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Estimate fan duty from observed RPM maxima

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This commit is contained in:
Mikhail Chusavitin
2026-04-16 10:10:18 +03:00
parent e306250da7
commit 18e24a9aa5
5 changed files with 273 additions and 53 deletions
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17
audit/internal/platform/benchmark.go
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@@ -1122,6 +1122,7 @@ type benchmarkCoolingSample struct {
AvgFanRPM float64
AvgFanDutyCyclePct float64
FanDutyCycleAvailable bool
FanDutyCycleEstimated bool
}
func sampleBenchmarkTelemetry(gpuIndices []int) ([]GPUMetricRow, error) {
@@ -1134,6 +1135,7 @@ func sampleBenchmarkTelemetry(gpuIndices []int) ([]GPUMetricRow, error) {
samples[i].FanAvgRPM = fanSample.AvgFanRPM
samples[i].FanDutyCyclePct = fanSample.AvgFanDutyCyclePct
samples[i].FanDutyCycleAvailable = fanSample.FanDutyCycleAvailable
samples[i].FanDutyCycleEstimated = fanSample.FanDutyCycleEstimated
}
return samples, nil
}
@@ -1141,11 +1143,12 @@ func sampleBenchmarkTelemetry(gpuIndices []int) ([]GPUMetricRow, error) {
func sampleBenchmarkCoolingSample() benchmarkCoolingSample {
fans, _ := sampleFanSpeeds()
avgRPM, _, _ := fanRPMStats(fans)
dutyPct, dutyAvailable := sampleFanDutyCyclePct()
dutyPct, dutyAvailable, dutyEstimated := sampleFanDutyCyclePctFromFans(fans)
return benchmarkCoolingSample{
AvgFanRPM: avgRPM,
AvgFanDutyCyclePct: dutyPct,
FanDutyCycleAvailable: dutyAvailable,
FanDutyCycleEstimated: dutyEstimated,
}
}
@@ -1387,25 +1390,33 @@ func summarizeBenchmarkCooling(rows []GPUMetricRow) *BenchmarkCoolingSummary {
}
var rpmValues []float64
var dutyValues []float64
var dutyEstimated bool
for _, row := range rows {
if row.FanAvgRPM > 0 {
rpmValues = append(rpmValues, row.FanAvgRPM)
}
if row.FanDutyCycleAvailable {
dutyValues = append(dutyValues, row.FanDutyCyclePct)
if row.FanDutyCycleEstimated {
dutyEstimated = true
}
}
}
if len(rpmValues) == 0 && len(dutyValues) == 0 {
return nil
}
summary := &BenchmarkCoolingSummary{
Available: true,
AvgFanRPM: benchmarkMean(rpmValues),
Available: true,
AvgFanRPM: benchmarkMean(rpmValues),
FanDutyCycleEstimated: dutyEstimated,
}
if len(dutyValues) > 0 {
summary.FanDutyCycleAvailable = true
summary.AvgFanDutyCyclePct = benchmarkMean(dutyValues)
summary.P95FanDutyCyclePct = benchmarkPercentile(dutyValues, 95)
if summary.FanDutyCycleEstimated {
summary.Notes = append(summary.Notes, "fan duty cycle is estimated from the highest fan RPM observed since boot; treat it as an approximation, not a direct PWM reading")
}
} else {
summary.Notes = append(summary.Notes, "fan duty cycle unavailable on this host; RPM-only fan telemetry was collected")
}