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OpenStack Study: ram_by_instance_type.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012-2013 Rackspace Hosting # All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """ Weigh cells by memory needed in a way that spreads instances. """ from oslo.config import cfg from nova.cells import weights ram_weigher_opts = [ cfg.FloatOpt('ram_weight_multiplier', default=10.0, help='Multiplier used for weighing ram. Negative ' 'numbers mean to stack vs spread.'), ] CONF = cfg.CONF CONF.register_opts(ram_weigher_opts, group='cells')
**** CubicPower OpenStack Study **** class RamByInstanceTypeWeigher(weights.BaseCellWeigher): """Weigh cells by instance_type requested."""
**** CubicPower OpenStack Study **** def weight_multiplier(self): return CONF.cells.ram_weight_multiplier
**** CubicPower OpenStack Study **** def _weigh_object(self, cell, weight_properties): """Use the 'ram_free' for a particular instance_type advertised from a child cell's capacity to compute a weight. We want to direct the build to a cell with a higher capacity. Since higher weights win, we just return the number of units available for the instance_type. """ request_spec = weight_properties['request_spec'] instance_type = request_spec['instance_type'] memory_needed = instance_type['memory_mb'] ram_free = cell.capacities.get('ram_free', {}) units_by_mb = ram_free.get('units_by_mb', {}) return units_by_mb.get(str(memory_needed), 0)
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