[Bf-cycles] Enabling hair rendering on GPU?

[Tobias Oelgarte]

I have an i5-2500K CPU @ 3.30GHz (4 cores) and an Nvidia GTX 560 TI. The 
GPU is usually a lot faster as the CPU while rendering. In simple scenes 
up to 20 times faster, in more complex scenes about 5 times faster. With 
a lot of hair it was at least 3 times faster then the CPU. I used 
optimal tiles sizes for both (24x24 for CPU and 256x256 for GPU, my 
usual optimum).

Am 16.02.2013 18:50, schrieb Matthew Heimlich:
> What are your GPU/CPU? Everyone else who tested it found CPU to be
> substantially faster than GPU.
>
> On Sat, Feb 16, 2013 at 12:37 PM, Tobias Oelgarte
> <tobias.oelgarte at googlemail.com> wrote:
>> For me it was still faster to render with GPU and the mentioned slowdown
>> as to render only with CPU. That means: Even if it makes Cycles slower
>> on the GPU it is still quite a bit faster as to render on CPU. I would
>> really like to have the option (maybe an own build option) to enable GPU
>> hair rendering, even if i have to consider the slowdown.
>>
>> Am 16.02.2013 18:20, schrieb Brecht Van Lommel:
>>> The problem at the moment is that it slows down GPU rendering
>>> significantly even when there is no hair in the scene, due to the
>>> extra complexity of the kernel. So that would need to be solved before
>>> it can be enabled.
>>>
>>> On Sat, Feb 16, 2013 at 5:19 PM, Tobias Oelgarte
>>> <tobias.oelgarte at googlemail.com> wrote:
>>>> Hello,
>>>>
>>>> i was using an older build with the first patches of the hair rendering
>>>> feature together with my GPU. But currently it is only available for
>>>> CPU, despite the fact that it was working just fine. Could we (re)enable
>>>> the hair rendering again for the GPU inside the experimental feature
>>>> set? I would really like to test it out, even if it would be unstable.
>>>> It would also help to file bug reports to make it work, if it not
>>>> already does.
>>>>
>>>> Greetings from
>>>> Tobias Oelgarte
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