mirror of
https://github.com/restic/restic.git
synced 2024-12-29 03:06:01 +00:00
100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
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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 main
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import (
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"bytes"
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"cloud.google.com/go/profiler"
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"compress/gzip"
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"flag"
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"log"
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"math/rand"
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"sync"
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"time"
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)
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var (
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service = flag.String("service", "", "service name")
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mutexProfiling = flag.Bool("mutex_profiling", false, "enable mutex profiling")
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)
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const duration = time.Minute * 10
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// busywork continuously generates 1MiB of random data and compresses it
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// throwing away the result.
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func busywork(mu *sync.Mutex) {
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ticker := time.NewTicker(duration)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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return
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default:
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mu.Lock()
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busyworkOnce()
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mu.Unlock()
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}
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}
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}
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func busyworkOnce() {
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data := make([]byte, 1024*1024)
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rand.Read(data)
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var b bytes.Buffer
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gz := gzip.NewWriter(&b)
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if _, err := gz.Write(data); err != nil {
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log.Printf("Failed to write to gzip stream: %v", err)
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return
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}
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if err := gz.Flush(); err != nil {
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log.Printf("Failed to flush to gzip stream: %v", err)
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return
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}
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if err := gz.Close(); err != nil {
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log.Printf("Failed to close gzip stream: %v", err)
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}
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// Throw away the result.
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}
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func main() {
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flag.Parse()
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if *service == "" {
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log.Print("Service name must be configured using --service flag.")
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} else if err := profiler.Start(
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profiler.Config{
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Service: *service,
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MutexProfiling: *mutexProfiling,
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DebugLogging: true,
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}); err != nil {
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log.Printf("Failed to start the profiler: %v", err)
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} else {
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mu := new(sync.Mutex)
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var wg sync.WaitGroup
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wg.Add(5)
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for i := 0; i < 5; i++ {
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go func() {
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defer wg.Done()
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busywork(mu)
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}()
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}
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wg.Wait()
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}
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log.Printf("busybench finished profiling.")
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// Do not exit, since the pod in the GKE test is set to always restart.
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select {}
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}
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