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cmd/stress: flush out Usage doc
Provide more context when you run `stress -h` besides just the flags. Change-Id: I9dbe7ba2b7178dd7a542d8c4c29bf79999a38234 Reviewed-on: https://go-review.googlesource.com/44810 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -4,14 +4,14 @@
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// +build !plan9
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// +build !plan9
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// The stress utility is intended for catching of episodic failures.
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// The stress utility is intended for catching sporadic failures.
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// It runs a given process in parallel in a loop and collects any failures.
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// It runs a given process in parallel in a loop and collects any failures.
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// Usage:
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// Usage:
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// $ stress ./fmt.test -test.run=TestSometing -test.cpu=10
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// $ stress ./fmt.test -test.run=TestSometing -test.cpu=10
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// You can also specify a number of parallel processes with -p flag;
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// You can also specify a number of parallel processes with -p flag;
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// instruct the utility to not kill hanged processes for gdb attach;
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// instruct the utility to not kill hanged processes for gdb attach;
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// or specify the failure output you are looking for (if you want to
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// or specify the failure output you are looking for (if you want to
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// ignore some other episodic failures).
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// ignore some other sporadic failures).
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package main
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package main
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import (
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import (
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@ -34,6 +34,19 @@ var (
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flagIgnore = flag.String("ignore", "", "ignore failure if output matches `regexp`")
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flagIgnore = flag.String("ignore", "", "ignore failure if output matches `regexp`")
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)
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)
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func init() {
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flag.Usage = func() {
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os.Stderr.WriteString(`The stress utility is intended for catching sporadic failures.
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It runs a given process in parallel in a loop and collects any failures.
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Usage:
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$ stress ./fmt.test -test.run=TestSometing -test.cpu=10
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`)
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flag.PrintDefaults()
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}
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}
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func main() {
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func main() {
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flag.Parse()
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flag.Parse()
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if *flagP <= 0 || *flagTimeout <= 0 || len(flag.Args()) == 0 {
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if *flagP <= 0 || *flagTimeout <= 0 || len(flag.Args()) == 0 {
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