Go调试利器

package main

import (
	"os/signal"
	"os"
	"syscall"
	"fmt"
	"runtime"
	"time"
)

// kill -SIGUSR1 pid
func main() {
	time.Sleep(time.Hour)
}

func dumpStacks() {
	buf := make([]byte, 16384)
	buf = buf[:runtime.Stack(buf, true)]
	fmt.Printf("=== BEGIN goroutine stack dump ===\n%s\n=== END goroutine stack dump ===", buf)
}

func setupSigusr1Trap() {
	c := make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGUSR1)
	go func() {
		for range c {
			dumpStacks()
		}
	}()
}

func init() {
	setupSigusr1Trap()
}

go调试小技巧，源码出自docker源码

通过命令发送指定信号即可打印出线程堆栈信息