Split out into a reusable function.
parent
e295ef6019
commit
e69cd9188e
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@ -46,11 +46,83 @@ func getFileOffset(f *os.File) (offset int64, err error) {
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return
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}
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func runCreateInParallelTest(
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ctx context.Context,
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dir string) {
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// Ensure that we get parallelism for this test.
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(runtime.NumCPU()))
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// Try for awhile to see if anything breaks.
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const duration = 500 * time.Millisecond
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startTime := time.Now()
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for time.Since(startTime) < duration {
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filename := path.Join(dir, "foo")
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// Set up a function that opens the file with O_CREATE and then appends a
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// byte to it.
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worker := func(id byte) (err error) {
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f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
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if err != nil {
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err = fmt.Errorf("Worker %d: Open: %v", id, err)
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return
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}
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defer f.Close()
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_, err = f.Write([]byte{id})
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if err != nil {
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err = fmt.Errorf("Worker %d: Write: %v", id, err)
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return
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}
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return
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}
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// Run several workers in parallel.
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const numWorkers = 16
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b := syncutil.NewBundle(ctx)
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for i := 0; i < numWorkers; i++ {
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id := byte(i)
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b.Add(func(ctx context.Context) (err error) {
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err = worker(id)
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return
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})
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}
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err := b.Join()
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AssertEq(nil, err)
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// Read the contents of the file. We should see each worker's ID once.
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contents, err := ioutil.ReadFile(filename)
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AssertEq(nil, err)
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idsSeen := make(map[byte]struct{})
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for i, _ := range contents {
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id := contents[i]
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AssertLt(id, numWorkers)
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if _, ok := idsSeen[id]; ok {
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AddFailure("Duplicate ID: %d", id)
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}
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idsSeen[id] = struct{}{}
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}
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AssertEq(numWorkers, len(idsSeen))
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// Delete the file.
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err = os.Remove(filename)
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AssertEq(nil, err)
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}
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}
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////////////////////////////////////////////////////////////////////////
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// Boilerplate
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////////////////////////////////////////////////////////////////////////
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type PosixTest struct {
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ctx context.Context
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// A temporary directory.
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dir string
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@ -66,6 +138,8 @@ func init() { RegisterTestSuite(&PosixTest{}) }
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func (t *PosixTest) SetUp(ti *TestInfo) {
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var err error
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t.ctx = ti.Ctx
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// Create a temporary directory.
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t.dir, err = ioutil.TempDir("", "posix_test")
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if err != nil {
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@ -425,71 +499,7 @@ func (t *PosixTest) RmdirWhileOpenedForReading() {
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}
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func (t *PosixTest) CreateInParallel_NoTruncate() {
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// Ensure that we get parallelism for this test.
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(runtime.NumCPU()))
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// Try for awhile to see if anything breaks.
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const duration = 500 * time.Millisecond
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startTime := time.Now()
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for time.Since(startTime) < duration {
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filename := path.Join(t.dir, "foo")
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// Set up a function that opens the file with O_CREATE and then appends a
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// byte to it.
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worker := func(id byte) (err error) {
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f, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
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if err != nil {
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err = fmt.Errorf("Worker %d: Open: %v", id, err)
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return
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}
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defer f.Close()
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_, err = f.Write([]byte{id})
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if err != nil {
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err = fmt.Errorf("Worker %d: Write: %v", id, err)
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return
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}
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return
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}
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// Run several workers in parallel.
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const numWorkers = 16
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b := syncutil.NewBundle(context.Background())
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for i := 0; i < numWorkers; i++ {
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id := byte(i)
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b.Add(func(ctx context.Context) (err error) {
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err = worker(id)
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return
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})
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}
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err := b.Join()
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AssertEq(nil, err)
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// Read the contents of the file. We should see each worker's ID once.
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contents, err := ioutil.ReadFile(filename)
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AssertEq(nil, err)
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idsSeen := make(map[byte]struct{})
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for i, _ := range contents {
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id := contents[i]
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AssertLt(id, numWorkers)
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if _, ok := idsSeen[id]; ok {
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AddFailure("Duplicate ID: %d", id)
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}
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idsSeen[id] = struct{}{}
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}
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AssertEq(numWorkers, len(idsSeen))
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// Delete the file.
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err = os.Remove(filename)
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AssertEq(nil, err)
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}
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runCreateInParallelTest(t.ctx, t.dir)
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}
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func (t *PosixTest) CreateInParallel_Truncate() {
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