Tesla GPU not showing up for cudaDeviceCount/getDevice

I spent a few hours today debugging this — GPU programming is its own special form of hell. It turns out I had to disable ECC and reset the GPU:

nvidia-smi -i 1 -e 0
nvidia-smi -i 1 -r

Naturally, there was no indication of an ECC error having occurred, and just resetting the GPU’s doesn’t help matters.

Sigh.

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