62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package noderesources
|
|
|
|
import (
|
|
"k8s.io/kubernetes/pkg/scheduler/framework"
|
|
)
|
|
|
|
// mostResourceScorer favors nodes with most requested resources.
|
|
// It calculates the percentage of memory and CPU requested by pods scheduled on the node, and prioritizes
|
|
// based on the maximum of the average of the fraction of requested to capacity.
|
|
//
|
|
// Details:
|
|
// (cpu(MaxNodeScore * sum(requested) / capacity) + memory(MaxNodeScore * sum(requested) / capacity)) / weightSum
|
|
func mostResourceScorer(resToWeightMap resourceToWeightMap) func(requested, allocable resourceToValueMap) int64 {
|
|
return func(requested, allocable resourceToValueMap) int64 {
|
|
var nodeScore, weightSum int64
|
|
for resource := range requested {
|
|
weight := resToWeightMap[resource]
|
|
resourceScore := mostRequestedScore(requested[resource], allocable[resource])
|
|
nodeScore += resourceScore * weight
|
|
weightSum += weight
|
|
}
|
|
if weightSum == 0 {
|
|
return 0
|
|
}
|
|
return nodeScore / weightSum
|
|
}
|
|
}
|
|
|
|
// The used capacity is calculated on a scale of 0-MaxNodeScore (MaxNodeScore is
|
|
// constant with value set to 100).
|
|
// 0 being the lowest priority and 100 being the highest.
|
|
// The more resources are used the higher the score is. This function
|
|
// is almost a reversed version of noderesources.leastRequestedScore.
|
|
func mostRequestedScore(requested, capacity int64) int64 {
|
|
if capacity == 0 {
|
|
return 0
|
|
}
|
|
if requested > capacity {
|
|
// `requested` might be greater than `capacity` because pods with no
|
|
// requests get minimum values.
|
|
requested = capacity
|
|
}
|
|
|
|
return (requested * framework.MaxNodeScore) / capacity
|
|
}
|