mirror of git://gcc.gnu.org/git/gcc.git
574 lines
12 KiB
Go
574 lines
12 KiB
Go
// Copyright 2014 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 trace_test
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import (
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"bytes"
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"flag"
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"internal/race"
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"internal/trace"
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"io"
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"io/ioutil"
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"net"
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"os"
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"runtime"
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. "runtime/trace"
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"strconv"
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"sync"
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"testing"
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"time"
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)
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var (
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saveTraces = flag.Bool("savetraces", false, "save traces collected by tests")
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)
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// TestEventBatch tests Flush calls that happen during Start
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// don't produce corrupted traces.
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func TestEventBatch(t *testing.T) {
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if race.Enabled {
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t.Skip("skipping in race mode")
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}
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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if testing.Short() {
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t.Skip("skipping in short mode")
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}
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// During Start, bunch of records are written to reflect the current
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// snapshot of the program, including state of each goroutines.
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// And some string constants are written to the trace to aid trace
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// parsing. This test checks Flush of the buffer occurred during
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// this process doesn't cause corrupted traces.
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// When a Flush is called during Start is complicated
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// so we test with a range of number of goroutines hoping that one
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// of them triggers Flush.
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// This range was chosen to fill up a ~64KB buffer with traceEvGoCreate
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// and traceEvGoWaiting events (12~13bytes per goroutine).
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for g := 4950; g < 5050; g++ {
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n := g
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t.Run("G="+strconv.Itoa(n), func(t *testing.T) {
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var wg sync.WaitGroup
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wg.Add(n)
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in := make(chan bool, 1000)
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for i := 0; i < n; i++ {
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go func() {
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<-in
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wg.Done()
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}()
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}
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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for i := 0; i < n; i++ {
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in <- true
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}
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wg.Wait()
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Stop()
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_, err := trace.Parse(buf, "")
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if err == trace.ErrTimeOrder {
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t.Skipf("skipping trace: %v", err)
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}
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if err != nil {
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t.Fatalf("failed to parse trace: %v", err)
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}
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})
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}
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}
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func TestTraceStartStop(t *testing.T) {
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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Stop()
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size := buf.Len()
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if size == 0 {
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t.Fatalf("trace is empty")
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}
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time.Sleep(100 * time.Millisecond)
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if size != buf.Len() {
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t.Fatalf("trace writes after stop: %v -> %v", size, buf.Len())
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}
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saveTrace(t, buf, "TestTraceStartStop")
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}
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func TestTraceDoubleStart(t *testing.T) {
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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Stop()
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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if err := Start(buf); err == nil {
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t.Fatalf("succeed to start tracing second time")
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}
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Stop()
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Stop()
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}
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func TestTrace(t *testing.T) {
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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Stop()
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saveTrace(t, buf, "TestTrace")
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_, err := trace.Parse(buf, "")
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if err == trace.ErrTimeOrder {
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t.Skipf("skipping trace: %v", err)
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}
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if err != nil {
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t.Fatalf("failed to parse trace: %v", err)
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}
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}
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func parseTrace(t *testing.T, r io.Reader) ([]*trace.Event, map[uint64]*trace.GDesc) {
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res, err := trace.Parse(r, "")
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if err == trace.ErrTimeOrder {
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t.Skipf("skipping trace: %v", err)
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}
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if err != nil {
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t.Fatalf("failed to parse trace: %v", err)
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}
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gs := trace.GoroutineStats(res.Events)
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for goid := range gs {
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// We don't do any particular checks on the result at the moment.
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// But still check that RelatedGoroutines does not crash, hang, etc.
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_ = trace.RelatedGoroutines(res.Events, goid)
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}
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return res.Events, gs
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}
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func testBrokenTimestamps(t *testing.T, data []byte) {
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// On some processors cputicks (used to generate trace timestamps)
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// produce non-monotonic timestamps. It is important that the parser
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// distinguishes logically inconsistent traces (e.g. missing, excessive
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// or misordered events) from broken timestamps. The former is a bug
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// in tracer, the latter is a machine issue.
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// So now that we have a consistent trace, test that (1) parser does
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// not return a logical error in case of broken timestamps
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// and (2) broken timestamps are eventually detected and reported.
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trace.BreakTimestampsForTesting = true
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defer func() {
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trace.BreakTimestampsForTesting = false
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}()
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for i := 0; i < 1e4; i++ {
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_, err := trace.Parse(bytes.NewReader(data), "")
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if err == trace.ErrTimeOrder {
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return
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}
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if err != nil {
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t.Fatalf("failed to parse trace: %v", err)
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}
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}
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}
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func TestTraceStress(t *testing.T) {
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if runtime.GOOS == "js" {
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t.Skip("no os.Pipe on js")
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}
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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var wg sync.WaitGroup
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done := make(chan bool)
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// Create a goroutine blocked before tracing.
