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https://github.com/etcd-io/etcd.git
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deb1da5f57
One watcher includes multiple watchings, and their events are sent out through one channel. For the received event, user would like to know which watching it belongs to. Introduce a watch ID. When watching on some key, user will get a watch ID. The watch ID is attached to all events that is observed by this watch.
120 lines
3.4 KiB
Go
120 lines
3.4 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package storage
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import (
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"math/rand"
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"os"
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"testing"
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)
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// Benchmarks on cancel function performance for unsynced watchers
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// in a WatchableStore. It creates k*N watchers to populate unsynced
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// with a reasonably large number of watchers. And measures the time it
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// takes to cancel N watchers out of k*N watchers. The performance is
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// expected to differ depending on the unsynced member implementation.
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// TODO: k is an arbitrary constant. We need to figure out what factor
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// we should put to simulate the real-world use cases.
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func BenchmarkWatchableStoreUnsyncedCancel(b *testing.B) {
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const k int = 2
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benchSampleSize := b.N
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watcherSize := k * benchSampleSize
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// manually create watchableStore instead of newWatchableStore
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// because newWatchableStore periodically calls syncWatchersLoop
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// method to sync watchers in unsynced map. We want to keep watchers
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// in unsynced for this benchmark.
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s := &watchableStore{
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store: newStore(tmpPath),
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unsynced: make(map[*watching]struct{}),
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// For previous implementation, use:
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// unsynced: make([]*watching, 0),
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// to make the test not crash from assigning to nil map.
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// 'synced' doesn't get populated in this test.
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synced: make(map[string]map[*watching]struct{}),
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}
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defer func() {
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s.store.Close()
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os.Remove(tmpPath)
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}()
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// Put a key so that we can spawn watchers on that key
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// (testKey in this test). This increases the rev to 1,
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// and later we can we set the watcher's startRev to 1,
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// and force watchers to be in unsynced.
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testKey := []byte("foo")
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testValue := []byte("bar")
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s.Put(testKey, testValue)
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w := s.NewWatcher()
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cancels := make([]CancelFunc, watcherSize)
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for i := 0; i < watcherSize; i++ {
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// non-0 value to keep watchers in unsynced
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_, cancel := w.Watch(testKey, true, 1)
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cancels[i] = cancel
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}
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// random-cancel N watchers to make it not biased towards
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// data structures with an order, such as slice.
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ix := rand.Perm(watcherSize)
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b.ResetTimer()
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b.ReportAllocs()
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// cancel N watchers
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for _, idx := range ix[:benchSampleSize] {
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cancels[idx]()
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}
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}
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func BenchmarkWatchableStoreSyncedCancel(b *testing.B) {
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s := newWatchableStore(tmpPath)
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defer func() {
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s.store.Close()
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os.Remove(tmpPath)
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}()
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// Put a key so that we can spawn watchers on that key
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testKey := []byte("foo")
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testValue := []byte("bar")
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s.Put(testKey, testValue)
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w := s.NewWatcher()
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// put 1 million watchers on the same key
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const watcherSize = 1000000
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cancels := make([]CancelFunc, watcherSize)
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for i := 0; i < watcherSize; i++ {
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// 0 for startRev to keep watchers in synced
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_, cancel := w.Watch(testKey, true, 0)
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cancels[i] = cancel
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}
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// randomly cancel watchers to make it not biased towards
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// data structures with an order, such as slice.
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ix := rand.Perm(watcherSize)
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b.ResetTimer()
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b.ReportAllocs()
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for _, idx := range ix {
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cancels[idx]()
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}
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}
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