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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.
// +build !nacl
package pprof
import (
"bytes"
"context"
"fmt"
"internal/testenv"
"io"
"math/big"
"os"
"os/exec"
"regexp"
"runtime"
"runtime/pprof/internal/profile"
"strings"
"sync"
"testing"
"time"
)
func cpuHogger(f func(), dur time.Duration) {
// We only need to get one 100 Hz clock tick, so we've got
// a large safety buffer.
// But do at least 500 iterations (which should take about 100ms),
// otherwise TestCPUProfileMultithreaded can fail if only one
// thread is scheduled during the testing period.
t0 := time.Now()
for i := 0; i < 500 || time.Since(t0) < dur; i++ {
f()
}
}
var (
salt1 = 0
salt2 = 0
)
// The actual CPU hogging function.
// Must not call other functions nor access heap/globals in the loop,
// otherwise under race detector the samples will be in the race runtime.
func cpuHog1() {
foo := salt1
for i := 0; i < 1e5; i++ {
if foo > 0 {
foo *= foo
} else {
foo *= foo + 1
}
}
salt1 = foo
}
func cpuHog2() {
foo := salt2
for i := 0; i < 1e5; i++ {
if foo > 0 {
foo *= foo
} else {
foo *= foo + 2
}
}
salt2 = foo
}
func TestCPUProfile(t *testing.T) {
testCPUProfile(t, []string{"runtime/pprof.cpuHog1"}, func(dur time.Duration) {
cpuHogger(cpuHog1, dur)
})
}
func TestCPUProfileMultithreaded(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
testCPUProfile(t, []string{"runtime/pprof.cpuHog1", "runtime/pprof.cpuHog2"}, func(dur time.Duration) {
c := make(chan int)
go func() {
cpuHogger(cpuHog1, dur)
c <- 1
}()
cpuHogger(cpuHog2, dur)
<-c
})
}
func TestCPUProfileInlining(t *testing.T) {
testCPUProfile(t, []string{"runtime/pprof.inlinedCallee", "runtime/pprof.inlinedCaller"}, func(dur time.Duration) {
cpuHogger(inlinedCaller, dur)
})
}
func inlinedCaller() {
inlinedCallee()
}
func inlinedCallee() {
// We could just use cpuHog1, but for loops prevent inlining
// right now. :(
foo := salt1
i := 0
loop:
if foo > 0 {
foo *= foo
} else {
foo *= foo + 1
}
if i++; i < 1e5 {
goto loop
}
salt1 = foo
}
func parseProfile(t *testing.T, valBytes []byte, f func(uintptr, []*profile.Location, map[string][]string)) {
p, err := profile.Parse(bytes.NewReader(valBytes))
if err != nil {
t.Fatal(err)
}
for _, sample := range p.Sample {
count := uintptr(sample.Value[0])
f(count, sample.Location, sample.Label)
}
}
func testCPUProfile(t *testing.T, need []string, f func(dur time.Duration)) {
switch runtime.GOOS {
case "darwin":
switch runtime.GOARCH {
case "arm", "arm64":
// nothing
default:
out, err := exec.Command("uname", "-a").CombinedOutput()
if err != nil {
t.Fatal(err)
}
vers := string(out)
t.Logf("uname -a: %v", vers)
}
case "plan9":
t.Skip("skipping on plan9")
}
const maxDuration = 5 * time.Second
// If we're running a long test, start with a long duration
// for tests that try to make sure something *doesn't* happen.
duration := 5 * time.Second
if testing.Short() {
duration = 200 * time.Millisecond
}
// Profiling tests are inherently flaky, especially on a
// loaded system, such as when this test is running with
// several others under go test std. If a test fails in a way
// that could mean it just didn't run long enough, try with a
// longer duration.
for duration <= maxDuration {
var prof bytes.Buffer
if err := StartCPUProfile(&prof); err != nil {
t.Fatal(err)
}
f(duration)
StopCPUProfile()
if profileOk(t, need, prof, duration) {
return
}
duration *= 2
if duration <= maxDuration {
t.Logf("retrying with %s duration", duration)
}
}
if badOS[runtime.GOOS] {
t.Skipf("ignoring failure on %s; see golang.org/issue/13841", runtime.GOOS)
return
}
// Ignore the failure if the tests are running in a QEMU-based emulator,
// QEMU is not perfect at emulating everything.
// IN_QEMU environmental variable is set by some of the Go builders.
