.On Wed, Aug 14, 2019, 17:56 sandao <yirenwe...@gmail.com> wrote:
> type A struct {
> a int
> }
>
> func gen() []*A {
> r := make([]*A, 1000000)
> for i := 0; i < len(r); i++ {
> r[i] = &A{i}
> }
> return r
> }
>
> //var as []*A = gen()
>
> func main() {
> go func() {
> err := http.ListenAndServe(":8034", nil)
> if err != nil {
> //fmt.Printf("ListenAndServe:%s\n", err)
> }
> }()
> var as []*A = gen()
> fmt.Println(as[0])
> time.Sleep(100 * time.Second)
> }
>
> when debug gc:
> 1) if the "var as []*A = gen()" is in main , the debug info is : gc 4
> @2.757s 0%: 0.049+0.59+0.025 ms clock, 2.3+0/0.54/0.28+1.2 ms cpu,
> 16->16->0 MB, 31 MB goal, 48 P (forced)
> 2) if the "var as []*A = gen()" is not in main, the debug info is: gc
> 9 @7.172s 0%: 0.077+25+0.020 ms clock, 3.7+0/24/0.73+0.99 ms cpu,
> 16->16->15 MB, 31 MB goal, 48 P (forced)
>
> Anybody konw why the mark time (red numbers) is so different?
>
when as is allocated on the stack, gc has a smaller task.
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