45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
# Copyright (c) 2014 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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Io Ops Weigher. Weigh hosts by their io ops number.
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The default is to preferably choose light workload compute hosts. If you prefer
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choosing heavy workload compute hosts, you can set 'io_ops_weight_multiplier'
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option (by configuration or aggregate metadata) to a positive number and the
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weighing has the opposite 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 IoOpsWeigher(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, 'io_ops_weight_multiplier',
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CONF.filter_scheduler.io_ops_weight_multiplier)
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def _weigh_object(self, host_state, weight_properties):
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"""Higher weights win. We want to choose light workload host
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to be the default.
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"""
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return host_state.num_io_ops
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