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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