CUDA Grid, Block, Threads

[luraess]

https://github.com/pohlan/SheetModel.jl/blob/14681a90aa6b23a5b83a3ba8c0d4064319948321/src/helpers.jl#L26

@pohlan Here you may find some material about the CUDA threads organisation and programming model:

• https://en.wikipedia.org/wiki/Thread_block_(CUDA_programming)
• https://developer.nvidia.com/blog/cuda-refresher-cuda-programming-model/
• https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#introduction (until 2.4 included)