130 lines
5.2 KiB
Python
130 lines
5.2 KiB
Python
# Copyright 2011-2012 OpenStack Foundation
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# All Rights Reserved.
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#
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# 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 Capacity Weigher.
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"""
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import mock
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from oslo_config import cfg
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from cinder import context
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from cinder.openstack.common.scheduler import weights
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from cinder.scheduler.weights import capacity
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from cinder import test
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from cinder.tests.unit.scheduler import fakes
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from cinder.volume import utils
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CONF = cfg.CONF
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class CapacityWeigherTestCase(test.TestCase):
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def setUp(self):
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super(CapacityWeigherTestCase, self).setUp()
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self.host_manager = fakes.FakeHostManager()
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self.weight_handler = weights.HostWeightHandler(
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'cinder.scheduler.weights')
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def _get_weighed_host(self, hosts, weight_properties=None):
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if weight_properties is None:
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weight_properties = {'size': 1}
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return self.weight_handler.get_weighed_objects(
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[capacity.CapacityWeigher],
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hosts,
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weight_properties)[0]
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@mock.patch('cinder.db.sqlalchemy.api.service_get_all_by_topic')
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def _get_all_hosts(self, _mock_service_get_all_by_topic, disabled=False):
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ctxt = context.get_admin_context()
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fakes.mock_host_manager_db_calls(_mock_service_get_all_by_topic,
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disabled=disabled)
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host_states = self.host_manager.get_all_host_states(ctxt)
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_mock_service_get_all_by_topic.assert_called_once_with(
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ctxt, CONF.volume_topic, disabled=disabled)
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return host_states
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# If thin_provisioning_support = False, use the following formula:
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# free = free_space - math.floor(total * reserved)
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# Otherwise, use the following formula:
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# free = (total * host_state.max_over_subscription_ratio
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# - host_state.provisioned_capacity_gb
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# - math.floor(total * reserved))
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def test_default_of_spreading_first(self):
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hostinfo_list = self._get_all_hosts()
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# host1: thin_provisioning_support = False
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# free_capacity_gb=1024,
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# free=1024-math.floor(1024*0.1)=922
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# host2: thin_provisioning_support = True
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# free_capacity_gb=300,
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# free=2048*1.5-1748-math.floor(2048*0.1)=1120
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# host3: thin_provisioning_support = False
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# free_capacity_gb=512, free=256-512*0=256
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# host4: thin_provisioning_support = True
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# free_capacity_gb=200,
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# free=2048*1.0-2047-math.floor(2048*0.05)=-101
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# host5: free_capacity_gb=unknown free=-1
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# so, host2 should win:
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weighed_host = self._get_weighed_host(hostinfo_list)
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self.assertEqual(weighed_host.weight, 1120.0)
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self.assertEqual(
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utils.extract_host(weighed_host.obj.host), 'host2')
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def test_capacity_weight_multiplier1(self):
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self.flags(capacity_weight_multiplier=-1.0)
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hostinfo_list = self._get_all_hosts()
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# host1: thin_provisioning_support = False
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# free_capacity_gb=1024,
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# free=-(1024-math.floor(1024*0.1))=-922
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# host2: thin_provisioning_support = True
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# free_capacity_gb=300,
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# free=-(2048*1.5-1748-math.floor(2048*0.1))=-1120
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# host3: thin_provisioning_support = False
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# free_capacity_gb=512, free=-(256-512*0)=-256
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# host4: thin_provisioning_support = True
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# free_capacity_gb=200,
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# free=-(2048*1.0-2047-math.floor(2048*0.05))=101
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# host5: free_capacity_gb=unknown free=-float('inf')
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# so, host4 should win:
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weighed_host = self._get_weighed_host(hostinfo_list)
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self.assertEqual(weighed_host.weight, 101.0)
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self.assertEqual(
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utils.extract_host(weighed_host.obj.host), 'host4')
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def test_capacity_weight_multiplier2(self):
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self.flags(capacity_weight_multiplier=2.0)
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hostinfo_list = self._get_all_hosts()
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# host1: thin_provisioning_support = False
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# free_capacity_gb=1024,
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# free=(1024-math.floor(1024*0.1))*2=1844
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# host2: thin_provisioning_support = True
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# free_capacity_gb=300,
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# free=(2048*1.5-1748-math.floor(2048*0.1))*2=2240
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# host3: thin_provisioning_support = False
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# free_capacity_gb=512, free=(256-512*0)*2=512
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# host4: thin_provisioning_support = True
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# free_capacity_gb=200,
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# free=(2048*1.0-2047-math.floor(2048*0.05))*2=-202
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# host5: free_capacity_gb=unknown free=-2
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# so, host2 should win:
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weighed_host = self._get_weighed_host(hostinfo_list)
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self.assertEqual(weighed_host.weight, 1120.0 * 2)
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self.assertEqual(
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utils.extract_host(weighed_host.obj.host), 'host2')
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