// IN_QEMU=1 indicates that the tests are running in QEMU. See issue 9605.
if os.Getenv("IN_QEMU") == "1" {
t.Skip("ignore the failure in QEMU; see golang.org/issue/9605")
return
}
t.FailNow()
}
func contains(slice []string, s string) bool {
for i := range slice {
if slice[i] == s {
return true
}
}
return false
}
func profileOk(t *testing.T, need []string, prof bytes.Buffer, duration time.Duration) (ok bool) {
ok = true
// Check that profile is well formed and contains need.
have := make([]uintptr, len(need))
var samples uintptr
var buf bytes.Buffer
parseProfile(t, prof.Bytes(), func(count uintptr, stk []*profile.Location, labels map[string][]string) {
fmt.Fprintf(&buf, "%d:", count)
fprintStack(&buf, stk)
samples += count
for i, name := range need {
if semi := strings.Index(name, ";"); semi > -1 {
kv := strings.SplitN(name[semi+1:], "=", 2)
if len(kv) != 2 || !contains(labels[kv[0]], kv[1]) {
continue
}
name = name[:semi]
}
for _, loc := range stk {
for _, line := range loc.Line {
if strings.Contains(line.Function.Name, name) {
have[i] += count
}
}
}
}
fmt.Fprintf(&buf, "\n")
})
t.Logf("total %d CPU profile samples collected:\n%s", samples, buf.String())
if samples < 10 && runtime.GOOS == "windows" {
// On some windows machines we end up with
// not enough samples due to coarse timer
// resolution. Let it go.
t.Log("too few samples on Windows (golang.org/issue/10842)")
return false
}
// Check that we got a reasonable number of samples.
// We used to always require at least ideal/4 samples,
// but that is too hard to guarantee on a loaded system.
// Now we accept 10 or more samples, which we take to be
// enough to show that at least some profiling is occurring.
if ideal := uintptr(duration * 100 / time.Second); samples == 0 || (samples < ideal/4 && samples < 10) {
t.Logf("too few samples; got %d, want at least %d, ideally %d", samples, ideal/4, ideal)
ok = false
}
if len(need) == 0 {
return ok
}
var total uintptr
for i, name := range need {
total += have[i]
t.Logf("%s: %d\n", name, have[i])
}
if total == 0 {
t.Logf("no samples in expected functions")
ok = false
}
// We'd like to check a reasonable minimum, like
// total / len(have) / smallconstant, but this test is
// pretty flaky (see bug 7095). So we'll just test to
// make sure we got at least one sample.
min := uintptr(1)
for i, name := range need {
if have[i] < min {
t.Logf("%s has %d samples out of %d, want at least %d, ideally %d", name, have[i], total, min, total/uintptr(len(have)))
ok = false
}
}
return ok
}
// Fork can hang if preempted with signals frequently enough (see issue 5517).
// Ensure that we do not do this.
func TestCPUProfileWithFork(t *testing.T) {
testenv.MustHaveExec(t)
heap := 1 << 30
if runtime.GOOS == "android" {
// Use smaller size for Android to avoid crash.
heap = 100 << 20
}
if testing.Short() {
heap = 100 << 20
}
// This makes fork slower.
garbage := make([]byte, heap)
// Need to touch the slice, otherwise it won't be paged in.
done := make(chan bool)
go func() {
for i := range garbage {
garbage[i] = 42
}
done <- true
}()
<-done
var prof bytes.Buffer
if err := StartCPUProfile(&prof); err != nil {
t.Fatal(err)
}
defer StopCPUProfile()
for i := 0; i < 10; i++ {
exec.Command(os.Args[0], "-h").CombinedOutput()
}
}
// Test that profiler does not observe runtime.gogo as "user" goroutine execution.
// If it did, it would see inconsistent state and would either record an incorrect stack
// or crash because the stack was malformed.
func TestGoroutineSwitch(t *testing.T) {
// How much to try. These defaults take about 1 seconds
// on a 2012 MacBook Pro. The ones in short mode take
// about 0.1 seconds.
tries := 10
count := 1000000
if testing.Short() {
tries = 1
}
for try := 0; try < tries; try++ {
var prof bytes.Buffer
if err := StartCPUProfile(&prof); err != nil {
t.Fatal(err)
}
for i := 0; i < count; i++ {
runtime.Gosched()
}
StopCPUProfile()
// Read profile to look for entries for runtime.gogo with an attempt at a traceback.
// The special entry
parseProfile(t, prof.Bytes(), func(count uintptr, stk []*profile.Location, _ map[string][]string) {
// An entry with two frames with 'System' in its top frame
// exists to record a PC without a traceback. Those are okay.
if len(stk) == 2 {
name := stk[1].Line[0].Function.Name
if name == "runtime._System" || name == "runtime._ExternalCode" || name == "runtime._GC" {
return
}
}
// Otherwise, should not see runtime.gogo.
