how long it takes to list a new device in getVdsStats

getVdsStats_new_device.py

#!/bin/python
""" NOTE:
before running this script, ensure there is no dummy_1/2 listed in getVdsCaps
"""

import time
import os
import sys

from vdsm import vdscli

c = vdscli.connect()


def _getVdsStats_nets():
    time.sleep(1)
    sys.stdout.write('.')
    sys.stdout.flush()
    result = c.getVdsStats()
    assert result['status']['code'] == 0
    return result['info']['network']

# wait for the first dummy to appear
rc = os.system("ip link add dummy_1 type dummy")
assert rc == 0
while True:
    nets = _getVdsStats_nets()
    if 'dummy_1' in nets:
        print('\nstart')
        break

# start stopwatch and wait till the second dummy will appear
t_start = time.time()
rc = os.system("ip link add dummy_2 type dummy")
while True:
    nets = _getVdsStats_nets()
    if 'dummy_2' in nets:
        t_stop = time.time()
        break

print("\ndone")
print(t_stop - t_start)