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test_resource_monitor.py
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test_resource_monitor.py
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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from __future__ import absolute_import
import multiprocessing
import time
import unittest
import mozunit
try:
import psutil
except ImportError:
psutil = None
from mozsystemmonitor.resourcemonitor import (
SystemResourceMonitor,
SystemResourceUsage,
)
@unittest.skipIf(psutil is None, 'Resource monitor requires psutil.')
class TestResourceMonitor(unittest.TestCase):
def test_basic(self):
monitor = SystemResourceMonitor(poll_interval=0.5)
monitor.start()
time.sleep(3)
monitor.stop()
data = list(monitor.range_usage())
self.assertGreater(len(data), 3)
self.assertIsInstance(data[0], SystemResourceUsage)
def test_empty(self):
monitor = SystemResourceMonitor(poll_interval=2.0)
monitor.start()
monitor.stop()
data = list(monitor.range_usage())
self.assertEqual(len(data), 0)
def test_phases(self):
monitor = SystemResourceMonitor(poll_interval=0.25)
monitor.start()
time.sleep(1)
with monitor.phase('phase1'):
time.sleep(1)
with monitor.phase('phase2'):
time.sleep(1)
monitor.stop()
self.assertEqual(len(monitor.phases), 2)
self.assertEqual(['phase2', 'phase1'], monitor.phases.keys())
all = list(monitor.range_usage())
data1 = list(monitor.phase_usage('phase1'))
data2 = list(monitor.phase_usage('phase2'))
self.assertGreater(len(all), len(data1))
self.assertGreater(len(data1), len(data2))
# This could fail if time.time() takes more than 0.1s. It really
# shouldn't.
self.assertAlmostEqual(data1[-1].end, data2[-1].end, delta=0.25)
def test_no_data(self):
monitor = SystemResourceMonitor()
data = list(monitor.range_usage())
self.assertEqual(len(data), 0)
def test_events(self):
monitor = SystemResourceMonitor(poll_interval=0.25)
monitor.start()
time.sleep(0.5)
t0 = time.time()
monitor.record_event('t0')
time.sleep(0.5)
monitor.record_event('t1')
time.sleep(0.5)
monitor.stop()
events = monitor.events
self.assertEqual(len(events), 2)
event = events[0]
self.assertEqual(event[1], 't0')
self.assertAlmostEqual(event[0], t0, delta=0.25)
data = list(monitor.between_events_usage('t0', 't1'))
self.assertGreater(len(data), 0)
def test_aggregate_cpu(self):
monitor = SystemResourceMonitor(poll_interval=0.25)
monitor.start()
time.sleep(1)
monitor.stop()
values = monitor.aggregate_cpu_percent()
self.assertIsInstance(values, list)
self.assertEqual(len(values), multiprocessing.cpu_count())
for v in values:
self.assertIsInstance(v, float)
value = monitor.aggregate_cpu_percent(per_cpu=False)
self.assertIsInstance(value, float)
values = monitor.aggregate_cpu_times()
self.assertIsInstance(values, list)
self.assertGreater(len(values), 0)
self.assertTrue(hasattr(values[0], 'user'))
t = type(values[0])
value = monitor.aggregate_cpu_times(per_cpu=False)
self.assertIsInstance(value, t)
def test_aggregate_io(self):
monitor = SystemResourceMonitor(poll_interval=0.25)
# There's really no easy way to ensure I/O occurs. For all we know
# reads and writes will all be serviced by the page cache.
monitor.start()
time.sleep(1.0)
monitor.stop()
values = monitor.aggregate_io()
self.assertTrue(hasattr(values, 'read_count'))
def test_memory(self):
monitor = SystemResourceMonitor(poll_interval=0.25)
monitor.start()
time.sleep(1.0)
monitor.stop()
v = monitor.min_memory_available()
self.assertIsInstance(v, long)
v = monitor.max_memory_percent()
self.assertIsInstance(v, float)
def test_as_dict(self):
monitor = SystemResourceMonitor(poll_interval=0.25)
monitor.start()
time.sleep(0.1)
monitor.begin_phase('phase1')
monitor.record_event('foo')
time.sleep(0.1)
monitor.begin_phase('phase2')
monitor.record_event('bar')
time.sleep(0.2)
monitor.finish_phase('phase1')
time.sleep(0.2)
monitor.finish_phase('phase2')
time.sleep(0.4)
monitor.stop()
d = monitor.as_dict()
self.assertEqual(d['version'], 2)
self.assertEqual(len(d['events']), 2)
self.assertEqual(len(d['phases']), 2)
self.assertIn('system', d)
self.assertIsInstance(d['system'], dict)
self.assertIsInstance(d['overall'], dict)
self.assertIn('duration', d['overall'])
self.assertIn('cpu_times', d['overall'])
if __name__ == '__main__':
mozunit.main()