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To: python-list@python.org
From: Robert Kern <robert.kern@gmail.com>
Subject: Re: python process accounting
Date: Tue, 30 Apr 2013 19:19:35 +0100
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Xref: csiph.com comp.lang.python:44563

On 2013-04-30 17:25, Rita wrote:
> Hi,
>
> I was wondering if it possible to write a python wrapper which will account my
> processes. I would like to account for all the children processes (fork) by
> looking at their /proc/<pid> info. Such as memory, io, open files, stats.
>
> So, instead of me running "/bin/sleep 10", i would like to run it as "pywrap.py
> /bin/sleep 10" and it will do an exec /bin/sleep 10 and do a periodic snapshot
> for whats in /proc/<pid>/stats.

Something like this is approximately the right structure for such a program.


#!/usr/bin/env python

import sys
import subprocess
import time


PERIOD = 1.0  # seconds


def check_stats(pid):
     # You will have to implement this.
     # Check out psutil:
     #   https://pypi.python.org/pypi/psutil
     print 'Checking process {0}'.format(pid)


def main():
     cmd = sys.argv[1:]
     p = subprocess.Popen(cmd)
     while p.poll() is None:
         check_stats(p.pid)
         # There are more accurate ways to do this, but this probably
         # suffices for you.
         time.sleep(PERIOD)


if __name__ == '__main__':
     main()


-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco