embedded-5_0-branch/gcc/testsuite/go.test/test/stress/runstress.go

   1 // Copyright 2013 The Go Authors.  All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // The runstress tool stresses the runtime.
   6 //
   7 // It runs forever and should never fail. It tries to stress the garbage collector,
   8 // maps, channels, the network, and everything else provided by the runtime.
   9 package main
  10
  11 import (
  12         "flag"
  13         "fmt"
  14         "io"
  15         "io/ioutil"
  16         "log"
  17         "math/rand"
  18         "net"
  19         "net/http"
  20         "net/http/httptest"
  21         "os/exec"
  22         "strconv"
  23         "time"
  24 )
  25
  26 var (
  27         v         = flag.Bool("v", false, "verbose")
  28         doMaps    = flag.Bool("maps", true, "stress maps")
  29         doExec    = flag.Bool("exec", true, "stress exec")
  30         doChan    = flag.Bool("chan", true, "stress channels")
  31         doNet     = flag.Bool("net", true, "stress networking")
  32         doParseGo = flag.Bool("parsego", true, "stress parsing Go (generates garbage)")
  33 )
  34
  35 func Println(a ...interface{}) {
  36         if *v {
  37                 log.Println(a...)
  38         }
  39 }
  40
  41 func dialStress(a net.Addr) {
  42         for {
  43                 d := net.Dialer{Timeout: time.Duration(rand.Intn(1e9))}
  44                 c, err := d.Dial("tcp", a.String())
  45                 if err == nil {
  46                         Println("did dial")
  47                         go func() {
  48                                 time.Sleep(time.Duration(rand.Intn(500)) * time.Millisecond)
  49                                 c.Close()
  50                                 Println("closed dial")
  51                         }()
  52                 }
  53                 // Don't run out of ephermeral ports too quickly:
  54                 time.Sleep(250 * time.Millisecond)
  55         }
  56 }
  57
  58 func stressNet() {
  59         ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
  60                 size, _ := strconv.Atoi(r.FormValue("size"))
  61                 w.Write(make([]byte, size))
  62         }))
  63         go dialStress(ts.Listener.Addr())
  64         for {
  65                 size := rand.Intn(128 << 10)
  66                 res, err := http.Get(fmt.Sprintf("%s/?size=%d", ts.URL, size))
  67                 if err != nil {
  68                         log.Fatalf("stressNet: http Get error: %v", err)
  69                 }
  70                 if res.StatusCode != 200 {
  71                         log.Fatalf("stressNet: Status code = %d", res.StatusCode)
  72                 }
  73                 n, err := io.Copy(ioutil.Discard, res.Body)
  74                 if err != nil {
  75                         log.Fatalf("stressNet: io.Copy: %v", err)
  76                 }
  77                 if n != int64(size) {
  78                         log.Fatalf("stressNet: copied = %d; want %d", n, size)
  79                 }
  80                 res.Body.Close()
  81                 Println("did http", size)
  82         }
  83 }
  84
  85 func doAnExec() {
  86         exit := rand.Intn(2)
  87         wantOutput := fmt.Sprintf("output-%d", rand.Intn(1e9))
  88         cmd := exec.Command("/bin/sh", "-c", fmt.Sprintf("echo %s; exit %d", wantOutput, exit))
  89         out, err := cmd.CombinedOutput()
  90         if exit == 1 {
  91                 if err == nil {
  92                         log.Fatal("stressExec: unexpected exec success")
  93                 }
  94                 return
  95         }
  96         if err != nil {
  97                 log.Fatalf("stressExec: exec failure: %v: %s", err, out)
  98         }
  99         wantOutput += "\n"
 100         if string(out) != wantOutput {
 101                 log.Fatalf("stressExec: exec output = %q; want %q", out, wantOutput)
 102         }
 103         Println("did exec")
 104 }
 105
 106 func stressExec() {
 107         gate := make(chan bool, 10) // max execs at once
 108         for {
 109                 gate <- true
 110                 go func() {
 111                         doAnExec()
 112                         <-gate
 113                 }()
 114         }
 115 }
 116
 117 func ringf(in <-chan int, out chan<- int, donec chan bool) {
 118         for {
 119                 var n int
 120                 select {
 121                 case <-donec:
 122                         return
 123                 case n = <-in:
 124                 }
 125                 if n == 0 {
 126                         close(donec)
 127                         return
 128                 }
 129                 out <- n - 1
 130         }
 131 }
 132
 133 func threadRing(bufsize int) {
 134         const N = 100
 135         donec := make(chan bool)
 136         one := make(chan int, bufsize) // will be input to thread 1
 137         var in, out chan int = nil, one
 138         for i := 1; i <= N-1; i++ {
 139                 in, out = out, make(chan int, bufsize)
 140                 go ringf(in, out, donec)
 141         }
 142         go ringf(out, one, donec)
 143         one <- N
 144         <-donec
 145         Println("did threadring of", bufsize)
 146 }
 147
 148 func stressChannels() {
 149         for {
 150                 threadRing(0)
 151                 threadRing(1)
 152         }
 153 }
 154
 155 func main() {
 156         flag.Parse()
 157         for want, f := range map[*bool]func(){
 158                 doMaps:    stressMaps,
 159                 doNet:     stressNet,
 160                 doExec:    stressExec,
 161                 doChan:    stressChannels,
 162                 doParseGo: stressParseGo,
 163         } {
 164                 if *want {
 165                         go f()
 166                 }
 167         }
 168         select {}
 169 }