power-consumption.py

gistfile1.txt

#!/usr/bin/env python3

"""
This stript when run collects the power consumption of a NUC during
one minute and writes it, together with the date/time into a file
for future use.

I want to try to see how much my NUC consumes during different phases
during a day/week.
"""

import os
import time
from datetime import datetime

print(datetime.now().strftime('%Y-%m-%d %H:%M:%S'))

offset = 1 * 60
energyPath = "/sys/class/powercap/intel-rapl:0/energy_uj"
fd = os.open(energyPath,  os.O_RDONLY)

old_energy = int(os.pread(fd, 127, 0))

while True:
    time.sleep(offset)
    energy = int(os.pread(fd, 127, 0))
    watt = int((energy - old_energy) / 1000000)
    old_energy = energy
    buf = datetime.now().strftime('%Y-%m-%d/%H:%M:%S') + " %d\n" % (watt)
    
    with open("power-consumption.txt", "a") as f:
        f.write(buf)