simple python script to check cpu utilization of lxc containers and print percentage

lxc_load.py

#!/usr/bin/python

import multiprocessing, os, re, sys, time

cgroup_dir = '/sys/fs/cgroup'
node_rgx = u'[a-z]*[0-9]{2}'
interval = 1 

def main():
  cpus = multiprocessing.cpu_count()
  startval = get_values()
  time.sleep(interval)
  endval = get_values()
  for key, value in startval.iteritems():
    if key in endval:
      delta = int(endval[key]) - int(startval[key])
      dpns = float(delta / interval)
      dps = dpns / 1000000000
      percent = dps / cpus
      print key + ':' + '{percent:.2%}'.format(percent=percent)
    

def get_values():
  values = {}
  if os.path.exists('%s/cpuacct.usage' % cgroup_dir):
    with open('%s/cpuacct.usage' % cgroup_dir, 'rb') as tobj:
      values['total'] = tobj.read()
  else:
    sys.exit(1)
  for fd in os.listdir(cgroup_dir):
    if os.path.isdir('%s/%s' % (cgroup_dir, fd)) and re.match(node_rgx, fd):
      acctf = '%s/%s/cpuacct.usage' % (cgroup_dir, fd) 
      if os.path.isfile(acctf):
        with open(acctf, 'rb') as accto:
          values[fd] = accto.read()
  return values


if __name__ == "__main__":
  main()

Hi Wryfi,
Thanks a lot for your script.
I understand that it is done for all the present containers.
I have a question : does your script compute the "cpuacct.usage" for the total number of cpus or just for 1 per cpu ?
I will very appreciate your answer.
Regards.

As you can see in line 10 (where he reaches for the total number of CPUs) and line 19 (where he divides the percentage), he is 😉

Thank you!

(Forked at https://gist.github.com/palepurple/61b5f644b868ecd484c5 - add ability to suppress low usage containers and to change the interval).

Count neither match with Top nor with docker stats