Pitched pointers

[samuelpowell]

Further to discussion about porting CUFFT.jl to use CUDAdrv (JuliaAttic/CUFFT.jl#12), it would be useful to provide support for CUDA pitched pointers, in addition to standard memory types.

How might such an implementation be best approached, given longer term plans for this package (e.g., is there still a plan to move to the CuArray implementation?).

[maleadt]

cuMemAllocPitched is not currently wrapped indeed, and would probably need to be implemented as a method of alloc in the following: https://github.com/JuliaGPU/CUDAdrv.jl/blob/a8b2e3ca93a3a2be5b525f3bdf09425363b823c9/src/memory.jl#L145-L163

is there still a plan to move to the CuArray implementation?

Yes, I'm gradually moving towards deprecating CUDAdrv.CuArray, but am waiting for 0.7/1.0 to be supported by GPUArrays/CuArrays. In that world, using these new alloc methods would be a responsibility of an array type like CuArrays.jl, taking into account the overhead trade offs and effective pitch to index correctly.

[samuelpowell]

Thanks Tim, that makes sense. I'll keep my eye on changes and attempt a PR when time permits.