[Bf-cycles] CPU Threads benchmarks

[Matthew Heimlich]

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
>
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>
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