48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
# Copyright (c) 2011 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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RAM Weigher. Weigh hosts by their RAM 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 'ram_weight_multiplier' option to a negative
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number and the weighing has the opposite effect of the 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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ram_weight_opts = [
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cfg.FloatOpt('ram_weight_multiplier',
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default=1.0,
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help='Multiplier used for weighing ram. Negative '
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'numbers mean to stack vs spread.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(ram_weight_opts)
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class RAMWeigher(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.ram_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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return host_state.free_ram_mb
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