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
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
// $G $D/$F.go && $L $F.$A && ./$A.out
// 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.
// 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 = &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) {
if *chatty {
fmt.Printf("size=%d count=%d ...\n", size, count)
}
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")
}
if runtime.MemStats.Sys > 1e9 {
println("too much memory allocated")
panic("fail")
}
}
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])
if stats.Alloc != uint64(alloc-n) {
println("free alloc got", stats.Alloc, "expected", alloc-n, "after free of", n)
panic("fail")
}
if runtime.MemStats.Sys > 1e9 {
println("too much memory allocated")
panic("fail")
}
}
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
}
}
}
}
|
