main.go

package main

import (
	"fmt"
	"os"
	"runtime/pprof"
	"time"
)

func main() {
	duration := time.After(45 * time.Second)
	abort := make(chan bool)
	aborted := make(chan bool)
	go profile(abort, aborted)
	go dummyWork()
	<-duration
	abort <- true
	<-aborted
	println("complete")
}

func profile(abort chan bool, aborted chan bool) error {
	var f *os.File
	var err error

	ticker := time.Tick(5 * time.Second)
	for {
		select {
		case <-ticker:
			fmt.Printf("f: %#v\n", f)
			if f != nil {
				println("timeout")
				pprof.StopCPUProfile()
				f.Close()
				println("timeout complete")
			}
			println("tick")
			f, err = os.Create(fmt.Sprintf("cpuprofile_%d", time.Now().Unix()))
			if err != nil {
				return err
			}
			println("start profile")
			if err := pprof.StartCPUProfile(f); err != nil {
				return err
			}
			println("tick complete")
			continue
		case <-abort:
			aborted <- true
			return nil
		}
	}
	return nil
}

func dummyWork() {
	if fib(99) < 1 {
		panic("wat")
	}
}

func fib(n int) int {
	if n < 2 {
		return 1
	}
	return fib(n-1) + fib(n-2)
}