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select {
case <-ch:
  // channel is closed, this is executed
default:
  // channel is still open, the previous case is not executed
  close(ch)
}


once := sync.Once{}

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func Test_double_check_unsafe(t *testing.T) {
	m := make(map[int]int64)
	mu := sync.Mutex{}
	wg := sync.WaitGroup{}
	wg.Add(100 * 10)
	for i := 0; i < 100; i++ {
		for j := 0; j < 10; j++ {
			go func(j int) {
				defer wg.Done()
				v := m[j]

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	m := make(map[[8]byte][]int64, 1e8)
	for i := 0; i < 10; i++ {
		start := time.Now()
		runtime.GC()
		fmt.Printf("GC took %s\n", time.Since(start))
	}
	runtime.KeepAlive(m)
	//x := 10
	//var mx [x]int
	//fmt.Println(mx)

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func floatSlice2bytes(s []float64) []byte {
	b := (*reflect.SliceHeader)(unsafe.Pointer(&s))
	b.Cap = b.Cap * 8
	b.Len = b.Len * 8
	return *(*[]byte)(unsafe.Pointer(&s))
}

func bytes2floatSlice(s []byte) []float64 {
	b := (*reflect.SliceHeader)(unsafe.Pointer(&s))
	b.Cap = b.Cap / 8

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