feat(metrics): report GPU utilisation on macOS - #258
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October 5, 2026 20:20
Read the I/O Kit accelerator through ioreg for utilisation and name. Memory and temperature are absent on macOS, so the renderers omit them rather than drawing zeros.
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Reports GPU utilisation and name on macOS hosts, so a local node's metrics, dashboard and gauges show a GPU figure as NVIDIA hosts already do. Closes #217.
Summary
ioregand reports device utilisation and the GPU's model name; a host with no accelerator stays silent, and a failingioregis reported as agpu:error.GPU memseries for a GPU that never reports a total, and the table format omits themem=andtemp=segments rather than printing zeros.macos-gpu-utilisationopenspec change (deltas toengine-metricsandremote-metrics-bar-format), which still needs archiving.Implementation details
ioregwas chosen overpowermetrics(needs root) and IOKit via cgo (would break the pure-Go package and cross-compiling). The Intel/AMD spelling of the utilisation key is parsed too, but only the Apple Silicon output was checked on a real host.