You should use Go 1.7.1 or later.
On Thursday, 29 September 2016 23:00:25 UTC+10, 刘桂祥 wrote:
>
> package main
>
> import "runtime"
>
> func main() {
> m := new(runtime.MemStats)
> runtime.ReadMemStats(m)
> cap := 1024
> println("debug0")
> s := make([]byte, cap)
> println("debug1")
> _ = s
> runtime.ReadMemStats(m)
> println("memstats:", m.Alloc, m.Mallocs)
> }
>
> I use go1.4.2 and In go source code add mallocgc debug info
> here is the result:
> debug0
> mallocgc: 1024
> mallocgc: 272
> mallocgc: 32
> debug1
>
> I doubt there is other goroutine call the mallocgc
>
> but if I use go test -bench="." makeslice_test.go
> func BenchmarkMakeSlice2(b *testing.B) {
> b.ReportAllocs()
> cap := 1024
> for i := 0; i < b.N; i++ {
> s := make([]byte, cap, cap)
> _ = s
> }
> }
> the output is:
> 14120 ns/op 1024 B/op 1 allocs/op
> I infer the go test know all the mallocgc and also know which is user's
> source code to call it
>
> my guess
>
> 在 2016年9月29日星期四 UTC+8下午5:30:54，Dave Cheney写道：
>
>> Sorry, you'll have to work harder to generate a memory profile. My
>> github.com/pkg/profile package may help automate some of the work, but
>> may introduce a few allocations of its own which you will have to filter
>> out.
>
>
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