1 package sysfs
2
3 import (
4 "io"
5 "io/fs"
6 "os"
7 "path"
8 "testing"
9 "time"
10
11 "github.com/tetratelabs/wazero/experimental/sys"
12 )
13
14 func BenchmarkFsFileUtimesNs(b *testing.B) {
15 f, errno := OpenOSFile(path.Join(b.TempDir(), "file"), sys.O_CREAT, 0)
16 if errno != 0 {
17 b.Fatal(errno)
18 }
19 defer f.Close()
20
21 atim := int64(123*time.Second + 4*time.Microsecond)
22 mtim := atim
23
24 b.ResetTimer()
25 for i := 0; i < b.N; i++ {
26 if errno := f.Utimens(atim, mtim); errno != 0 {
27 b.Fatal(errno)
28 }
29 }
30 }
31
32 func BenchmarkFsFileRead(b *testing.B) {
33 dirFS := os.DirFS("testdata")
34 embedFS, err := fs.Sub(testdata, "testdata")
35 if err != nil {
36 b.Fatal(err)
37 }
38
39 benches := []struct {
40 name string
41 fs fs.FS
42 pread bool
43 }{
44 {name: "os.DirFS Read", fs: dirFS, pread: false},
45 {name: "os.DirFS Pread", fs: dirFS, pread: true},
46 {name: "embed.api.FS Read", fs: embedFS, pread: false},
47 {name: "embed.api.FS Pread", fs: embedFS, pread: true},
48 }
49
50 buf := make([]byte, 3)
51
52 for _, bc := range benches {
53 bc := bc
54
55 b.Run(bc.name, func(b *testing.B) {
56 name := "wazero.txt"
57 f, errno := OpenFSFile(bc.fs, name, sys.O_RDONLY, 0)
58 if errno != 0 {
59 b.Fatal(errno)
60 }
61 defer f.Close()
62
63 b.ResetTimer()
64 for i := 0; i < b.N; i++ {
65 b.StopTimer()
66
67 var n int
68 var errno sys.Errno
69
70
71 if _, errno = f.Seek(0, io.SeekStart); errno != 0 {
72 b.Fatal(errno)
73 }
74
75 b.StartTimer()
76 if bc.pread {
77 n, errno = f.Pread(buf, 3)
78 } else {
79 n, errno = f.Read(buf)
80 }
81 b.StopTimer()
82
83 if errno != 0 {
84 b.Fatal(errno)
85 } else if bufLen := len(buf); n < bufLen {
86 b.Fatalf("nread %d less than capacity %d", n, bufLen)
87 }
88 }
89 })
90 }
91 }
92
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