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