30b89d830b
This moves plugin/pkg/scheduler to pkg/scheduler and plugin/cmd/kube-scheduler to cmd/kube-scheduler. Bulk of the work was done with gomvpkg, except for kube-scheduler main package.
62 lines
2.4 KiB
Go
62 lines
2.4 KiB
Go
/*
|
|
Copyright 2016 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 priorities
|
|
|
|
import (
|
|
"math"
|
|
|
|
schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
|
|
"k8s.io/kubernetes/pkg/scheduler/schedulercache"
|
|
)
|
|
|
|
var (
|
|
balanceResourcePriority = &ResourceAllocationPriority{"BalanceResourceAllocation", balancedResourceScorer}
|
|
|
|
// BalancedResourceAllocationMap favors nodes with balanced resource usage rate.
|
|
// BalancedResourceAllocationMap should **NOT** be used alone, and **MUST** be used together
|
|
// with LeastRequestedPriority. It calculates the difference between the cpu and memory fraction
|
|
// of capacity, and prioritizes the host based on how close the two metrics are to each other.
|
|
// Detail: score = 10 - abs(cpuFraction-memoryFraction)*10. The algorithm is partly inspired by:
|
|
// "Wei Huang et al. An Energy Efficient Virtual Machine Placement Algorithm with Balanced
|
|
// Resource Utilization"
|
|
BalancedResourceAllocationMap = balanceResourcePriority.PriorityMap
|
|
)
|
|
|
|
func balancedResourceScorer(requested, allocable *schedulercache.Resource) int64 {
|
|
cpuFraction := fractionOfCapacity(requested.MilliCPU, allocable.MilliCPU)
|
|
memoryFraction := fractionOfCapacity(requested.Memory, allocable.Memory)
|
|
|
|
if cpuFraction >= 1 || memoryFraction >= 1 {
|
|
// if requested >= capacity, the corresponding host should never be preferred.
|
|
return 0
|
|
}
|
|
|
|
// Upper and lower boundary of difference between cpuFraction and memoryFraction are -1 and 1
|
|
// respectively. Multilying the absolute value of the difference by 10 scales the value to
|
|
// 0-10 with 0 representing well balanced allocation and 10 poorly balanced. Subtracting it from
|
|
// 10 leads to the score which also scales from 0 to 10 while 10 representing well balanced.
|
|
diff := math.Abs(cpuFraction - memoryFraction)
|
|
return int64((1 - diff) * float64(schedulerapi.MaxPriority))
|
|
}
|
|
|
|
func fractionOfCapacity(requested, capacity int64) float64 {
|
|
if capacity == 0 {
|
|
return 1
|
|
}
|
|
return float64(requested) / float64(capacity)
|
|
}
|