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package main
import ("fmt"; "time"; "runtime"; "container/list"; "sync")
func main() {
	numSkipItems := int(1e4)
	numItems := int(1e4)
	s32h(numSkipItems, false)
	runtime.GC()
	s32h(numItems, true)
	time.Sleep(5e9)
}

func s32h(numItems int, out bool) {
	now, now2, ok, chsz := int64(0), int64(0), true, 2
	_ = ok
	fnOut := func(s string) {
		if out { fmt.Printf("Op: %+20v: %+12v ns\n", s, now2-now) }
	}
	
	now = time.Nanoseconds()
	for i := 0; i < numItems; i++ {
		m := make([]int, 2)
		m[0] = 1
	}
	now2 = time.Nanoseconds()
	fnOut("slice")

now = time.Nanoseconds()
	for i := 0; i < numItems; i++ {
		m := list.New()
		m.PushFront(1)
		_ = m
	}
	now2 = time.Nanoseconds()
	fnOut("list")

now = time.Nanoseconds()
	for i := 0; i < numItems; i++ {
		ch := make(chan int, chsz)
		close(ch)
	}
	now2 = time.Nanoseconds()
	fnOut("channel-create")

now = time.Nanoseconds()
	for i := 0; i < numItems; i++ {
		ch := make(chan int, chsz)
		for j := 0; j < chsz; j++ { ch <- 1 }
		close(ch)
		for j := range ch { _ = j } //{ print("ch close: ", j) } //
		//ch <- 1; <- ch
	}
	now2 = time.Nanoseconds()
	fnOut("channel+send/recv")

now = time.Nanoseconds()
	for i := 0; i < numItems; i++ {
		m := make(map[int]int, 2)
		m[1] = 2
		_, ok = m[0]
	}
	now2 = time.Nanoseconds()
	fnOut("map")	
	
	now = time.Nanoseconds()
	wg := new(sync.WaitGroup)
	for i := 0; i < numItems; i++ {
		wg.Add(1)
		go func(ii int) { ii++; wg.Done() }(i)
	}
	wg.Wait()
	now2 = time.Nanoseconds()
	fnOut("goroutine")
	
}