Add (optional) GPU usage stats?

[thw0rted]

I'd like to know GPU usage for a given process, ideally as a percentage similar to CPU. In Windows, this is possible by accessing the "Utilization Percentage" Performance Counter, though I'm not sure how to do that with wmic rather than PowerShell. On *nix, it looks like there are proprietary commands for each vendor (ugh).

I assume that including this information would significantly increase the time required to return results so it would probably be better behind a flag in the options-object. It also sounds like it would be pretty complex to implement, given the lack of standardized tooling. Still, it'd be nice to have.