Improve macOS GPU monitoring and telemetry - #496
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Apple IOReport samples scale correctly from roughly 1.2 W at idle to more than 60 W under a controlled Metal load. However, integer milliwatt-to-watt conversion flattened the entire 1.0-1.9 W range to 1 W and made the telemetry appear stuck. Retain one decimal place when no power limit is available and in snapshot output so low-power variation remains visible.
Apple Silicon exposes its GPU thermal domain through undocumented lowercase Tg keys in AppleSMC rather than Metal. Discover that sorted key range with a binary lookup, cache valid float sensors, and report their average without scanning the full SMC table. Throttle sensor reads to once per second and fail closed when the private protocol, key ordering, types, or permissions differ.
Apple Silicon exposes current fan speeds through undocumented F?Ac AppleSMC keys. Discover and cache valid float sensors alongside the existing GPU temperature keys, throttle samples independently, and report the highest active system fan through nvtop's singular RPM field. Keep temperature and fan discovery independent so either metric remains available when the other key family is missing or changes. Prefer measured RPM over the integrated-GPU CPU-FAN placeholder, and reject malformed sensor samples.
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I can remove 629ab90 if you're not interested in mac CI. |
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Summary
The Apple-specific telemetry fails gracefully when private IOReport, IOKit, or SMC data is unavailable.
Testing