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

[Thomas Dinges]

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 
> <mailto: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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