Undervolt Stability Tester

undervolt_iter.py

#!/usr/bin/python
"""Iteratively decrease the core and cache voltage offset until system
becomes unstable.

Requires:
- undervolt

start by running
$ sudo modprobe msr

This script must be run as sudo

To genuinely test for stability, have "stress -c" running in the
background with the maximum number of threads.

"""
import time
import undervolt

inc = 2
wait_time = 10*60

core, cache = -100, -100
undervolt.set_offset('core', core)
undervolt.set_offset('cache', cache)

print('Initial voltage offsets: ', core, cache)
print('Incrementing -%f mV' % inc)
print('Waiting %d seconds at each step' % wait_time)

with open('log.txt', 'w') as f:

    while True:
        txt = '%d, Core %f, Cache %f\n' % (time.time(), core, cache)
        f.write(txt); f.flush()
        print(txt)
        time.sleep(wait_time)

        core -= inc
        cache -= inc
        undervolt.set_offset('core', core)
        undervolt.set_offset('cache', cache)