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