| // Copyright 2017 Google LLC |
| // |
| // 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. |
| |
| // Busybench is a tool that runs a benchmark with the profiler enabled. |
| package main |
| |
| import ( |
| "bytes" |
| "compress/gzip" |
| "flag" |
| "log" |
| "math/rand" |
| "runtime" |
| "sync" |
| "time" |
| |
| "cloud.google.com/go/profiler" |
| ) |
| |
| var ( |
| service = flag.String("service", "", "service name") |
| serviceVersion = flag.String("service_version", "1.0.0", "service version") |
| mutexProfiling = flag.Bool("mutex_profiling", false, "enable mutex profiling") |
| duration = flag.Int("duration", 200, "duration of the benchmark in seconds") |
| apiAddr = flag.String("api_address", "", "API address of the profiler (e.g. 'cloudprofiler.googleapis.com:443')") |
| projectID = flag.String("project_id", "", "cloud project ID") |
| ) |
| |
| // busywork continuously generates 1MiB of random data and compresses it |
| // throwing away the result. |
| func busywork(mu *sync.Mutex) { |
| start := time.Now() |
| dur := time.Duration(*duration) * time.Second |
| for time.Since(start) < dur || dur == 0 { |
| busyworkOnce(mu) |
| } |
| } |
| |
| func busyworkOnce(mu *sync.Mutex) { |
| data := make([]byte, 128*1024) |
| rand.Read(data) |
| |
| // Grab the mutex after the allocation above is done so that |
| // there are a number of outstanding allocations. This makes |
| // the live heap profiles consistently non-empty. |
| mu.Lock() |
| defer mu.Unlock() |
| 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() |
| log.Printf("busybench using %s.", runtime.Version()) |
| defer log.Printf("busybench finished profiling.") |
| |
| if *service == "" { |
| log.Print("Service name must be configured using --service flag.") |
| return |
| } |
| if err := profiler.Start(profiler.Config{Service: *service, |
| MutexProfiling: *mutexProfiling, |
| ServiceVersion: *serviceVersion, |
| DebugLogging: true, |
| APIAddr: *apiAddr, |
| ProjectID: *projectID}); err != nil { |
| log.Printf("Failed to start the profiler: %v", err) |
| return |
| } |
| |
| var mu sync.Mutex |
| var wg sync.WaitGroup |
| const numBusyworkers = 20 |
| wg.Add(numBusyworkers) |
| runtime.GOMAXPROCS(numBusyworkers) |
| |
| for i := 0; i < numBusyworkers; i++ { |
| go func() { |
| defer wg.Done() |
| busywork(&mu) |
| }() |
| } |
| wg.Wait() |
| } |