CODEWITHSUNDEEP
pythontimeifconfig
John Pydev
John Pydev

Reputation: 21

How to calculate data transfer ifconfig per second in python?

I have script like this

import os
import time
os.chdir('/sys/class/net/wlan1/statistics')

while True:
    up = open('tx_bytes').read()
    time.sleep(1)
    print 'UP:',up

And the value is

UP: 2177453

UP: 2177539

UP: 2177789

UP: 2177990

How to find diferent value TX bytes after delay time.sleep and Befor delay time.sleep to get bandwidth Byte persecond? Byte persecond = TXbytes_after_time_sleep - TXbytes_before_time_sleep and the value can loopen no endless with while true.

Upvotes: 0

Views: 687

Answers (2)

Prune
Prune

Reputation: 77880

What is your worry so far? YOu have a certain amount of innate overhead, since you have to return to the start of the file. We can reduce it somewhat by getting rid of the superfluous open commands:

import time
old = 0
with open('/sys/class/net/wlan1/statistics/tx_bytes') as vol:
    while True:
        vol.seek(0)
        new = vol.read()
        time.sleep(1)
        print "UP:", new-old
        old = new

The seek command resets the file's "bookmark"" to byte 0, the start of the file. It's faster than reopening the file, since it's merely an integer assignment to an object attribute.

Is this granularity good enough for your purposes?

Upvotes: 1

Bharel
Bharel

Reputation: 26951

Just like you did I guess.

It's quite rough and not very accurate but the same time spent reading the before is taken into account in reading the after so I guess it's fine.

with open('/sys/class/net/wlan1/statistics/tx_bytes') as myfile:
    before = myfile.read()
time.sleep(3)  # The longer this is the more accurate it will be on average.
with open('/sys/class/net/wlan1/statistics/tx_bytes') as myfile:
    after = myfile.read()
print((int(after)-int(before))/3)

Upvotes: 0

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