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wg.Add(1)
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go func() {
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<-done
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wg.Done()
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}()
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// Create a goroutine blocked in syscall before tracing.
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rp, wp, err := os.Pipe()
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if err != nil {
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t.Fatalf("failed to create pipe: %v", err)
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}
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defer func() {
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rp.Close()
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wp.Close()
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}()
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wg.Add(1)
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go func() {
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var tmp [1]byte
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rp.Read(tmp[:])
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<-done
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wg.Done()
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}()
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time.Sleep(time.Millisecond) // give the goroutine above time to block
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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procs := runtime.GOMAXPROCS(10)
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time.Sleep(50 * time.Millisecond) // test proc stop/start events
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go func() {
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runtime.LockOSThread()
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for {
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select {
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case <-done:
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return
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default:
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runtime.Gosched()
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}
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}
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}()
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runtime.GC()
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// Trigger GC from malloc.
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n := int(1e3)
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if runtime.GOOS == "openbsd" && runtime.GOARCH == "arm" {
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// Reduce allocation to avoid running out of
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// memory on the builder - see issue/12032.
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n = 512
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}
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for i := 0; i < n; i++ {
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_ = make([]byte, 1<<20)
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}
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// Create a bunch of busy goroutines to load all Ps.
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for p := 0; p < 10; p++ {
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wg.Add(1)
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go func() {
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// Do something useful.
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tmp := make([]byte, 1<<16)
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for i := range tmp {
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tmp[i]++
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}
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_ = tmp
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<-done
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wg.Done()
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}()
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}
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// Block in syscall.
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wg.Add(1)
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go func() {
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var tmp [1]byte
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rp.Read(tmp[:])
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<-done
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wg.Done()
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}()
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// Test timers.
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timerDone := make(chan bool)
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go func() {
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time.Sleep(time.Millisecond)
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timerDone <- true
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}()
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<-timerDone
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// A bit of network.
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("listen failed: %v", err)
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}
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defer ln.Close()
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go func() {
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c, err := ln.Accept()
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if err != nil {
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return
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}
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time.Sleep(time.Millisecond)
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var buf [1]byte
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c.Write(buf[:])
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c.Close()
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}()
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c, err := net.Dial("tcp", ln.Addr().String())
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if err != nil {
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t.Fatalf("dial failed: %v", err)
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}
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var tmp [1]byte
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c.Read(tmp[:])
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c.Close()
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go func() {
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runtime.Gosched()
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select {}
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}()
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// Unblock helper goroutines and wait them to finish.
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wp.Write(tmp[:])
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wp.Write(tmp[:])
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close(done)
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wg.Wait()
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runtime.GOMAXPROCS(procs)
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Stop()
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saveTrace(t, buf, "TestTraceStress")
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trace := buf.Bytes()
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parseTrace(t, buf)
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testBrokenTimestamps(t, trace)
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}
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// Do a bunch of various stuff (timers, GC, network, etc) in a separate goroutine.
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// And concurrently with all that start/stop trace 3 times.
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func TestTraceStressStartStop(t *testing.T) {
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if runtime.GOOS == "js" {
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t.Skip("no os.Pipe on js")
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}
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(8))
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outerDone := make(chan bool)
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go func() {
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defer func() {
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outerDone <- true
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}()
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var wg sync.WaitGroup
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done := make(chan bool)
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wg.Add(1)
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go func() {
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<-done
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wg.Done()
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}()
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rp, wp, err := os.Pipe()
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if err != nil {
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t.Errorf("failed to create pipe: %v", err)
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return
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}
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defer func() {
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rp.Close()
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wp.Close()
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}()
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wg.Add(1)
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go func() {
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var tmp [1]byte
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rp.Read(tmp[:])
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<-done
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wg.Done()
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}()
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time.Sleep(time.Millisecond)
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go func() {
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runtime.LockOSThread()
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for {
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select {
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case <-done:
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return
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default:
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runtime.Gosched()
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}
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}
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}()
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runtime.GC()
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// Trigger GC from malloc.
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n := int(1e3)
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if runtime.GOOS == "openbsd" && runtime.GOARCH == "arm" {
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// Reduce allocation to avoid running out of
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// memory on the builder - see issue/12032.
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n = 512
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}
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for i := 0; i < n; i++ {
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_ = make([]byte, 1<<20)
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}
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// Create a bunch of busy goroutines to load all Ps.
