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
139
140
141
142
143
144
145
146
147
148
149
150
|
//go:build linux
// Package benchmark_test performs a benchmark on a 9P implementation.
package benchmark_test
import (
"fmt"
"io"
"log"
"os"
"os/exec"
"testing"
"github.com/u-root/u-root/pkg/mount"
"github.com/u-root/u-root/pkg/sh"
)
func TestMain(m *testing.M) {
if os.Getuid() == 0 {
if err := sh.RunWithLogs("dhclient", "-ipv6=false"); err != nil {
log.Fatalf("could not configure network for tests: %v", err)
}
targetDir := "/target"
if err := os.MkdirAll(targetDir, 0755); err != nil {
log.Fatal(err)
}
defer os.RemoveAll(targetDir)
mp, err := mount.Mount(os.Getenv("P9_TARGET"), targetDir, "9p", fmt.Sprintf("fscache=none,sync,trans=tcp,port=%s,msize=%d", os.Getenv("P9_PORT"), 64*1024), 0)
if err != nil {
log.Fatal(err)
}
defer mp.Unmount(0)
}
os.Exit(m.Run())
}
func BenchmarkReadP9UsingGo(b *testing.B) {
//testutil.SkipIfNotRoot(b)
src, err := os.Create("/target/zero-go-read")
if err != nil {
b.Error(err)
}
defer os.Remove(src.Name())
defer src.Close()
const size = 100 << 20
const megaByte = 1 << 20
if err := src.Truncate(size); err != nil {
b.Error(err)
}
p := make([]byte, megaByte)
b.ResetTimer()
b.SetBytes(size)
for i := 0; i < b.N; i++ {
if _, err := src.Seek(0, os.SEEK_CUR); err != nil {
b.Errorf("Seek: %v", err)
}
if n, err := io.CopyBuffer(io.Discard, src, p); err != nil {
b.Errorf("Failed to copy: %v", err)
} else if n != size {
b.Errorf("Read %d bytes, wanted %d bytes", n, size)
}
}
}
func BenchmarkReadP9UsingDD(b *testing.B) {
//testutil.SkipIfNotRoot(b)
src, err := os.Create("/target/zero-dd-read")
if err != nil {
b.Error(err)
}
defer os.Remove(src.Name())
defer src.Close()
const size = 100 << 20
const megaByte = 1 << 20
if err := src.Truncate(size); err != nil {
b.Error(err)
}
b.ResetTimer()
b.SetBytes(size)
for i := 0; i < b.N; i++ {
cmd := exec.Command("dd", "if=/target/zero-dd-read", "of=/dev/null", fmt.Sprintf("bs=%d", 1<<20), fmt.Sprintf("count=%d", size/megaByte))
cmd.Stdout, cmd.Stderr = os.Stdout, os.Stderr
if err := cmd.Run(); err != nil {
b.Errorf("Error running dd: %v", err)
}
}
}
func BenchmarkWriteP9UsingGo(b *testing.B) {
//testutil.SkipIfNotRoot(b)
f, err := os.Create("/target/null-go-write")
if err != nil {
b.Error(err)
}
defer os.Remove(f.Name())
defer f.Close()
devZero, err := os.Open("/dev/zero")
if err != nil {
b.Error(err)
}
defer devZero.Close()
const size = 100 << 20
const megaByte = 1 << 20
p := make([]byte, megaByte)
b.ResetTimer()
b.SetBytes(size)
for i := 0; i < b.N; i++ {
if n, err := io.CopyBuffer(f, io.LimitReader(devZero, size), p); err != nil {
b.Errorf("Failed to copy: %v", err)
} else if n != size {
b.Errorf("Wrote %d bytes, wanted %d bytes", n, size)
}
}
}
func BenchmarkWriteP9UsingDD(b *testing.B) {
//testutil.SkipIfNotRoot(b)
defer os.Remove("/target/null-dd-write")
const size = 100 << 20
const megaByte = 1 << 20
b.ResetTimer()
b.SetBytes(size)
for i := 0; i < b.N; i++ {
cmd := exec.Command("dd", "if=/dev/zero", "of=/target/null-dd-write", fmt.Sprintf("bs=%d", megaByte), fmt.Sprintf("count=%d", size/megaByte))
cmd.Stdout, cmd.Stderr = os.Stdout, os.Stderr
if err := cmd.Run(); err != nil {
b.Errorf("Error running dd: %v", err)
}
}
}
|
