/usr/share/go-1.8/test/fixedbugs/issue15277.go is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | // run
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build amd64
package main
import "runtime"
type big [10 << 20]byte
func f(x *big, start int64) {
if delta := inuse() - start; delta < 9<<20 {
println("after alloc: expected delta at least 9MB, got: ", delta)
}
runtime.KeepAlive(x)
x = nil
if delta := inuse() - start; delta > 1<<20 {
println("after drop: expected delta below 1MB, got: ", delta)
}
x = new(big)
if delta := inuse() - start; delta < 9<<20 {
println("second alloc: expected delta at least 9MB, got: ", delta)
}
runtime.KeepAlive(x)
}
func main() {
x := inuse()
f(new(big), x)
}
func inuse() int64 {
runtime.GC()
var st runtime.MemStats
runtime.ReadMemStats(&st)
return int64(st.Alloc)
}
|