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# 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 Scheduler metrics weights.
"""
from nova import exception
from nova import objects
from nova.objects import fields
from nova.objects import monitor_metric
from nova.scheduler import weights
from nova.scheduler.weights import metrics
from nova import test
from nova.tests.unit.scheduler import fakes
idle = fields.MonitorMetricType.CPU_IDLE_TIME
kernel = fields.MonitorMetricType.CPU_KERNEL_TIME
user = fields.MonitorMetricType.CPU_USER_TIME
def fake_metric(name, value):
return monitor_metric.MonitorMetric(name=name, value=value)
def fake_list(objs):
m_list = [fake_metric(name, val) for name, val in objs]
return monitor_metric.MonitorMetricList(objects=m_list)
class MetricsWeigherTestCase(test.NoDBTestCase):
def setUp(self):
super(MetricsWeigherTestCase, self).setUp()
self.weight_handler = weights.HostWeightHandler()
self.weighers = [metrics.MetricsWeigher()]
self.metrics_weigher = metrics.MetricsWeigher()
def _get_weighed_host(self, hosts, setting, weight_properties=None):
if not weight_properties:
weight_properties = {}
self.flags(weight_setting=setting, group='metrics')
self.weighers[0]._parse_setting()
return self.weight_handler.get_weighed_objects(self.weighers,
hosts, weight_properties)[0]
def _get_all_hosts(self):
host_values = [
('host1', 'node1', {'metrics': fake_list([(idle, 512),
(kernel, 1)])}),
('host2', 'node2', {'metrics': fake_list([(idle, 1024),
(kernel, 2)])}),
('host3', 'node3', {'metrics': fake_list([(idle, 3072),
(kernel, 1)])}),
('host4', 'node4', {'metrics': fake_list([(idle, 8192),
(kernel, 0)])}),
('host5', 'node5', {'metrics': fake_list([(idle, 768),
(kernel, 0),
(user, 1)])}),
('host6', 'node6', {'metrics': fake_list([(idle, 2048),
(kernel, 0),
(user, 2)])}),
]
return [fakes.FakeHostState(host, node, values)
for host, node, values in host_values]
def _do_test(self, settings, expected_weight, expected_host):
hostinfo_list = self._get_all_hosts()
weighed_host = self._get_weighed_host(hostinfo_list, settings)
self.assertEqual(expected_weight, weighed_host.weight)
self.assertEqual(expected_host, weighed_host.obj.host)
def test_single_resource_no_metrics(self):
setting = [idle + '=1']
hostinfo_list = [fakes.FakeHostState('host1', 'node1',
{'metrics': None}),
fakes.FakeHostState('host2', 'node2',
{'metrics': None})]
self.assertRaises(exception.ComputeHostMetricNotFound,
self._get_weighed_host, hostinfo_list, setting)
def test_single_resource(self):
# host1: idle=512
# host2: idle=1024
# host3: idle=3072
# host4: idle=8192
# so, host4 should win:
setting = [idle + '=1']
self._do_test(setting, 1.0, 'host4')
def test_multiple_resource(self):
# host1: idle=512, kernel=1
# host2: idle=1024, kernel=2
# host3: idle=3072, kernel=1
# host4: idle=8192, kernel=0
# so, host2 should win:
setting = [idle + '=0.0001', kernel + '=1']
self._do_test(setting, 1.0, 'host2')
def test_single_resource_duplicate_setting(self):
# host1: idle=512
# host2: idle=1024
# host3: idle=3072
# host4: idle=8192
# so, host1 should win (sum of settings is negative):
setting = [idle + '=-2', idle + '=1']
self._do_test(setting, 1.0, 'host1')
def test_single_resourcenegative_ratio(self):
# host1: idle=512
# host2: idle=1024
# host3: idle=3072
# host4: idle=8192
# so, host1 should win:
setting = [idle + '=-1']
self._do_test(setting, 1.0, 'host1')
def test_multiple_resource_missing_ratio(self):
