// User input flags
	searchText           string
	goTime, less, margin time.Duration
)

func init() {
	flag.DurationVar(&less, "less", 0, "goroutine waiting less than the specified time")
	flag.DurationVar(&goTime, "time", 0, "goroutine waiting for exactly the specified time")
	flag.DurationVar(&margin, "margin", 0, "margin time")