127 lines
5.0 KiB
Python
127 lines
5.0 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Tests For Scheduler IoOpsWeigher weights
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"""
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from nova import objects
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from nova.scheduler import weights
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from nova.scheduler.weights import io_ops
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from nova import test
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from nova.tests.unit.scheduler import fakes
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class IoOpsWeigherTestCase(test.NoDBTestCase):
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def setUp(self):
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super(IoOpsWeigherTestCase, self).setUp()
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self.weight_handler = weights.HostWeightHandler()
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self.weighers = [io_ops.IoOpsWeigher()]
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self.ioops_weigher = io_ops.IoOpsWeigher()
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def _get_weighed_host(self, hosts, io_ops_weight_multiplier):
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if io_ops_weight_multiplier is not None:
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self.flags(io_ops_weight_multiplier=io_ops_weight_multiplier,
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group='filter_scheduler')
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return self.weight_handler.get_weighed_objects(self.weighers,
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hosts, {})[0]
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def _get_all_hosts(self):
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host_values = [
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('host1', 'node1', {'num_io_ops': 1}),
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('host2', 'node2', {'num_io_ops': 2}),
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('host3', 'node3', {'num_io_ops': 0}),
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('host4', 'node4', {'num_io_ops': 4})
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]
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return [fakes.FakeHostState(host, node, values)
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for host, node, values in host_values]
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def _do_test(self, io_ops_weight_multiplier, expected_weight,
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expected_host):
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hostinfo_list = self._get_all_hosts()
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weighed_host = self._get_weighed_host(hostinfo_list,
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io_ops_weight_multiplier)
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self.assertEqual(weighed_host.weight, expected_weight)
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if expected_host:
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self.assertEqual(weighed_host.obj.host, expected_host)
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def test_io_ops_weight_multiplier_by_default(self):
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self._do_test(io_ops_weight_multiplier=None,
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expected_weight=0.0,
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expected_host='host3')
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def test_io_ops_weight_multiplier_zero_value(self):
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# We do not know the host, all have same weight.
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self._do_test(io_ops_weight_multiplier=0.0,
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expected_weight=0.0,
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expected_host=None)
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def test_io_ops_weight_multiplier_positive_value(self):
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self._do_test(io_ops_weight_multiplier=2.0,
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expected_weight=2.0,
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expected_host='host4')
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def test_io_ops_weight_multiplier(self):
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self.flags(io_ops_weight_multiplier=0.0,
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group='filter_scheduler')
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host_attr = {'num_io_ops': 1}
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host1 = fakes.FakeHostState('fake-host', 'node', host_attr)
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# By default, return the weight_multiplier configuration directly
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self.assertEqual(0.0, self.ioops_weigher.weight_multiplier(host1))
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host1.aggregates = [
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objects.Aggregate(
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id=1,
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name='foo',
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hosts=['fake-host'],
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metadata={'io_ops_weight_multiplier': '1'},
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)]
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# read the weight multiplier from metadata to override the config
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self.assertEqual(1.0, self.ioops_weigher.weight_multiplier(host1))
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host1.aggregates = [
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objects.Aggregate(
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id=1,
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name='foo',
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hosts=['fake-host'],
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metadata={'io_ops_weight_multiplier': '1'},
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),
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objects.Aggregate(
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id=2,
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name='foo',
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hosts=['fake-host'],
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metadata={'io_ops_weight_multiplier': '0.5'},
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)]
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# If the host is in multiple aggs and there are conflict weight values
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# in the metadata, we will use the min value among them
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self.assertEqual(0.5, self.ioops_weigher.weight_multiplier(host1))
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def test_host_with_agg(self):
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self.flags(io_ops_weight_multiplier=0.0,
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group='filter_scheduler')
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hostinfo_list = self._get_all_hosts()
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aggs = [
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objects.Aggregate(
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id=1,
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name='foo',
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hosts=['host1', 'host2', 'host3', 'host4'],
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metadata={'io_ops_weight_multiplier': '1.5'},
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)]
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for h in hostinfo_list:
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h.aggregates = aggs
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weights = self.weight_handler.get_weighed_objects(self.weighers,
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hostinfo_list, {})
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weighed_host = weights[0]
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self.assertEqual(1.0 * 1.5, weighed_host.weight)
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self.assertEqual('host4', weighed_host.obj.host)
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