95th Percentile Logger

95.py

#!/usr/bin/env python3

import time

iface = 'enp1s0f0'
log = '95.log'
poll_interval = 1

bytes_in = '/sys/class/net/{}/statistics/rx_bytes'.format(iface)
bytes_out = '/sys/class/net/{}/statistics/tx_bytes'.format(iface)

last_in = 0
last_out = 0
while True:
    with open(bytes_in) as f:
        bytes_in_new = int(f.readline())
    with open(bytes_out) as f:
        bytes_out_new = int(f.readline())

    if not last_in:
        last_in = bytes_in_new
        last_out = bytes_out_new
        continue

    bytes_in_diff = bytes_in_new - last_in
    bytes_out_diff = bytes_out_new - last_out
    last_in = bytes_in_new
    last_out = bytes_out_new

    with open(log, 'a') as l:
        l.writelines('{},{},{}\n'.format(int(time.time()),bytes_in_diff,bytes_out_diff))

    time.sleep(poll_interval)