103 lines
3.1 KiB
Go
103 lines
3.1 KiB
Go
/*
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Copyright 2017 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 cache
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import (
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"fmt"
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"math/rand"
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"testing"
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"time"
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"github.com/google/uuid"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/utils/clock"
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)
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func TestSimpleCache(t *testing.T) {
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testCache(newSimpleCache(clock.RealClock{}), t)
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}
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// Note: the performance profile of this benchmark may not match that in the production.
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// When making change to SimpleCache, run test with and without concurrency to better understand the impact.
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// This is a tool to test and measure high concurrency of the cache in isolation and not to the Kubernetes usage of the Cache.
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func BenchmarkCacheContentions(b *testing.B) {
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for _, numKeys := range []int{1 << 8, 1 << 12, 1 << 16} {
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b.Run(fmt.Sprintf("Simple/keys=%d", numKeys), func(b *testing.B) {
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benchmarkCache(newSimpleCache(clock.RealClock{}), b, numKeys)
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})
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b.Run(fmt.Sprintf("Striped/keys=%d", numKeys), func(b *testing.B) {
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benchmarkCache(newStripedCache(32, fnvHashFunc, func() cache { return newSimpleCache(clock.RealClock{}) }), b, numKeys)
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})
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}
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}
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func TestStripedCache(t *testing.T) {
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testCache(newStripedCache(32, fnvHashFunc, func() cache { return newSimpleCache(clock.RealClock{}) }), t)
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}
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func benchmarkCache(cache cache, b *testing.B, numKeys int) {
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keys := []string{}
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for i := 0; i < numKeys; i++ {
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key := uuid.New().String()
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keys = append(keys, key)
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}
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b.ResetTimer()
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b.SetParallelism(500)
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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key := keys[rand.Intn(numKeys)]
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_, ok := cache.get(key)
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if ok {
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cache.remove(key)
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} else {
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cache.set(key, &cacheRecord{}, time.Second)
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}
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}
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})
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}
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func testCache(cache cache, t *testing.T) {
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if result, ok := cache.get("foo"); ok || result != nil {
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t.Errorf("Expected null, false, got %#v, %v", result, ok)
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}
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record1 := &cacheRecord{resp: &authenticator.Response{User: &user.DefaultInfo{Name: "bob"}}}
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record2 := &cacheRecord{resp: &authenticator.Response{User: &user.DefaultInfo{Name: "alice"}}}
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// when empty, record is stored
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cache.set("foo", record1, time.Hour)
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if result, ok := cache.get("foo"); !ok || result != record1 {
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t.Errorf("Expected %#v, true, got %#v, %v", record1, result, ok)
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}
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// newer record overrides
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cache.set("foo", record2, time.Hour)
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if result, ok := cache.get("foo"); !ok || result != record2 {
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t.Errorf("Expected %#v, true, got %#v, %v", record2, result, ok)
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}
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// removing the current value removes
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cache.remove("foo")
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if result, ok := cache.get("foo"); ok || result != nil {
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t.Errorf("Expected null, false, got %#v, %v", result, ok)
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}
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}
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