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60 lines
2.3 KiB
Go
60 lines
2.3 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package priorities
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import framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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var (
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mostRequestedRatioResources = DefaultRequestedRatioResources
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mostResourcePriority = &ResourceAllocationPriority{"MostResourceAllocation", mostResourceScorer, mostRequestedRatioResources}
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// MostRequestedPriorityMap is a priority function that favors nodes with most requested resources.
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// It calculates the percentage of memory and CPU requested by pods scheduled on the node, and prioritizes
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// based on the maximum of the average of the fraction of requested to capacity.
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// Details: (cpu(10 * sum(requested) / capacity) + memory(10 * sum(requested) / capacity)) / 2
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MostRequestedPriorityMap = mostResourcePriority.PriorityMap
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)
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func mostResourceScorer(requested, allocable ResourceToValueMap, includeVolumes bool, requestedVolumes int, allocatableVolumes int) int64 {
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var nodeScore, weightSum int64
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for resource, weight := range mostRequestedRatioResources {
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resourceScore := mostRequestedScore(requested[resource], allocable[resource])
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nodeScore += resourceScore * weight
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weightSum += weight
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}
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return (nodeScore / weightSum)
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}
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// The used capacity is calculated on a scale of 0-10
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// 0 being the lowest priority and 10 being the highest.
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// The more resources are used the higher the score is. This function
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// is almost a reversed version of least_requested_priority.calculateUnusedScore
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// (10 - calculateUnusedScore). The main difference is in rounding. It was added to
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// keep the final formula clean and not to modify the widely used (by users
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// in their default scheduling policies) calculateUsedScore.
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func mostRequestedScore(requested, capacity int64) int64 {
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if capacity == 0 {
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return 0
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}
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if requested > capacity {
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return 0
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}
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return (requested * framework.MaxNodeScore) / capacity
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}
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