[Bf-cycles] CUDA performance tests

Daniel Salazar - patazstudio.com zanqdo at gmail.com
Mon May 19 21:43:44 CEST 2014

I wanna say thank you David for your dedication and your time. I know
how time consuming it is to do this research :) bye bye!
Daniel Salazar

On Mon, May 19, 2014 at 11:40 AM, Brecht Van Lommel
<brechtvanlommel at pandora.be> wrote:
> Thanks for the extra information, very helpful.
> On Sun, May 18, 2014 at 10:55 PM, David Black <db4tech at yahoo.co.uk> wrote:
>> Conclusion with my heavy scene:
>> Windows 7 x64, GTX 580m 2GB.
>> With Blender 2.70a total memory used 1540, since recent Blender versions use
>> more memory (1743) for the same scene there is limited space left for render
>> kernel. Removing just one of my high resolution textures also works, then
>> total memory used is 1688, it would seem the kernel needs at least 300MB
>> spare for full performance? Less than that and performance is severely
>> affected, two minute render becomes a ten minute render, could a 'Low memory
>> - renders will possibly be slower' warning be displayed in the render
>> header?
> Maybe, but I'm not sure if we have a good way to estimate when
> performance will be affected and when not. I'll look into this memory
> usage problem further this week.
>> Can't find a reason for memory usage increase however so supplied test
>> .blend (below).
>> Also noticed. Is it by design that F12 render preview now only updates Power
>> of 2 -1 for each consecutive update? This is okay for low sample amounts but
>> for renders with a few thousand samples as the render progresses it appears
>> nothing is happening or Cycles has frozen and may prompt a user to cancel
>> the render.
> It's not really by design, but due to the async changes that were done
> to avoid a lot of CPU usage. These have now been reverted for the 2.71
> release, so that update problem should be gone as well.
> Thanks,
> Brecht.
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