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for p := 0; p < 10; p++ {
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wg.Add(1)
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go func() {
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// Do something useful.
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tmp := make([]byte, 1<<16)
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for i := range tmp {
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tmp[i]++
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}
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_ = tmp
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<-done
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wg.Done()
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}()
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}
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// Block in syscall.
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wg.Add(1)
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go func() {
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var tmp [1]byte
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rp.Read(tmp[:])
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<-done
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wg.Done()
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}()
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runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
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// Test timers.
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timerDone := make(chan bool)
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go func() {
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time.Sleep(time.Millisecond)
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timerDone <- true
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}()
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<-timerDone
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// A bit of network.
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Errorf("listen failed: %v", err)
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return
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}
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defer ln.Close()
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go func() {
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c, err := ln.Accept()
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if err != nil {
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return
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}
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time.Sleep(time.Millisecond)
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var buf [1]byte
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c.Write(buf[:])
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c.Close()
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}()
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c, err := net.Dial("tcp", ln.Addr().String())
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if err != nil {
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t.Errorf("dial failed: %v", err)
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return
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}
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var tmp [1]byte
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c.Read(tmp[:])
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c.Close()
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go func() {
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runtime.Gosched()
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select {}
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}()
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// Unblock helper goroutines and wait them to finish.
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wp.Write(tmp[:])
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wp.Write(tmp[:])
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close(done)
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wg.Wait()
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}()
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for i := 0; i < 3; i++ {
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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time.Sleep(time.Millisecond)
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Stop()
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saveTrace(t, buf, "TestTraceStressStartStop")
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trace := buf.Bytes()
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parseTrace(t, buf)
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testBrokenTimestamps(t, trace)
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}
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<-outerDone
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}
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func TestTraceFutileWakeup(t *testing.T) {
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if IsEnabled() {
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t.Skip("skipping because -test.trace is set")
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}
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buf := new(bytes.Buffer)
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if err := Start(buf); err != nil {
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t.Fatalf("failed to start tracing: %v", err)
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}
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(8))
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c0 := make(chan int, 1)
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c1 := make(chan int, 1)
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c2 := make(chan int, 1)
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const procs = 2
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var done sync.WaitGroup
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done.Add(4 * procs)
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for p := 0; p < procs; p++ {
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const iters = 1e3
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go func() {
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for i := 0; i < iters; i++ {
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runtime.Gosched()
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c0 <- 0
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}
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done.Done()
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}()
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go func() {
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for i := 0; i < iters; i++ {
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runtime.Gosched()
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<-c0
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}
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done.Done()
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}()
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go func() {
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for i := 0; i < iters; i++ {
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runtime.Gosched()
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select {
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case c1 <- 0:
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case c2 <- 0:
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}
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}
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done.Done()
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}()
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go func() {
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for i := 0; i < iters; i++ {
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runtime.Gosched()
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select {
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case <-c1:
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case <-c2:
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}
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}
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done.Done()
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}()
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}
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done.Wait()
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Stop()
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saveTrace(t, buf, "TestTraceFutileWakeup")
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events, _ := parseTrace(t, buf)
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// Check that (1) trace does not contain EvFutileWakeup events and
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// (2) there are no consecutive EvGoBlock/EvGCStart/EvGoBlock events
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// (we call runtime.Gosched between all operations, so these would be futile wakeups).
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gs := make(map[uint64]int)
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for _, ev := range events {
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switch ev.Type {
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case trace.EvFutileWakeup:
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t.Fatalf("found EvFutileWakeup event")
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case trace.EvGoBlockSend, trace.EvGoBlockRecv, trace.EvGoBlockSelect:
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if gs[ev.G] == 2 {
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t.Fatalf("goroutine %v blocked on %v at %v right after start",
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ev.G, trace.EventDescriptions[ev.Type].Name, ev.Ts)
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}
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if gs[ev.G] == 1 {
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t.Fatalf("goroutine %v blocked on %v at %v while blocked",
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ev.G, trace.EventDescriptions[ev.Type].Name, ev.Ts)
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}
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gs[ev.G] = 1
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case trace.EvGoStart:
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if gs[ev.G] == 1 {
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gs[ev.G] = 2
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}
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default:
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delete(gs, ev.G)
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}
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}
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}
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func saveTrace(t *testing.T, buf *bytes.Buffer, name string) {
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if !*saveTraces {
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return
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}
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if err := ioutil.WriteFile(name+".trace", buf.Bytes(), 0600); err != nil {
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t.Errorf("failed to write trace file: %s", err)
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}
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}
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