8 July 2013 00:12, Matthew Heimlich <matt.heimlich at gmail.com> wrote:
>
>> I'll compile the times in a pdf when I get a chance, but on my i7 2600k @
>> 4.6GHz setting manually to 8 threads was faster for every test in the
>> cycles suite than using auto-detect.
>>
>> Matt Heimlich
>>
>>
>> On Sat, Jul 6, 2013 at 3:48 PM, Thomas Dinges <blender at dingto.org> wrote:
>>
>>> Hi,
>>> some time ago (summer 2012), we changed the amount of threads for CPU
>>> rendering to "number of threads + 1", when using the threads "Auto
>>> Detect" feature, which is default.
>>> This topic has been raised a couple of times since then, especially
>>> users were wondering why they have e.g. 5 tiles on screen, although they
>>> only have 4 CPU cores.
>>>
>>> I did some tests today, and it seems there is no real performance gain
>>> by doing "threads + 1". It would be good though to re-confirm this on 8
>>> thread systems too (Core i7, Hyper Threading).
>>>
>>> Here my benchmark results:
>>> http://archive.dingto.org/2013/blender/code/Cycles_Thread_Bench.pdf
>>>
>>> Best regards,
>>> Thomas
>>>
>>> --
>>> Thomas Dinges
>>> Blender Developer, Artist and Musician
>>>
>>> www.dingto.org
>>>
>>> _______________________________________________
>>> Bf-cycles mailing list
>>> Bf-cycles at blender.org
>>> http://lists.blender.org/mailman/listinfo/bf-cycles
>>>
>>
>>
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>>
>
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