[Bf-cycles] CUDA Toolkit 6.5 and Volume on GPU

[Martijn Berger]

Hi Thomas,

I think the move to cuda 6.5 and enabling volume are 2 issues and should be
treated as such. I do however agree that we should do both.
Ill update the buildbot to cuda 6.5. The cuda 6.5 cubins should work on
older drivers ( pre 331 ) but it would be good to also test and verify.

Best regards,
Martijn


On Fri, Aug 22, 2014 at 5:16 PM, Thomas Dinges <blender at dingto.org> wrote:

>  Hi David,
> thanks for the tests!
>
> * Equi-Angular and MIS is only implemented for Decoupled Ray Marching,
> which we cannot enable on GPU yet due to Performance / Stability issues. I
> will change the UI accordingly (for example disable the button when GPU is
> used).
>
> * The performance drop when using a texture is to be expected, Decoupled
> Ray Marching helps here quite a bit, I guess that's why CPU is faster in
> that case.
>
> Best regards,
> Thomas
>
> Am 22.08.2014 um 15:57 schrieb David Fenner:
>
> On GTX titan, mike pan test:
>
>  2.71 official                  27.62
> vainilla cuda 6.5          28.07
> volume cuda 6.5          28.25
>
>
>  Notes: Was testing volumes and with a simple world volume and a lamp now
> it's actually much faster than cpu (before gpu was crazy slow). Haven't
> tested it with more complex scenes.  I noticed though that in gpu volume
> gets always sampled as "distance" sampling, no matter the setting. Cpu
> however respects the other settings (equiangular, etc). In distance gpu
> much faster and its also faster when bounces are introduced, something that
> in older builds really killed gpu performance.
>
>
>
>
>
> 2014-08-22 8:48 GMT-04:00 Tungerz <tungerz at gmail.com>:
>
>>  Probably nothing,
>> I was upgrading my Cuda Toolkit to 6.5 (From 6.0)
>> My Norton antivirus picked up a virus from file nppc32_65.dll =
>> Suspicious.Cloud.7.F
>> Anyone else on windows had this?
>>
>>  Great results, looks like a small price to pay for gpu volume and
>> scatter.
>> Worth ever bit of it :)
>>
>>  Cheers,
>>  ~Tung
>>
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>
>
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