52 lines
1.7 KiB
Python
52 lines
1.7 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 to a positive number and the weighing has the opposite effect of the
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default.
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"""
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from oslo.config import cfg
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from nova.scheduler import weights
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io_ops_weight_opts = [
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cfg.FloatOpt('io_ops_weight_multiplier',
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default=-1.0,
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help='Multiplier used for weighing host io ops. Negative '
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'numbers mean a preference to choose light workload '
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'compute hosts.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(io_ops_weight_opts)
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class IoOpsWeigher(weights.BaseHostWeigher):
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minval = 0
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def weight_multiplier(self):
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"""Override the weight multiplier."""
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return CONF.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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