[Bf-committers] Builders: please upgrade to CUDA 5.0

[Jürgen Herrmann]

Just a little update:
The bug report is out to NVidia and they could reproduce the issue.
It is filed as [CBS] 298362 and they are trying to find a solution.
Until then MSVC 2012 x86 builds without sm_35 kernels.

/Jürgen

Am 23.06.2013 um 20:18 schrieb Jürgen Herrmann <shadowrom at me.com>:

> Hi Brecht, 
> 
> When building cycles cuda kernels on VS2012 with cuda 5.5 ptxas.exe crashes
> on generating the sm_35.cubin.
> This happen on 32 bits only 64bits is fine.
> I found out that the --maxrregcount=32 option is the problem here, changing
> this to any other value makes it work fine (even 31 works, but as I read the
> documentation it says that the value is rounded to the next multiple of 4
> O_o).
> 
> This helped to work around this issue on my system:
> 
> Index: intern/cycles/kernel/CMakeLists.txt
> ===================================================================
> --- intern/cycles/kernel/CMakeLists.txt    (revision 57664)
> +++ intern/cycles/kernel/CMakeLists.txt    (working copy)
> @@ -170,7 +170,12 @@
>                set(cuda_arch_flags "--maxrregcount=32")
>            else()
>                # sm_3x
> -                set(cuda_arch_flags "--maxrregcount=32")
> +                # Workaround for Cuda 5.5 crashes with VC
> 2012 32-bits let the compiler determine maxrregcount itself
> +                if(CUDA_VERSION GREATER 50 AND ${arch}
> MATCHES "sm_35" AND MSVC11 AND CUDA_BITS MATCHES "32")
> +                    set(cuda_arch_flags
> "--maxrregcount=0")
> +                else()
> +                    set(cuda_arch_flags
> "--maxrregcount=32")
> +                endif()
>            endif()
> 
>            set(cuda_math_flags "--use_fast_math")
> 
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: bf-committers-bounces at blender.org
> [mailto:bf-committers-bounces at blender.org] Im Auftrag von Brecht Van Lommel
> Gesendet: Freitag, 21. Juni 2013 12:15
> An: bf-blender developers
> Betreff: Re: [Bf-committers] Builders: please upgrade to CUDA 5.0
> 
> See the blenderartists threads starting from here:
> http://www.blenderartists.org/forum/showthread.php?216113-Brecht-s-easter-eg
> g-surprise-Modernizing-shading-and-rendering&p=2404699&viewfull=1#post240469
> 9
> 
> On Fri, Jun 21, 2013 at 11:26 AM, Knapp <magick.crow at gmail.com> wrote:
>>> * Significant Cycles speedups for some scenes and graphics cards
>> 
>> Which?
>> 
>> 
>> 
>> --
>> Douglas E Knapp
>> 
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