[Bf-cycles] CUDA and OpenCL procedure for 2.63

David Black db4tech at yahoo.co.uk
Thu Apr 5 14:24:12 CEST 2012

Hi Thomas,

I know your mail is meant for Brecht so hope you won't mind my little 
bit of information.

While researching instancing I tried the "19 Billions of Polygons, not a 
ridiculous number anymore" compared your recent CUDA 4.2 test build 
designed for GTX 680, compared a recent build from GraphicAll.org 
containing CUDA 4.0.

With the CUDA 4.2 build I get some graphical glitches compared to CUDA 
4.0, please see attached cropped images, this might be because I am 
using a GTX 460 but thought best to let you know in case it's caused by 
CUDA 4.2.

Thank you,



On 05/04/2012 11:04, Thomas Dinges wrote:
> Hi Brecht,
> for the upcoming 2.63 release I propose the following actions:
> The toolkit 4.2 is still in RC phase. Although I don't have any issues
> or slowdown here (Geforce 540), I'd stick to 4.0 toolkit for now.
> So I propose to build the sm_13, sm_20 and sm_21 kernels with toolkit 4.0
> and the sm_30 with the toolkit 4.2 for the Kepler gpus.
> I am not sure if the kernels are different for Linux or Windows, if they
> aren't I can build the Kepler kernels, upload, so release builders can
> manually copy the sm_30 kernel into addons/cycles/lib.
> Otherwise I will create the sm_30 kernels for windows only and upload
> for jesterKing.
> OpenCL:
> As it has been confirmed by several people in the forums, I think it's
> ok to enable _KERNEL_SHADING_ for OpenCL on AMD cards.
> There are some reports about not working textures, so we could enable it
> without textures support for now.
> But I think it's good to have this tested by a wider audience, rather
> than asking people to modify on their own builds.
> Should be pretty save, OpenCL is marked as Experimental feature in
> Cycles anyways.
> Best regards,
> Thomas
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