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62 lines
2.0 KiB
Go
62 lines
2.0 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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// leastResourceScorer favors nodes with fewer requested resources.
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// It calculates the percentage of memory, CPU and other resources requested by pods scheduled on the node, and
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// prioritizes based on the minimum of the average of the fraction of requested to capacity.
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//
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// Details:
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// (cpu((capacity-requested)*MaxNodeScore*cpuWeight/capacity) + memory((capacity-requested)*MaxNodeScore*memoryWeight/capacity) + ...)/weightSum
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func leastResourceScorer(resources []config.ResourceSpec) func([]int64, []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 := leastRequestedScore(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 unused capacity is calculated on a scale of 0-MaxNodeScore
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// 0 being the lowest priority and `MaxNodeScore` being the highest.
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// The more unused resources the higher the score is.
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func leastRequestedScore(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 ((capacity - requested) * framework.MaxNodeScore) / capacity
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}
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