80 lines
3.1 KiB
Python
80 lines
3.1 KiB
Python
# Copyright (c) 2014 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_config import cfg
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from oslo_log import log as logging
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from nova.i18n import _
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from nova_solverscheduler.scheduler.solvers import constraints
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CONF = cfg.CONF
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CONF.import_opt('cpu_allocation_ratio', 'nova.scheduler.filters.core_filter')
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LOG = logging.getLogger(__name__)
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class VcpuConstraint(constraints.BaseLinearConstraint):
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"""Constraint of the total vcpu demand acceptable on each host."""
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def _get_cpu_allocation_ratio(self, host_state, filter_properties):
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return CONF.cpu_allocation_ratio
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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 vcpus
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instance_type = filter_properties.get('instance_type') or {}
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if not instance_type:
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return constraint_matrix
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else:
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instance_vcpus = instance_type['vcpus']
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if instance_vcpus <= 0:
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LOG.warn(_("VcpuConstraint is skipped because requested "
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"instance vCPU number 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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cpu_allocation_ratio = self._get_cpu_allocation_ratio(
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hosts[i], filter_properties)
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# get available vcpus
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if not hosts[i].vcpus_total:
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LOG.warn(_("vCPUs of %(host)s not set; assuming CPU "
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"collection broken."), {'host': hosts[i]})
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continue
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else:
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vcpus_total = hosts[i].vcpus_total * cpu_allocation_ratio
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usable_vcpus = vcpus_total - hosts[i].vcpus_used
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acceptable_num_instances = int(usable_vcpus / instance_vcpus)
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if acceptable_num_instances < num_instances:
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inacceptable_num = num_instances - acceptable_num_instances
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constraint_matrix[i] = (
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[True for j in xrange(acceptable_num_instances)] +
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[False for j in xrange(inacceptable_num)])
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LOG.debug(_("%(host)s can accept %(num)s requested instances "
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"according to VcpuConstraint."),
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{'host': hosts[i],
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'num': acceptable_num_instances})
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if vcpus_total > 0:
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hosts[i].limits['vcpu'] = vcpus_total
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return constraint_matrix
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