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      1 // run
      2 
      3 // Copyright 2014 The Go Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style
      5 // license that can be found in the LICENSE file.
      6 
      7 package main
      8 
      9 import (
     10 	"bytes"
     11 	"runtime"
     12 	"runtime/pprof"
     13 	"sync"
     14 )
     15 
     16 func test() {
     17 	var wg sync.WaitGroup
     18 	wg.Add(2)
     19 	test := func() {
     20 		for i := 0; i < 10; i++ {
     21 			buf := &bytes.Buffer{}
     22 			pprof.Lookup("goroutine").WriteTo(buf, 2)
     23 		}
     24 		wg.Done()
     25 	}
     26 
     27 	go test()
     28 	go test()
     29 	wg.Wait()
     30 }
     31 
     32 func main() {
     33 	runtime.GOMAXPROCS(4)
     34 	for i := 0; i < 10; i++ {
     35 		test()
     36 	}
     37 }
     38