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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !plan9
// The stress utility is intended for catching sporadic failures.
// It runs a given process in parallel in a loop and collects any failures.
// Usage:
// $ stress ./fmt.test -test.run=TestSometing -test.cpu=10
// You can also specify a number of parallel processes with -p flag;
// instruct the utility to not kill hanged processes for gdb attach;
// or specify the failure output you are looking for (if you want to
// ignore some other sporadic failures).
package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"syscall"
"time"
)
var (
flagP = flag.Int("p", runtime.NumCPU(), "run `N` processes in parallel")
flagTimeout = flag.Duration("timeout", 10*time.Minute, "timeout each process after `duration`")
flagKill = flag.Bool("kill", true, "kill timed out processes if true, otherwise just print pid (to attach with gdb)")
flagFailure = flag.String("failure", "", "fail only if output matches `regexp`")
flagIgnore = flag.String("ignore", "", "ignore failure if output matches `regexp`")
flagOutput = flag.String("o", defaultPrefix(), "output failure logs to `path` plus a unique suffix")
)
func init() {
flag.Usage = func() {
os.Stderr.WriteString(`The stress utility is intended for catching sporadic failures.
It runs a given process in parallel in a loop and collects any failures.
Usage:
$ stress ./fmt.test -test.run=TestSometing -test.cpu=10
`)
flag.PrintDefaults()
}
}
func defaultPrefix() string {
date := time.Now().Format("go-stress-20060102T150405-")
return filepath.Join(os.TempDir(), date)
}
func main() {
flag.Parse()
if *flagP <= 0 || *flagTimeout <= 0 || len(flag.Args()) == 0 {
flag.Usage()
os.Exit(1)
}
var failureRe, ignoreRe *regexp.Regexp
if *flagFailure != "" {
var err error
if failureRe, err = regexp.Compile(*flagFailure); err != nil {
fmt.Println("bad failure regexp:", err)
os.Exit(1)
}
}
if *flagIgnore != "" {
var err error
if ignoreRe, err = regexp.Compile(*flagIgnore); err != nil {
fmt.Println("bad ignore regexp:", err)
os.Exit(1)
}
}
res := make(chan []byte)
for i := 0; i < *flagP; i++ {
go func() {
for {
cmd := exec.Command(flag.Args()[0], flag.Args()[1:]...)
done := make(chan bool)
if *flagTimeout > 0 {
go func() {
select {
case <-done:
return
case <-time.After(*flagTimeout):
}
if !*flagKill {
fmt.Printf("process %v timed out\n", cmd.Process.Pid)
return
}
cmd.Process.Signal(syscall.SIGABRT)
select {
case <-done:
return
case <-time.After(10 * time.Second):
}
cmd.Process.Kill()
}()
}
out, err := cmd.CombinedOutput()
close(done)
if err != nil && (failureRe == nil || failureRe.Match(out)) && (ignoreRe == nil || !ignoreRe.Match(out)) {
out = append(out, fmt.Sprintf("\n\nERROR: %v\n", err)...)
} else {
out = []byte{}
}
res <- out
}
}()
}
runs, fails := 0, 0
ticker := time.NewTicker(5 * time.Second).C
for {
select {
case out := <-res:
runs++
if len(out) == 0 {
continue
}
fails++
dir, path := filepath.Split(*flagOutput)
f, err := ioutil.TempFile(dir, path)
if err != nil {
fmt.Printf("failed to create temp file: %v\n", err)
os.Exit(1)
}
f.Write(out)
f.Close()
if len(out) > 2<<10 {
out = out[:2<<10]
}
fmt.Printf("\n%s\n%s\n", f.Name(), out)
case <-ticker:
fmt.Printf("%v runs so far, %v failures\n", runs, fails)
}
}
}
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