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()