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Fix CPU telemetry temperature/clock speed on Windows and macOS

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sample_cpu_temperature() only ever had a Linux implementation, so
Windows and macOS runs recorded empty temperature data points for
every sample. sample_cpu_clock_mhz() on both platforms read a static
nominal frequency once (Windows: the ~MHz registry value; macOS: the
hw.cpufrequency sysctl) instead of a live reading, so clock speed
showed as a constant throughout the benchmark.

Windows: temperature now queries the ACPI thermal zone over WMI
(MSAcpi_ThermalZoneTemperature), and clock speed reads live per-core
frequency via CallNtPowerInformation(ProcessorInformation). Both are
XP-compatible (verified via mingw cross-compile with the existing
windows-i386 XP toolchain/PE checks).

macOS: temperature reads the SMC directly (AppleSMC user client),
checking known CPU sensor keys across Intel and Apple Silicon
(M1-M5). There is no live-frequency API on macOS at all (Apple
Silicon has none, and hw.cpufrequency was always a fixed nominal
value even on Intel), so clock speed now reports as unavailable
instead of a misleading constant.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PcL8rcwwBeD6W3fZFCRLss
This commit is contained in:
owen
2026-07-21 01:13:33 -05:00
co-authored by Claude Sonnet 5
parent dcc77408c0
commit ec7e75e105
3 changed files with 250 additions and 15 deletions
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.github/workflows/release.yml
+1 -1
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@@ -175,5 +175,5 @@ jobs:
release/SHA256SUMS \
--repo "$GITHUB_REPOSITORY" \
--title "Release $RELEASE_TAG" \
--notes "Fixed x86/Linux builds on systems without OpenSSL development headers. Result uploads now use plain HTTP on every platform, removing the OpenSSL build and runtime dependency." \
--notes "Hotfix: CPU telemetry (temperature and clock speed) recorded during benchmark runs was not working on Windows or macOS, showing empty temperature data points and a constant clock speed. Windows temperature now reads the ACPI thermal zone over WMI, and clock speed reads live per-core frequency via CallNtPowerInformation instead of a static registry value. macOS temperature now reads the SMC directly across Intel and Apple Silicon (M1-M5) Macs. macOS clock speed now reports as unavailable rather than the fixed nominal frequency it previously showed, since no live-frequency API exists on macOS." \
--generate-notes