1 // Copyright 2011 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
18 func TestCPUProfile(t *testing.T) {
21 out, err := exec.Command("uname", "-a").CombinedOutput()
26 t.Logf("uname -a: %v", vers)
27 // Lion uses "Darwin Kernel Version 11".
28 if strings.Contains(vers, "Darwin Kernel Version 10") && strings.Contains(vers, "RELEASE_X86_64") {
29 t.Logf("skipping test on known-broken kernel (64-bit Leopard / Snow Leopard)")
37 buf := make([]byte, 100000)
39 if err := StartCPUProfile(&prof); err != nil {
42 // This loop takes about a quarter second on a 2 GHz laptop.
43 // We only need to get one 100 Hz clock tick, so we've got
44 // a 25x safety buffer.
45 for i := 0; i < 1000; i++ {
46 crc32.ChecksumIEEE(buf)
50 // Convert []byte to []uintptr.
52 val := *(*[]uintptr)(unsafe.Pointer(&bytes))
53 val = val[:len(bytes)/int(unsafe.Sizeof(uintptr(0)))]
56 t.Fatalf("profile too short: %#x", val)
58 if val[0] != 0 || val[1] != 3 || val[2] != 0 || val[3] != 1e6/100 || val[4] != 0 {
59 t.Fatalf("unexpected header %#x", val[:5])
62 // Check that profile is well formed and contains ChecksumIEEE.
66 if len(val) < 2 || val[0] < 1 || val[1] < 1 || uintptr(len(val)) < 2+val[1] {
67 t.Fatalf("malformed profile. leftover: %#x", val)
69 for _, pc := range val[2 : 2+val[1]] {
70 f := runtime.FuncForPC(pc)
74 if strings.Contains(f.Name(), "ChecksumIEEE") ||
75 (strings.Contains(f.Name(), "update") && strings.Contains(f.Name(), "crc32")) {
83 t.Fatal("did not find ChecksumIEEE in the profile")