95 lines
2.2 KiB
Go
95 lines
2.2 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pprof_test
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import (
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"bytes"
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"fmt"
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"hash/crc32"
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"os/exec"
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"runtime"
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. "runtime/pprof"
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"strings"
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"testing"
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"unsafe"
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)
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func TestCPUProfile(t *testing.T) {
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switch runtime.GOOS {
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case "darwin":
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out, err := exec.Command("uname", "-a").CombinedOutput()
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if err != nil {
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t.Fatal(err)
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}
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vers := string(out)
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t.Logf("uname -a: %v", vers)
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// Lion uses "Darwin Kernel Version 11".
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if strings.Contains(vers, "Darwin Kernel Version 10") && strings.Contains(vers, "RELEASE_X86_64") {
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t.Logf("skipping test on known-broken kernel (64-bit Leopard / Snow Leopard)")
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return
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}
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case "plan9":
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// unimplemented
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return
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}
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buf := make([]byte, 100000)
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var prof bytes.Buffer
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if err := StartCPUProfile(&prof); err != nil {
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t.Fatal(err)
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}
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// This loop takes about a quarter second on a 2 GHz laptop.
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// We only need to get one 100 Hz clock tick, so we've got
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// a 25x safety buffer.
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for i := 0; i < 1000; i++ {
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crc32.ChecksumIEEE(buf)
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}
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StopCPUProfile()
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// Convert []byte to []uintptr.
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bytes := prof.Bytes()
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l := len(bytes) / int(unsafe.Sizeof(uintptr(0)))
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val := *(*[]uintptr)(unsafe.Pointer(&bytes))
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val = val[:l]
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if l < 13 {
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t.Fatalf("profile too short: %#x", val)
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}
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fmt.Println(val, l)
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hd, val, tl := val[:5], val[5:l-3], val[l-3:]
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fmt.Println(hd, val, tl)
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if hd[0] != 0 || hd[1] != 3 || hd[2] != 0 || hd[3] != 1e6/100 || hd[4] != 0 {
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t.Fatalf("unexpected header %#x", hd)
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}
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if tl[0] != 0 || tl[1] != 1 || tl[2] != 0 {
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t.Fatalf("malformed end-of-data marker %#x", tl)
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}
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// Check that profile is well formed and contains ChecksumIEEE.
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found := false
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for len(val) > 0 {
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if len(val) < 2 || val[0] < 1 || val[1] < 1 || uintptr(len(val)) < 2+val[1] {
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t.Fatalf("malformed profile. leftover: %#x", val)
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}
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for _, pc := range val[2 : 2+val[1]] {
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f := runtime.FuncForPC(pc)
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if f == nil {
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continue
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}
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if strings.Contains(f.Name(), "ChecksumIEEE") ||
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(strings.Contains(f.Name(), "update") && strings.Contains(f.Name(), "crc32")) {
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found = true
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}
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}
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val = val[2+val[1]:]
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}
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if !found {
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t.Fatal("did not find ChecksumIEEE in the profile")
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}
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}
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