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# Copyright 2013 Intel Corporation
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Tests for Compute Driver CPU resource monitor."""
import mock
from nova.compute.monitors.cpu import virt_driver
from nova import objects
from nova import test
class FakeDriver(object):
def get_host_cpu_stats(self):
return {'kernel': 5664160000000,
'idle': 1592705190000000,
'frequency': 800,
'user': 26728850000000,
'iowait': 6121490000000}
class FakeResourceTracker(object):
driver = FakeDriver()
class VirtDriverCPUMonitorTestCase(test.NoDBTestCase):
def test_get_metric_names(self):
monitor = virt_driver.Monitor(FakeResourceTracker())
names = monitor.get_metric_names()
self.assertEqual(10, len(names))
self.assertIn("cpu.frequency", names)
self.assertIn("cpu.user.time", names)
self.assertIn("cpu.kernel.time", names)
self.assertIn("cpu.idle.time", names)
self.assertIn("cpu.iowait.time", names)
self.assertIn("cpu.user.percent", names)
self.assertIn("cpu.kernel.percent", names)
self.assertIn("cpu.idle.percent", names)
self.assertIn("cpu.iowait.percent", names)
self.assertIn("cpu.percent", names)
def test_populate_metrics(self):
metrics = objects.MonitorMetricList()
monitor = virt_driver.Monitor(FakeResourceTracker())
monitor.populate_metrics(metrics)
names = monitor.get_metric_names()
for metric in metrics.objects:
self.assertIn(metric.name, names)
# Some conversion to a dict to ease testing...
metrics = {m.name: m.value for m in metrics.objects}
self.assertEqual(metrics["cpu.frequency"], 800)
self.assertEqual(metrics["cpu.user.time"], 26728850000000)
self.assertEqual(metrics["cpu.kernel.time"], 5664160000000)
self.assertEqual(metrics["cpu.idle.time"], 1592705190000000)
self.assertEqual(metrics["cpu.iowait.time"], 6121490000000)
self.assertEqual(metrics["cpu.user.percent"], 1)
self.assertEqual(metrics["cpu.kernel.percent"], 0)
self.assertEqual(metrics["cpu.idle.percent"], 97)
self.assertEqual(metrics["cpu.iowait.percent"], 0)
self.assertEqual(metrics["cpu.percent"], 2)
def test_ensure_single_sampling(self):
# We want to ensure that the virt driver's get_host_cpu_stats()
# is only ever called once, otherwise values for monitor metrics
# might be illogical -- e.g. pct cpu times for user/system/idle
# may add up to more than 100.
metrics = objects.MonitorMetricList()
monitor = virt_driver.Monitor(FakeResourceTracker())
with mock.patch.object(FakeDriver, 'get_host_cpu_stats') as mocked:
monitor.populate_metrics(metrics)
mocked.assert_called_once_with()
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