Your two programs are not the same.
Try fmt.Println(bs[0]) instead of len(bs) in the
first one.
V.
On Monday, 5 March 2018 16:05:05 UTC+1, di...@veryhaha.com wrote:
>
> Slice:
>
> package main
>
> import "fmt"
> import "runtime"
>
> func printMemStat(gcFirstly bool) {
> if gcFirstly {
> runtime.GC()
> }
> var stat runtime.MemStats
> runtime.ReadMemStats(&stat)
> println(stat.Alloc)
> }
>
> func main() {
> bs := make([]int, 1000000)
>
> printMemStat(false) // about 8071272
> printMemStat(true) // about 67376
> // looks the underlying bytes has already
> // been garbage collected in the above call.
>
> fmt.Println(len(bs))
> }
>
>
> Custom type:
>
> package main
>
> import "fmt"
> import "runtime"
>
> type T struct {
> x int
> y *[1000000]int
> }
>
> func printMemStat(gcFirstly bool) {
> if gcFirstly {
> runtime.GC()
> }
> var stat runtime.MemStats
> runtime.ReadMemStats(&stat)
> println(stat.Alloc)
> }
>
> func main() {
> t := T{123, new([1000000]int)}
>
> printMemStat(false) // about 8071576
> printMemStat(true) // about 8071576
>
> fmt.Println(t.x)
> }
>
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