56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
# Copyright (c) 2015 Cisco Systems, 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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IO Ops Cost. Calculate instance placement costs by hosts' IO ops numbers.
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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_cost_multiplier'
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option to a negative number and the cost 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_solverscheduler.scheduler.solvers import costs as solver_costs
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from nova_solverscheduler.scheduler.solvers.costs import utils
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io_ops_cost_opts = [
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cfg.FloatOpt('io_ops_cost_multiplier',
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default=1.0,
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help='Multiplier used for io ops cost. 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(io_ops_cost_opts, group='solver_scheduler')
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class IoOpsCost(solver_costs.BaseLinearCost):
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def cost_multiplier(self):
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return CONF.solver_scheduler.io_ops_cost_multiplier
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def get_extended_cost_matrix(self, hosts, filter_properties):
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num_hosts = len(hosts)
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num_instances = filter_properties.get('num_instances')
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extended_cost_matrix = [
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[hosts[i].num_io_ops + j for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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extended_cost_matrix = utils.normalize_cost_matrix(
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extended_cost_matrix)
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return extended_cost_matrix
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