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

David Fenner d4vidfenner at gmail.com
Fri Aug 22 16:06:09 CEST 2014

Ok, done some further testing and the thing that really kills gpu
performance are textures in volumes. With no textures gtx Titan is about 3
times faster than a 6-core overclocked ivy bridge, even with volume scatter
and lots of bounces. However when textures are introduced, amazingly cpu
gets about 1.5 times faster than gpu. That means that texturing volumes
cripples gpu performance by about 4 times.  Still, non textured volumes are
actually flying on the gpu (even though its only distance sampling) and are
totally worth it for now.

2014-08-22 9:57 GMT-04:00 David Fenner <d4vidfenner at gmail.com>:

> 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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>> Bf-cycles at blender.org
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