Because when you sleep you deschedule the process/thread by the OS - and so the
cached code and data needs to be reloaded so operations aren’t slower until
then.
> On Nov 4, 2021, at 11:19 AM, 尚义龙 <sylhel...@gmail.com> wrote:
>
>
> I was doing pressure testing in my project and found a large gap in the time
> interval due to time.Sleep, which I abstracted to the following code:
> code 1:
> ```go
> func TestSleep(t *testing.T) {
> for i := 0; i < 8; i++ {
> //time.Sleep(time.Second)
> t1 := time.Now()
> fmt.Println( time.Since(t1))
> }
> }
> ```
> output:
> ```shell
> 229ns
> 37ns
> 36ns
> 37ns
> 36ns
> 38ns
> 37ns
> 39ns
> ```
> code 2(add time.Sleep):
> ```
> func TestSleep(t *testing.T) {
> for i := 0; i < 8; i++ {
> time.Sleep(time.Second)
> t1 := time.Now()
> fmt.Println( time.Since(t1))
> }
> }
> ```
> ```shell
> 471ns
> 267ns
> 855ns
> 484ns
> 359ns
> 296ns
> 324ns
> 302ns
> ```
> I have two questions:
> 1. Why is there such a big difference between the two results (only the
> time.Sleep difference)?
> 2. Why is the first output in code1 much larger than the next?
> please.
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