In my opinion, the slice which "as" point to, is all allocated on the heap
in two case . so, I think the mark time should not be so different. Can you
tell me more details for you answer(when as is allocated on the stack, gc
has a smaller task.)?
在 2019年8月15日星期四 UTC+8上午11:02:46，Gergely Födémesi写道：
>
> .On Wed, Aug 14, 2019, 17:56 sandao <yiren...@gmail.com <javascript:>>
> 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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>
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