// The place we'd see it would be the inner most frame.
name := stk[0].Line[0].Function.Name
if name == "runtime.gogo" {
var buf bytes.Buffer
fprintStack(&buf, stk)
t.Fatalf("found profile entry for runtime.gogo:\n%s", buf.String())
}
})
}
}
func fprintStack(w io.Writer, stk []*profile.Location) {
for _, loc := range stk {
fmt.Fprintf(w, " %#x", loc.Address)
fmt.Fprintf(w, " (")
for i, line := range loc.Line {
if i > 0 {
fmt.Fprintf(w, " ")
}
fmt.Fprintf(w, "%s:%d", line.Function.Name, line.Line)
}
fmt.Fprintf(w, ")")
}
fmt.Fprintf(w, "\n")
}
// Test that profiling of division operations is okay, especially on ARM. See issue 6681.
func TestMathBigDivide(t *testing.T) {
testCPUProfile(t, nil, func(duration time.Duration) {
t := time.After(duration)
pi := new(big.Int)
for {
for i := 0; i < 100; i++ {
n := big.NewInt(2646693125139304345)
d := big.NewInt(842468587426513207)
pi.Div(n, d)
}
select {
case <-t:
return
default:
}
}
})
}
// Operating systems that are expected to fail the tests. See issue 13841.
var badOS = map[string]bool{
"darwin": true,
"netbsd": true,
"plan9": true,
"dragonfly": true,
"solaris": true,
}
func TestBlockProfile(t *testing.T) {
type TestCase struct {
name string
f func()
re string
}
tests := [...]TestCase{
{"chan recv", blockChanRecv, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ runtime\.chanrecv1\+0x[0-9a-f]+ .*/src/runtime/chan.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockChanRecv\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
{"chan send", blockChanSend, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ runtime\.chansend1\+0x[0-9a-f]+ .*/src/runtime/chan.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockChanSend\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
{"chan close", blockChanClose, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ runtime\.chanrecv1\+0x[0-9a-f]+ .*/src/runtime/chan.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockChanClose\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
{"select recv async", blockSelectRecvAsync, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ runtime\.selectgo\+0x[0-9a-f]+ .*/src/runtime/select.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockSelectRecvAsync\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
{"select send sync", blockSelectSendSync, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ runtime\.selectgo\+0x[0-9a-f]+ .*/src/runtime/select.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockSelectSendSync\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
{"mutex", blockMutex, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ sync\.\(\*Mutex\)\.Lock\+0x[0-9a-f]+ .*/src/sync/mutex\.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockMutex\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
{"cond", blockCond, `
[0-9]+ [0-9]+ @( 0x[[:xdigit:]]+)+
# 0x[0-9a-f]+ sync\.\(\*Cond\)\.Wait\+0x[0-9a-f]+ .*/src/sync/cond\.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.blockCond\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9a-f]+ runtime/pprof\.TestBlockProfile\+0x[0-9a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
`},
}
runtime.SetBlockProfileRate(1)
defer runtime.SetBlockProfileRate(0)
for _, test := range tests {
test.f()
}
var w bytes.Buffer
Lookup("block").WriteTo(&w, 1)
prof := w.String()
if !strings.HasPrefix(prof, "--- contention:\ncycles/second=") {
t.Fatalf("Bad profile header:\n%v", prof)
}
if strings.HasSuffix(prof, "#\t0x0\n\n") {
t.Errorf("Useless 0 suffix:\n%v", prof)
}
for _, test := range tests {
if !regexp.MustCompile(strings.Replace(test.re, "\t", "\t+", -1)).MatchString(prof) {
t.Fatalf("Bad %v entry, expect:\n%v\ngot:\n%v", test.name, test.re, prof)
}
}
}
const blockDelay = 10 * time.Millisecond
func blockChanRecv() {
c := make(chan bool)
go func() {
time.Sleep(blockDelay)
c <- true
}()
<-c
}
func blockChanSend() {
c := make(chan bool)
go func() {
time.Sleep(blockDelay)
<-c
}()
c <- true
}
func blockChanClose() {
c := make(chan bool)
go func() {
time.Sleep(blockDelay)
close(c)
}()
<-c
}
func blockSelectRecvAsync() {
const numTries = 3
c := make(chan bool, 1)
c2 := make(chan bool, 1)
go func() {
for i := 0; i < numTries; i++ {
time.Sleep(blockDelay)
c <- true
}
}()
for i := 0; i < numTries; i++ {
select {
case <-c:
case <-c2:
}
}
}
func blockSelectSendSync() {
c := make(chan bool)
c2 := make(chan bool)
go func() {
time.Sleep(blockDelay)
<-c
}()
select {
case c <- true:
case c2 <- true:
}
}
func blockMutex() {
var mu sync.Mutex
mu.Lock()
go func() {
time.Sleep(blockDelay)
mu.Unlock()
}()
// Note: Unlock releases mu before recording the mutex event,
// so it's theoretically possible for this to proceed and
// capture the profile before the event is recorded. As long
// as this is blocked before the unlock happens, it's okay.
