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// Copyright 2011 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.
package pprof_test
import (
"bytes"
"hash/crc32"
"os/exec"
"runtime"
. "runtime/pprof"
"strings"
"testing"
"unsafe"
)
func TestCPUProfile(t *testing.T) {
switch runtime.GOOS {
case "darwin":
out, err := exec.Command("uname", "-a").CombinedOutput()
if err != nil {
t.Fatal(err)
}
vers := string(out)
t.Logf("uname -a: %v", vers)
// Lion uses "Darwin Kernel Version 11".
if strings.Contains(vers, "Darwin Kernel Version 10") && strings.Contains(vers, "RELEASE_X86_64") {
t.Logf("skipping test on known-broken kernel (64-bit Leopard / Snow Leopard)")
return
}
case "plan9":
// unimplemented
return
}
buf := make([]byte, 100000)
var prof bytes.Buffer
if err := StartCPUProfile(&prof); err != nil {
t.Fatal(err)
}
// This loop takes about a quarter second on a 2 GHz laptop.
// We only need to get one 100 Hz clock tick, so we've got
// a 25x safety buffer.
for i := 0; i < 1000; i++ {
crc32.ChecksumIEEE(buf)
}
StopCPUProfile()
// Convert []byte to []uintptr.
bytes := prof.Bytes()
val := *(*[]uintptr)(unsafe.Pointer(&bytes))
val = val[:len(bytes)/int(unsafe.Sizeof(uintptr(0)))]
if len(val) < 10 {
t.Fatalf("profile too short: %#x", val)
}
if val[0] != 0 || val[1] != 3 || val[2] != 0 || val[3] != 1e6/100 || val[4] != 0 {
t.Fatalf("unexpected header %#x", val[:5])
}
// Check that profile is well formed and contains ChecksumIEEE.
found := false
val = val[5:]
for len(val) > 0 {
if len(val) < 2 || val[0] < 1 || val[1] < 1 || uintptr(len(val)) < 2+val[1] {
t.Fatalf("malformed profile. leftover: %#x", val)
}
for _, pc := range val[2 : 2+val[1]] {
f := runtime.FuncForPC(pc)
if f == nil {
continue
}
if strings.Contains(f.Name(), "ChecksumIEEE") {
found = true
}
}
val = val[2+val[1]:]
}
if !found {
t.Fatal("did not find ChecksumIEEE in the profile")
}
}
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