case "runtime._System", "runtime._GC", "runtime._ExternalCode", "runtime._VDSO":
				continue
			}
			stack := strings.Join(fns, "|")
			samples := int(s.Value[0])
			pprofStacks[stack] += samples
		}
	}
	for stack, samples := range pprofStacks {
		fmt.Fprintf(os.Stderr, "%s\t%d\n", stack, samples)
	}
}

func cpuHogger(f func(x int) int, y *int, dur time.Duration) {