[Bf-cycles] CUDA render speed with upcoming toolkit 4.1

Brecht Van Lommel brechtvanlommel at pandora.be
Sun Dec 11 21:06:48 CET 2011

They switched to a new LLVM based compiler backend, probably that's
the cause. Maybe it's a matter of tweaking flags, or maybe it needs
deeper changes or a bugfix on their end, needs to be investigated...


On Sun, Dec 11, 2011 at 7:45 PM, Thomas Dinges <blender at dingto.org> wrote:
> Hi,
> I tested the RC2 of the upcoming CUDA Toolkit 4.1.
> http://developer.nvidia.com/cuda-toolkit-41
> To my surprise, this affects render time a lot.
> A scene of mine with 18k vertices renders in 2:48 minutes, whereas it
> finished within 44 seconds, when compiled with the Toolkit 4.0.
> Same goes for the bmps.blend inside our test svn, much slower with the
> new toolkit.
> Nothing to worry about I guess, but I wanted to report this anyways, but
> hopefully it's just a bug in their RC2.
> Regards,
> Thomas
> --
> Thomas Dinges
> Blender Developer, Artist and Musician
> www.dingto.org
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