On Fri, May 21, 2021 at 7:46 AM tapi...@gmail.com <tapir....@gmail.com> wrote:
>
> From the outputs of the following program,
> it looks the stack of a goroutine doesn't shrink immediately.
> Will it shrink at some point eventually?
>
>
> package main
>
> func f(i int) byte {
> type T int // avoid f being inline
> var a [1<<20]byte // make stack grow
> return a[i]
> }
>
> func main(){
> var x int
> println(&x) // 0xc000034770
> f(100)
> println(&x) // 0xc0002fff70
>
> // It looks the stack hasn't shrunk here.
>
> f(100)
> println(&x) // 0xc0002fff70
> }
Stack shrinking occurs during garbage collection, and only if the
goroutine isn't doing anything and isn't sitting in a system call or a
cgo call.
Ian
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