mirror of https://github.com/k3s-io/k3s
52 lines
2.0 KiB
Go
52 lines
2.0 KiB
Go
/*
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Copyright 2014 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 cachesize
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import (
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"k8s.io/apimachinery/pkg/runtime/schema"
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)
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// NewHeuristicWatchCacheSizes returns a map of suggested watch cache sizes based on total
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// memory.
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func NewHeuristicWatchCacheSizes(expectedRAMCapacityMB int) map[schema.GroupResource]int {
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// From our documentation, we officially recommend 120GB machines for
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// 2000 nodes, and we scale from that point. Thus we assume ~60MB of
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// capacity per node.
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// TODO: Revisit this heuristics
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clusterSize := expectedRAMCapacityMB / 60
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// We should specify cache size for a given resource only if it
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// is supposed to have non-default value.
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//
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// TODO: Figure out which resource we should have non-default value.
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watchCacheSizes := make(map[schema.GroupResource]int)
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watchCacheSizes[schema.GroupResource{Resource: "replicationcontrollers"}] = maxInt(5*clusterSize, 100)
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watchCacheSizes[schema.GroupResource{Resource: "endpoints"}] = maxInt(10*clusterSize, 1000)
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watchCacheSizes[schema.GroupResource{Resource: "nodes"}] = maxInt(5*clusterSize, 1000)
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watchCacheSizes[schema.GroupResource{Resource: "pods"}] = maxInt(50*clusterSize, 1000)
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watchCacheSizes[schema.GroupResource{Resource: "services"}] = maxInt(5*clusterSize, 1000)
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watchCacheSizes[schema.GroupResource{Resource: "apiservices", Group: "apiregistration.k8s.io"}] = maxInt(5*clusterSize, 1000)
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return watchCacheSizes
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}
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func maxInt(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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