# host1: idle=512, kernel=1
# host2: idle=1024, kernel=2
# host3: idle=3072, kernel=1
# host4: idle=8192, kernel=0
# so, host4 should win:
setting = [idle + '=0.0001', kernel]
self._do_test(setting, 1.0, 'host4')
def test_multiple_resource_wrong_ratio(self):
# host1: idle=512, kernel=1
# host2: idle=1024, kernel=2
# host3: idle=3072, kernel=1
# host4: idle=8192, kernel=0
# so, host4 should win:
setting = [idle + '=0.0001', kernel + ' = 2.0t']
self._do_test(setting, 1.0, 'host4')
def _check_parsing_result(self, weigher, setting, results):
self.flags(weight_setting=setting, group='metrics')
weigher._parse_setting()
self.assertEqual(len(weigher.setting), len(results))
for item in results:
self.assertIn(item, weigher.setting)
def test_parse_setting(self):
weigher = self.weighers[0]
self._check_parsing_result(weigher,
[idle + '=1'],
[(idle, 1.0)])
self._check_parsing_result(weigher,
[idle + '=1', kernel + '=-2.1'],
[(idle, 1.0), (kernel, -2.1)])
self._check_parsing_result(weigher,
[idle + '=a1', kernel + '=-2.1'],
[(kernel, -2.1)])
self._check_parsing_result(weigher,
[idle, kernel + '=-2.1'],
[(kernel, -2.1)])
self._check_parsing_result(weigher,
['=5', kernel + '=-2.1'],
[(kernel, -2.1)])
def test_metric_not_found_required(self):
setting = [idle + '=1', user + '=2']
self.assertRaises(exception.ComputeHostMetricNotFound,
self._do_test,
setting,
8192,
'host4')
def test_metric_not_found_non_required(self):
# host1: idle=512, kernel=1
# host2: idle=1024, kernel=2
# host3: idle=3072, kernel=1
# host4: idle=8192, kernel=0
# host5: idle=768, kernel=0, user=1
# host6: idle=2048, kernel=0, user=2
# so, host5 should win:
self.flags(required=False, group='metrics')
setting = [idle + '=0.0001', user + '=-1']
self._do_test(setting, 1.0, 'host5')
def test_metrics_weigher_multiplier(self):
self.flags(weight_multiplier=-1.0, group='metrics')
host_attr = {'metrics': fake_list([(idle, 512), (kernel, 1)])}
host1 = fakes.FakeHostState('fake-host', 'node', host_attr)
# By default, return the weight_multiplier configuration directly
self.assertEqual(-1, self.metrics_weigher.weight_multiplier(host1))
host1.aggregates = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'metrics_weight_multiplier': '2'},
)]
# read the weight multiplier from metadata to override the config
self.assertEqual(2.0, self.metrics_weigher.weight_multiplier(host1))
host1.aggregates = [
objects.Aggregate(
id=1,
name='foo',
hosts=['fake-host'],
metadata={'metrics_weight_multiplier': '2'},
),
objects.Aggregate(
id=2,
name='foo',
hosts=['fake-host'],
metadata={'metrics_weight_multiplier': '1.5'},
)]
# If the host is in multiple aggs and there are conflict weight values
# in the metadata, we will use the min value among them
self.assertEqual(1.5, self.metrics_weigher.weight_multiplier(host1))
def test_host_with_agg(self):
# host1: idle=512, kernel=1
# host2: idle=1024, kernel=2
# host3: idle=3072, kernel=1
# host4: idle=8192, kernel=0
# so, host4 should win:
setting = [idle + '=0.0001', kernel]
hostinfo_list = self._get_all_hosts()
aggs = [
objects.Aggregate(
id=1,
name='foo',
hosts=['host1', 'host2', 'host3', 'host4', 'host5', 'host6'],
metadata={'metrics_weight_multiplier': '1.5'},
)]
for h in hostinfo_list:
h.aggregates = aggs
weighed_host = self._get_weighed_host(hostinfo_list, setting)
self.assertEqual(1.5, weighed_host.weight)
self.assertEqual('host4', weighed_host.obj.host)
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