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66 lines
2.2 KiB
Go
66 lines
2.2 KiB
Go
/*
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Copyright 2019 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 noderesources
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import (
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"k8s.io/kubernetes/pkg/scheduler/apis/config"
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"k8s.io/kubernetes/pkg/scheduler/framework"
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)
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// mostResourceScorer 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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//
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// Details:
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// (cpu(MaxNodeScore * requested * cpuWeight / capacity) + memory(MaxNodeScore * requested * memoryWeight / capacity) + ...) / weightSum
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func mostResourceScorer(resources []config.ResourceSpec) func(requested, allocable []int64) int64 {
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return func(requested, allocable []int64) int64 {
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var nodeScore, weightSum int64
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for i := range requested {
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if allocable[i] == 0 {
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continue
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}
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weight := resources[i].Weight
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resourceScore := mostRequestedScore(requested[i], allocable[i])
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nodeScore += resourceScore * weight
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weightSum += weight
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}
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if weightSum == 0 {
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return 0
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}
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return nodeScore / weightSum
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}
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}
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// The used capacity is calculated on a scale of 0-MaxNodeScore (MaxNodeScore is
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// constant with value set to 100).
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// 0 being the lowest priority and 100 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 noderesources.leastRequestedScore.
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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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// `requested` might be greater than `capacity` because pods with no
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// requests get minimum values.
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requested = capacity
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}
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return (requested * framework.MaxNodeScore) / capacity
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}
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