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path: root/src/pkg/runtime/pprof/pprof_test.go
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Diffstat (limited to 'src/pkg/runtime/pprof/pprof_test.go')
-rw-r--r--src/pkg/runtime/pprof/pprof_test.go452
1 files changed, 0 insertions, 452 deletions
diff --git a/src/pkg/runtime/pprof/pprof_test.go b/src/pkg/runtime/pprof/pprof_test.go
deleted file mode 100644
index 54f93f861..000000000
--- a/src/pkg/runtime/pprof/pprof_test.go
+++ /dev/null
@@ -1,452 +0,0 @@
-// 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_test
-
-import (
- "bytes"
- "fmt"
- "math/big"
- "os/exec"
- "regexp"
- "runtime"
- . "runtime/pprof"
- "strings"
- "sync"
- "testing"
- "time"
- "unsafe"
-)
-
-func cpuHogger(f func()) {
- // We only need to get one 100 Hz clock tick, so we've got
- // a 100x safety buffer.
- // But do at least 2000 iterations (which should take about 400ms),
- // otherwise TestCPUProfileMultithreaded can fail if only one
- // thread is scheduled during the 1 second period.
- t0 := time.Now()
- for i := 0; i < 2000 || time.Since(t0) < time.Second; 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_test.cpuHog1"}, func() {
- cpuHogger(cpuHog1)
- })
-}
-
-func TestCPUProfileMultithreaded(t *testing.T) {
- defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(2))
- testCPUProfile(t, []string{"runtime/pprof_test.cpuHog1", "runtime/pprof_test.cpuHog2"}, func() {
- c := make(chan int)
- go func() {
- cpuHogger(cpuHog1)
- c <- 1
- }()
- cpuHogger(cpuHog2)
- <-c
- })
-}
-
-func parseProfile(t *testing.T, bytes []byte, f func(uintptr, []uintptr)) {
- // Convert []byte to []uintptr.
- l := len(bytes) / int(unsafe.Sizeof(uintptr(0)))
- val := *(*[]uintptr)(unsafe.Pointer(&bytes))
- val = val[:l]
-
- // 5 for the header, 2 for the per-sample header on at least one sample, 3 for the trailer.
- if l < 5+2+3 {
- t.Logf("profile too short: %#x", val)
- if badOS[runtime.GOOS] {
- t.Skipf("ignoring failure on %s; see golang.org/issue/6047", runtime.GOOS)
- return
- }
- t.FailNow()
- }
-
- hd, val, tl := val[:5], val[5:l-3], val[l-3:]
- if hd[0] != 0 || hd[1] != 3 || hd[2] != 0 || hd[3] != 1e6/100 || hd[4] != 0 {
- t.Fatalf("unexpected header %#x", hd)
- }
-
- if tl[0] != 0 || tl[1] != 1 || tl[2] != 0 {
- t.Fatalf("malformed end-of-data marker %#x", tl)
- }
-
- 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)
- }
- f(val[0], val[2:2+val[1]])
- val = val[2+val[1]:]
- }
-}
-
-func testCPUProfile(t *testing.T, need []string, f func()) {
- 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)
- case "plan9":
- // unimplemented
- return
- }
-
- var prof bytes.Buffer
- if err := StartCPUProfile(&prof); err != nil {
- t.Fatal(err)
- }
- f()
- StopCPUProfile()
-
- // Check that profile is well formed and contains need.
- have := make([]uintptr, len(need))
- parseProfile(t, prof.Bytes(), func(count uintptr, stk []uintptr) {
- for _, pc := range stk {
- f := runtime.FuncForPC(pc)
- if f == nil {
- continue
- }
- for i, name := range need {
- if strings.Contains(f.Name(), name) {
- have[i] += count
- }
- }
- }
- })
-
- if len(need) == 0 {
- return
- }
-
- var total uintptr
- for i, name := range need {
- total += have[i]
- t.Logf("%s: %d\n", name, have[i])
- }
- ok := true
- if total == 0 {
- t.Logf("no CPU profile samples collected")
- 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
- }
- }
-
- if !ok {
- if badOS[runtime.GOOS] {
- t.Skipf("ignoring failure on %s; see golang.org/issue/6047", runtime.GOOS)
- return
- }
- t.FailNow()
- }
-}
-
-func TestCPUProfileWithFork(t *testing.T) {
- // Fork can hang if preempted with signals frequently enough (see issue 5517).
- // Ensure that we do not do this.
- heap := 1 << 30
- 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("go").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 []uintptr) {
- // 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 {
- f := runtime.FuncForPC(stk[1])
- if f != nil && (f.Name() == "System" || f.Name() == "ExternalCode") {
- return
- }
- }
-
- // Otherwise, should not see runtime.gogo.
- // The place we'd see it would be the inner most frame.
- f := runtime.FuncForPC(stk[0])
- if f != nil && f.Name() == "runtime.gogo" {
- var buf bytes.Buffer
- for _, pc := range stk {
- f := runtime.FuncForPC(pc)
- if f == nil {
- fmt.Fprintf(&buf, "%#x ?:0\n", pc)
- } else {
- file, line := f.FileLine(pc)
- fmt.Fprintf(&buf, "%#x %s:%d\n", pc, file, line)
- }
- }
- t.Fatalf("found profile entry for runtime.gogo:\n%s", buf.String())
- }
- })
- }
-}
-
-// Test that profiling of division operations is okay, especially on ARM. See issue 6681.
-func TestMathBigDivide(t *testing.T) {
- testCPUProfile(t, nil, func() {
- t := time.After(5 * time.Second)
- 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 6047.
-var badOS = map[string]bool{
- "darwin": true,
- "netbsd": true,
- "plan9": 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[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ runtime\.chanrecv1\+0x[0-9,a-f]+ .*/src/runtime/chan.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockChanRecv\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-`},
- {"chan send", blockChanSend, `
-[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ runtime\.chansend1\+0x[0-9,a-f]+ .*/src/runtime/chan.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockChanSend\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-`},
- {"chan close", blockChanClose, `
-[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ runtime\.chanrecv1\+0x[0-9,a-f]+ .*/src/runtime/chan.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockChanClose\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-`},
- {"select recv async", blockSelectRecvAsync, `
-[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ runtime\.selectgo\+0x[0-9,a-f]+ .*/src/runtime/select.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockSelectRecvAsync\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-`},
- {"select send sync", blockSelectSendSync, `
-[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ runtime\.selectgo\+0x[0-9,a-f]+ .*/src/runtime/select.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockSelectSendSync\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-`},
- {"mutex", blockMutex, `
-[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ sync\.\(\*Mutex\)\.Lock\+0x[0-9,a-f]+ .*/src/sync/mutex\.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockMutex\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-`},
- {"cond", blockCond, `
-[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
-# 0x[0-9,a-f]+ sync\.\(\*Cond\)\.Wait\+0x[0-9,a-f]+ .*/src/sync/cond\.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.blockCond\+0x[0-9,a-f]+ .*/src/runtime/pprof/pprof_test.go:[0-9]+
-# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-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)
- }
-
- for _, test := range tests {
- if !regexp.MustCompile(test.re).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() {
- c := make(chan bool, 1)
- c2 := make(chan bool, 1)
- go func() {
- time.Sleep(blockDelay)
- c <- true
- }()
- 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()
- }()
- 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()
-}
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