150 lines
3.6 KiB
Rust
150 lines
3.6 KiB
Rust
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
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pub struct PowerSample {
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pub watts: f64,
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pub timestamp_us: u64,
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}
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#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
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pub struct EnergyResult {
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pub total_joules: f64,
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pub mean_watts: f64,
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pub peak_watts: f64,
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pub duration_s: f64,
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pub samples: usize,
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}
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/// Trait for reading instantaneous power (NVML, RAPL, etc.).
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pub trait PowerSource {
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fn read_watts(&self) -> f64;
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}
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/// Fixed-wattage mock for deterministic tests.
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pub struct MockPowerSource {
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pub watts: f64,
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}
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impl PowerSource for MockPowerSource {
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fn read_watts(&self) -> f64 {
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self.watts
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}
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}
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/// Trapezoidal integration of power samples (must be sorted by timestamp).
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pub fn estimate_energy(samples: &[PowerSample]) -> EnergyResult {
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let n = samples.len();
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if n < 2 {
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return EnergyResult {
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total_joules: 0.0,
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samples: n,
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duration_s: 0.0,
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mean_watts: samples.first().map_or(0.0, |s| s.watts),
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peak_watts: samples.first().map_or(0.0, |s| s.watts),
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};
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}
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let (mut joules, mut peak, mut sum) = (0.0f64, f64::NEG_INFINITY, 0.0f64);
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for i in 0..n {
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let w = samples[i].watts;
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sum += w;
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if w > peak {
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peak = w;
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}
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if i > 0 {
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let dt = samples[i]
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.timestamp_us
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.saturating_sub(samples[i - 1].timestamp_us) as f64
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/ 1e6;
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joules += (samples[i - 1].watts + w) / 2.0 * dt;
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}
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}
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let dur = samples
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.last()
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.unwrap()
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.timestamp_us
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.saturating_sub(samples[0].timestamp_us) as f64
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/ 1e6;
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EnergyResult {
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total_joules: joules,
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mean_watts: sum / n as f64,
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peak_watts: peak,
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duration_s: dur,
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samples: n,
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}
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}
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pub struct PowerTracker {
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pub samples: Vec<PowerSample>,
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pub label: String,
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}
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impl PowerTracker {
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pub fn new(label: &str) -> Self {
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Self {
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samples: Vec::new(),
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label: label.to_string(),
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}
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}
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pub fn sample(&mut self, source: &dyn PowerSource) {
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let ts = std::time::SystemTime::now()
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.duration_since(std::time::UNIX_EPOCH)
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.unwrap_or_default()
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.as_micros() as u64;
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self.samples.push(PowerSample {
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watts: source.read_watts(),
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timestamp_us: ts,
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});
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}
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pub fn energy(&self) -> EnergyResult {
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estimate_energy(&self.samples)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn ps(w: f64, t: u64) -> PowerSample {
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PowerSample {
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watts: w,
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timestamp_us: t,
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}
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}
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#[test]
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fn energy_empty() {
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let r = estimate_energy(&[]);
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assert_eq!(r.samples, 0);
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}
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#[test]
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fn energy_single() {
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let r = estimate_energy(&[ps(42.0, 0)]);
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assert_eq!((r.total_joules, r.mean_watts), (0.0, 42.0));
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}
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#[test]
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fn energy_constant_100w_1s() {
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let r = estimate_energy(&[ps(100.0, 0), ps(100.0, 1_000_000)]);
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assert!((r.total_joules - 100.0).abs() < 1e-9);
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}
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#[test]
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fn energy_ramp() {
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let r = estimate_energy(&[ps(0.0, 0), ps(200.0, 1_000_000)]);
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assert!((r.total_joules - 100.0).abs() < 1e-9);
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}
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#[test]
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fn mock_source() {
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assert_eq!(MockPowerSource { watts: 75.0 }.read_watts(), 75.0);
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}
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#[test]
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fn tracker_collects() {
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let src = MockPowerSource { watts: 50.0 };
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let mut t = PowerTracker::new("gpu");
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t.sample(&src);
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t.sample(&src);
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assert_eq!(t.samples.len(), 2);
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}
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}
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