File size: 1,113 Bytes
c323b52 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | from pynvml import *
import time
class GPUEnergyTracker:
"""
GPU energy monitor using NVIDIA NVML.
Measures instantaneous power and integrates
it over time to estimate total GPU energy
consumption.
Units
Power : Watts
Energy : Joules
"""
def __init__(self, gpu_index=0):
nvmlInit()
self.handle = nvmlDeviceGetHandleByIndex(gpu_index)
self.energy_joules = 0.0
self.last_time = time.time()
self.last_power = self._read_power()
def _read_power(self):
power_mw = nvmlDeviceGetPowerUsage(self.handle)
return power_mw / 1000.0
def step(self):
current_time = time.time()
power = self._read_power()
dt = current_time - self.last_time
# trapezoidal integration
self.energy_joules += 0.5 * (self.last_power + power) * dt
self.last_power = power
self.last_time = current_time
def total_energy(self):
return self.energy_joules
def current_power(self):
return self.last_power |