add support for setting sm count in nvcuda backend#384
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Very experimental, but the idea is to be able to tune the active SM percentage in combination with other parameters. This can be controlled in CUDA using "Green Contexts". It is relatively involved to setup, so I have only implemented it in the cuda-python backend as of now.
The idea is that this parameter is interesting for energy efficiency tuning. In particular bandwidth bound kernels may disable some SMs to reduce energy use of cores that are idling most of the time anyway.
We could extend it to other CUDA backends as well probably.