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This parses the output of rocm-smi to generate GPU usage data for AMD, as for NVIDIA. It's a bit of a hack but is reliable in my testing - I have a machine with two NVIDIA cards, and some test code that uses both of them.
I think that our nervousness about running nvidia-smi (see #44) is going to be even more acute for rocm-smi.
(The base rev here is not the tip of my work queue but the underlying main refactoring of ps.rs, #45, a little rebasing work will be required to land this if all the other patches land first.)