State of Cycles GPU Rendering

[Anti-Distinctlyminty]

Hi,
I am eagerly looking into using Gaffer in our productions so have been playing around with it. One thing that I have noticed is that the Cycles rendering is very slow compared to the same scene in Blender. In the CyclesOptions node I have specified CUDA:* in the Device(s) field, but it seems to be that the GPU is not being used at all. I have searched extensively on this topic but found nothing.

Is Cycles GPU rendering functional?

[Animatect]

As far as I know it is, but you have to build Cycles with GPU support and Gaffer with that Cycles, @boberfly comitted some changes as to just reference cycles with a Variable like you can do with Arnold and not to have to build Gaffer but I don't know if that was already reviewed at Blender foundation or integrated.

The reason for doing it this way has to do as far as I know with problems with NVIDIA licensing to automate the build process.

[Anti-Distinctlyminty]

The readme seems somewhat vague, but as the most recent discussion I can find here states

Right now Cycles will only use the GPU [sic] (on Windows and Linux) while we get it nice and stable.

I'm pretty sure that's a typo and Eric meant CPU. So I'll either compile or wait, but it's on the roadmap. Thanks @Animatect.