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![Russ Cox](/assets/img/avatar_default.png)
Drops mallocrep1.go back to a reasonable amount of time. (154 -> 0.8 seconds on my Mac) Fixes #2085. R=golang-dev, dvyukov, r CC=golang-dev https://golang.org/cl/4811045
144 lines
2.7 KiB
Go
144 lines
2.7 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Repeated malloc test.
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package main
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import (
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"flag"
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"fmt"
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"runtime"
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"strconv"
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)
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var chatty = flag.Bool("v", false, "chatty")
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var reverse = flag.Bool("r", false, "reverse")
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var longtest = flag.Bool("l", false, "long test")
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var b []*byte
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var stats = &runtime.MemStats
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func OkAmount(size, n uintptr) bool {
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if n < size {
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return false
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}
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if size < 16*8 {
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if n > size+16 {
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return false
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}
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} else {
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if n > size*9/8 {
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return false
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}
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}
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return true
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}
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func AllocAndFree(size, count int) {
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if *chatty {
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fmt.Printf("size=%d count=%d ...\n", size, count)
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}
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runtime.UpdateMemStats()
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n1 := stats.Alloc
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for i := 0; i < count; i++ {
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b[i] = runtime.Alloc(uintptr(size))
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base, n := runtime.Lookup(b[i])
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if base != b[i] || !OkAmount(uintptr(size), n) {
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println("lookup failed: got", base, n, "for", b[i])
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panic("fail")
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}
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runtime.UpdateMemStats()
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if stats.Sys > 1e9 {
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println("too much memory allocated")
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panic("fail")
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}
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}
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runtime.UpdateMemStats()
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n2 := stats.Alloc
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if *chatty {
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fmt.Printf("size=%d count=%d stats=%+v\n", size, count, *stats)
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}
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n3 := stats.Alloc
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for j := 0; j < count; j++ {
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i := j
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if *reverse {
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i = count - 1 - j
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}
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alloc := uintptr(stats.Alloc)
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base, n := runtime.Lookup(b[i])
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if base != b[i] || !OkAmount(uintptr(size), n) {
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println("lookup failed: got", base, n, "for", b[i])
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panic("fail")
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}
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runtime.Free(b[i])
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runtime.UpdateMemStats()
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if stats.Alloc != uint64(alloc-n) {
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println("free alloc got", stats.Alloc, "expected", alloc-n, "after free of", n)
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panic("fail")
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}
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if runtime.MemStats.Sys > 1e9 {
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println("too much memory allocated")
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panic("fail")
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}
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}
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runtime.UpdateMemStats()
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n4 := stats.Alloc
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if *chatty {
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fmt.Printf("size=%d count=%d stats=%+v\n", size, count, *stats)
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}
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if n2-n1 != n3-n4 {
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println("wrong alloc count: ", n2-n1, n3-n4)
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panic("fail")
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}
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}
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func atoi(s string) int {
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i, _ := strconv.Atoi(s)
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return i
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}
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func main() {
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runtime.MemProfileRate = 0 // disable profiler
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flag.Parse()
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b = make([]*byte, 10000)
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if flag.NArg() > 0 {
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AllocAndFree(atoi(flag.Arg(0)), atoi(flag.Arg(1)))
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return
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}
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maxb := 1 << 22
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if !*longtest {
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maxb = 1 << 19
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}
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for j := 1; j <= maxb; j <<= 1 {
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n := len(b)
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max := uintptr(1 << 28)
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if !*longtest {
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max = uintptr(maxb)
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}
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if uintptr(j)*uintptr(n) > max {
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n = int(max / uintptr(j))
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}
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if n < 10 {
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n = 10
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}
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for m := 1; m <= n; {
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AllocAndFree(j, m)
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if m == n {
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break
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}
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m = 5 * m / 4
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if m < 4 {
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m++
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}
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if m > n {
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m = n
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}
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}
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}
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}
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