47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
# Copyright (c) 2016, Red Hat Inc.
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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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CPU Weigher. Weigh hosts by their CPU usage.
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The default is to spread instances across all hosts evenly. If you prefer
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stacking, you can set the 'cpu_weight_multiplier' option (by configuration
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or aggregate metadata) to a negative number and the weighing has the opposite
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effect of the default.
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"""
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import nova.conf
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from nova.scheduler import utils
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from nova.scheduler import weights
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CONF = nova.conf.CONF
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class CPUWeigher(weights.BaseHostWeigher):
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minval = 0
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def weight_multiplier(self, host_state):
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"""Override the weight multiplier."""
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return utils.get_weight_multiplier(
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host_state, 'cpu_weight_multiplier',
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CONF.filter_scheduler.cpu_weight_multiplier)
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def _weigh_object(self, host_state, weight_properties):
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"""Higher weights win. We want spreading to be the default."""
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vcpus_free = (
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host_state.vcpus_total * host_state.cpu_allocation_ratio -
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host_state.vcpus_used)
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return vcpus_free
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