mu.Lock()
}
func blockCond() {
var mu sync.Mutex
c := sync.NewCond(&mu)
mu.Lock()
go func() {
time.Sleep(blockDelay)
mu.Lock()
c.Signal()
mu.Unlock()
}()
c.Wait()
mu.Unlock()
}
func TestMutexProfile(t *testing.T) {
old := runtime.SetMutexProfileFraction(1)
defer runtime.SetMutexProfileFraction(old)
if old != 0 {
t.Fatalf("need MutexProfileRate 0, got %d", old)
}
blockMutex()
var w bytes.Buffer
Lookup("mutex").WriteTo(&w, 1)
prof := w.String()
if !strings.HasPrefix(prof, "--- mutex:\ncycles/second=") {
t.Errorf("Bad profile header:\n%v", prof)
}
prof = strings.Trim(prof, "\n")
lines := strings.Split(prof, "\n")
if len(lines) != 6 {
t.Errorf("expected 6 lines, got %d %q\n%s", len(lines), prof, prof)
}
if len(lines) < 6 {
return
}
// checking that the line is like "35258904 1 @ 0x48288d 0x47cd28 0x458931"
r2 := `^\d+ 1 @(?: 0x[[:xdigit:]]+)+`
//r2 := "^[0-9]+ 1 @ 0x[0-9a-f x]+$"
if ok, err := regexp.MatchString(r2, lines[3]); err != nil || !ok {
t.Errorf("%q didn't match %q", lines[3], r2)
}
r3 := "^#.*runtime/pprof.blockMutex.*$"
if ok, err := regexp.MatchString(r3, lines[5]); err != nil || !ok {
t.Errorf("%q didn't match %q", lines[5], r3)
}
}
func func1(c chan int) { <-c }
func func2(c chan int) { <-c }
func func3(c chan int) { <-c }
func func4(c chan int) { <-c }
func TestGoroutineCounts(t *testing.T) {
// Setting GOMAXPROCS to 1 ensures we can force all goroutines to the
// desired blocking point.
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
c := make(chan int)
for i := 0; i < 100; i++ {
switch {
case i%10 == 0:
go func1(c)
case i%2 == 0:
go func2(c)
default:
go func3(c)
}
// Let goroutines block on channel
for j := 0; j < 5; j++ {
runtime.Gosched()
}
}
var w bytes.Buffer
goroutineProf := Lookup("goroutine")
// Check debug profile
goroutineProf.WriteTo(&w, 1)
prof := w.String()
if !containsInOrder(prof, "\n50 @ ", "\n40 @", "\n10 @", "\n1 @") {
t.Errorf("expected sorted goroutine counts:\n%s", prof)
}
// Check proto profile
w.Reset()
goroutineProf.WriteTo(&w, 0)
p, err := profile.Parse(&w)
if err != nil {
t.Errorf("error parsing protobuf profile: %v", err)
}
if err := p.CheckValid(); err != nil {
t.Errorf("protobuf profile is invalid: %v", err)
}
if !containsCounts(p, []int64{50, 40, 10, 1}) {
t.Errorf("expected count profile to contain goroutines with counts %v, got %v",
[]int64{50, 40, 10, 1}, p)
}
close(c)
time.Sleep(10 * time.Millisecond) // let goroutines exit
}
func containsInOrder(s string, all ...string) bool {
for _, t := range all {
i := strings.Index(s, t)
if i < 0 {
return false
}
s = s[i+len(t):]
}
return true
}
func containsCounts(prof *profile.Profile, counts []int64) bool {
m := make(map[int64]int)
for _, c := range counts {
m[c]++
}
for _, s := range prof.Sample {
// The count is the single value in the sample
if len(s.Value) != 1 {
return false
}
m[s.Value[0]]--
}
for _, n := range m {
if n > 0 {
return false
}
}
return true
}
// Issue 18836.
func TestEmptyCallStack(t *testing.T) {
t.Parallel()
var buf bytes.Buffer
p := NewProfile("test18836")
p.Add("foo", 47674)
p.WriteTo(&buf, 1)
p.Remove("foo")
got := buf.String()
prefix := "test18836 profile: total 1\n"
if !strings.HasPrefix(got, prefix) {
t.Fatalf("got:\n\t%q\nwant prefix:\n\t%q\n", got, prefix)
}
lostevent := "lostProfileEvent"
if !strings.Contains(got, lostevent) {
t.Fatalf("got:\n\t%q\ndoes not contain:\n\t%q\n", got, lostevent)
}
}
func TestCPUProfileLabel(t *testing.T) {
testCPUProfile(t, []string{"runtime/pprof.cpuHogger;key=value"}, func(dur time.Duration) {
Do(context.Background(), Labels("key", "value"), func(context.Context) {
cpuHogger(cpuHog1, dur)
})
})
}