[Bf-cycles] CPU Threads benchmarks

[Thomas Dinges]

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