59 lines
2.4 KiB
Python
59 lines
2.4 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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from oslo_log import log as logging
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from nova.i18n import _LW
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from nova_solverscheduler.scheduler.solvers import constraints
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LOG = logging.getLogger(__name__)
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class ExactRamConstraint(constraints.BaseLinearConstraint):
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"""Constraint that selects hosts with exact amount of RAM available."""
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def get_constraint_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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constraint_matrix = [[True for j in xrange(num_instances)]
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for i in xrange(num_hosts)]
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# get requested ram
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instance_type = filter_properties.get('instance_type') or {}
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requested_ram = instance_type.get('memory_mb', 0)
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if 'memory_mb' not in instance_type:
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LOG.warn(_LW("No information about requested instances\' RAM size "
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"was found, default value (0) is used."))
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if requested_ram <= 0:
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LOG.warn(_LW("ExactRamConstraint is skipped because requested "
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"instance RAM size is 0 or invalid."))
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return constraint_matrix
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for i in xrange(num_hosts):
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if requested_ram == hosts[i].free_ram_mb:
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constraint_matrix[i] = (
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[True] + [False for j in xrange(num_instances - 1)])
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else:
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constraint_matrix[i] = [False for j in xrange(num_instances)]
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LOG.debug("%(host)s does not have exactly %(requested_ram)s MB"
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"RAM, it has %(usable_ram)s MB RAM.",
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{'host': hosts[i],
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'requested_ram': requested_ram,
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'usable_ram': hosts[i].free_ram_mb})
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return constraint_matrix
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