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// Copyright 2009 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 ignore
// Repeated malloc test.
package main
import (
"flag"
"fmt"
"runtime"
"strconv"
)
var chatty = flag.Bool("v", false, "chatty")
var reverse = flag.Bool("r", false, "reverse")
var longtest = flag.Bool("l", false, "long test")
var b []*byte
var stats = new(runtime.MemStats)
func OkAmount(size, n uintptr) bool {
if n < size {
return false
}
if size < 16*8 {
if n > size+16 {
return false
}
} else {
if n > size*9/8 {
return false
}
}
return true
}
func AllocAndFree(size, count int) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
if *chatty {
fmt.Printf("size=%d count=%d ...\n", size, count)
}
runtime.ReadMemStats(stats)
n1 := stats.Alloc
for i := 0; i < count; i++ {
b[i] = runtime.Alloc(uintptr(size))
base, n := runtime.Lookup(b[i])
if base != b[i] || !OkAmount(uintptr(size), n) {
println("lookup failed: got", base, n, "for", b[i])
panic("fail")
}
runtime.ReadMemStats(stats)
if stats.Sys > 1e9 {
println("too much memory allocated")
panic("fail")
}
}
runtime.ReadMemStats(stats)
n2 := stats.Alloc
if *chatty {
fmt.Printf("size=%d count=%d stats=%+v\n", size, count, *stats)
}
n3 := stats.Alloc
for j := 0; j < count; j++ {
i := j
if *reverse {
i = count - 1 - j
}
alloc := uintptr(stats.Alloc)
base, n := runtime.Lookup(b[i])
if base != b[i] || !OkAmount(uintptr(size), n) {
println("lookup failed: got", base, n, "for", b[i])
panic("fail")
}
runtime.Free(b[i])
runtime.ReadMemStats(stats)
if stats.Alloc != uint64(alloc-n) {
println("free alloc got", stats.Alloc, "expected", alloc-n, "after free of", n)
panic("fail")
}
if stats.Sys > 1e9 {
println("too much memory allocated")
panic("fail")
}
}
runtime.ReadMemStats(stats)
n4 := stats.Alloc
if *chatty {
fmt.Printf("size=%d count=%d stats=%+v\n", size, count, *stats)
}
if n2-n1 != n3-n4 {
println("wrong alloc count: ", n2-n1, n3-n4)
panic("fail")
}
}
func atoi(s string) int {
i, _ := strconv.Atoi(s)
return i
}
func main() {
runtime.MemProfileRate = 0 // disable profiler
flag.Parse()
b = make([]*byte, 10000)
if flag.NArg() > 0 {
AllocAndFree(atoi(flag.Arg(0)), atoi(flag.Arg(1)))
return
}
maxb := 1 << 22
if !*longtest {
maxb = 1 << 19
}
for j := 1; j <= maxb; j <<= 1 {
n := len(b)
max := uintptr(1 << 28)
if !*longtest {
max = uintptr(maxb)
}
if uintptr(j)*uintptr(n) > max {
n = int(max / uintptr(j))
}
if n < 10 {
n = 10
}
for m := 1; m <= n; {
AllocAndFree(j, m)
if m == n {
break
}
m = 5 * m / 4
if m < 4 {
m++
}
if m > n {
m = n
}
}
}
}
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