1 files changed, 328 insertions, 0 deletions
diff --git a/src/encoding/gob/timing_test.go b/src/encoding/gob/timing_test.go
new file mode 100644
index 0000000..bdee39c
--- /dev/null
+++ b/src/encoding/gob/timing_test.go
@@ -0,0 +1,328 @@
+// 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.
+
+package gob
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"reflect"
+	"runtime"
+	"testing"
+)
+
+type Bench struct {
+	A int
+	B float64
+	C string
+	D []byte
+}
+
+func benchmarkEndToEnd(b *testing.B, ctor func() any, pipe func() (r io.Reader, w io.Writer, err error)) {
+	b.RunParallel(func(pb *testing.PB) {
+		r, w, err := pipe()
+		if err != nil {
+			b.Fatal("can't get pipe:", err)
+		}
+		v := ctor()
+		enc := NewEncoder(w)
+		dec := NewDecoder(r)
+		for pb.Next() {
+			if err := enc.Encode(v); err != nil {
+				b.Fatal("encode error:", err)
+			}
+			if err := dec.Decode(v); err != nil {
+				b.Fatal("decode error:", err)
+			}
+		}
+	})
+}
+
+func BenchmarkEndToEndPipe(b *testing.B) {
+	benchmarkEndToEnd(b, func() any {
+		return &Bench{7, 3.2, "now is the time", bytes.Repeat([]byte("for all good men"), 100)}
+	}, func() (r io.Reader, w io.Writer, err error) {
+		r, w, err = os.Pipe()
+		return
+	})
+}
+
+func BenchmarkEndToEndByteBuffer(b *testing.B) {
+	benchmarkEndToEnd(b, func() any {
+		return &Bench{7, 3.2, "now is the time", bytes.Repeat([]byte("for all good men"), 100)}
+	}, func() (r io.Reader, w io.Writer, err error) {
+		var buf bytes.Buffer
+		return &buf, &buf, nil
+	})
+}
+
+func BenchmarkEndToEndSliceByteBuffer(b *testing.B) {
+	benchmarkEndToEnd(b, func() any {
+		v := &Bench{7, 3.2, "now is the time", nil}
+		Register(v)
+		arr := make([]any, 100)
+		for i := range arr {
+			arr[i] = v
+		}
+		return &arr
+	}, func() (r io.Reader, w io.Writer, err error) {
+		var buf bytes.Buffer
+		return &buf, &buf, nil
+	})
+}
+
+func TestCountEncodeMallocs(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping malloc count in short mode")
+	}
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
+
+	const N = 1000
+
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	bench := &Bench{7, 3.2, "now is the time", []byte("for all good men")}
+
+	allocs := testing.AllocsPerRun(N, func() {
+		err := enc.Encode(bench)
+		if err != nil {
+			t.Fatal("encode:", err)
+		}
+	})
+	if allocs != 0 {
+		t.Fatalf("mallocs per encode of type Bench: %v; wanted 0\n", allocs)
+	}
+}
+
+func TestCountDecodeMallocs(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping malloc count in short mode")
+	}
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
+
+	const N = 1000
+
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	bench := &Bench{7, 3.2, "now is the time", []byte("for all good men")}
+
+	// Fill the buffer with enough to decode
+	testing.AllocsPerRun(N, func() {
+		err := enc.Encode(bench)
+		if err != nil {
+			t.Fatal("encode:", err)
+		}
+	})
+
+	dec := NewDecoder(&buf)
+	allocs := testing.AllocsPerRun(N, func() {
+		*bench = Bench{}
+		err := dec.Decode(&bench)
+		if err != nil {
+			t.Fatal("decode:", err)
+		}
+	})
+	if allocs != 3 {
+		t.Fatalf("mallocs per decode of type Bench: %v; wanted 3\n", allocs)
+	}
+}
+
+func benchmarkEncodeSlice(b *testing.B, a any) {
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		var buf bytes.Buffer
+		enc := NewEncoder(&buf)
+
+		for pb.Next() {
+			buf.Reset()
+			err := enc.Encode(a)
+			if err != nil {
+				b.Fatal(err)
+			}
+		}
+	})
+}
+
+func BenchmarkEncodeComplex128Slice(b *testing.B) {
+	a := make([]complex128, 1000)
+	for i := range a {
+		a[i] = 1.2 + 3.4i
+	}
+	benchmarkEncodeSlice(b, a)
+}
+
+func BenchmarkEncodeFloat64Slice(b *testing.B) {
+	a := make([]float64, 1000)
+	for i := range a {
+		a[i] = 1.23e4
+	}
+	benchmarkEncodeSlice(b, a)
+}
+
+func BenchmarkEncodeInt32Slice(b *testing.B) {
+	a := make([]int32, 1000)
+	for i := range a {
+		a[i] = int32(i * 100)
+	}
+	benchmarkEncodeSlice(b, a)
+}
+
+func BenchmarkEncodeStringSlice(b *testing.B) {
+	a := make([]string, 1000)
+	for i := range a {
+		a[i] = "now is the time"
+	}
+	benchmarkEncodeSlice(b, a)
+}
+
+func BenchmarkEncodeInterfaceSlice(b *testing.B) {
+	a := make([]any, 1000)
+	for i := range a {
+		a[i] = "now is the time"
+	}
+	benchmarkEncodeSlice(b, a)
+}
+
+// benchmarkBuf is a read buffer we can reset
+type benchmarkBuf struct {
+	offset int
+	data   []byte
+}
+
+func (b *benchmarkBuf) Read(p []byte) (n int, err error) {
+	n = copy(p, b.data[b.offset:])
+	if n == 0 {
+		return 0, io.EOF
+	}
+	b.offset += n
+	return
+}
+
+func (b *benchmarkBuf) ReadByte() (c byte, err error) {
+	if b.offset >= len(b.data) {
+		return 0, io.EOF
+	}
+	c = b.data[b.offset]
+	b.offset++
+	return
+}
+
+func (b *benchmarkBuf) reset() {
+	b.offset = 0
+}
+
+func benchmarkDecodeSlice(b *testing.B, a any) {
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	err := enc.Encode(a)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	ra := reflect.ValueOf(a)
+	rt := ra.Type()
+	b.ResetTimer()
+
+	b.RunParallel(func(pb *testing.PB) {
+		// TODO(#19025): Move per-thread allocation before ResetTimer.
+		rp := reflect.New(rt)
+		rp.Elem().Set(reflect.MakeSlice(rt, ra.Len(), ra.Cap()))
+		p := rp.Interface()
+
+		bbuf := benchmarkBuf{data: buf.Bytes()}
+
+		for pb.Next() {
+			bbuf.reset()
+			dec := NewDecoder(&bbuf)
+			err := dec.Decode(p)
+			if err != nil {
+				b.Fatal(err)
+			}
+		}
+	})
+}
+
+func BenchmarkDecodeComplex128Slice(b *testing.B) {
+	a := make([]complex128, 1000)
+	for i := range a {
+		a[i] = 1.2 + 3.4i
+	}
+	benchmarkDecodeSlice(b, a)
+}
+
+func BenchmarkDecodeFloat64Slice(b *testing.B) {
+	a := make([]float64, 1000)
+	for i := range a {
+		a[i] = 1.23e4
+	}
+	benchmarkDecodeSlice(b, a)
+}
+
+func BenchmarkDecodeInt32Slice(b *testing.B) {
+	a := make([]int32, 1000)
+	for i := range a {
+		a[i] = 1234
+	}
+	benchmarkDecodeSlice(b, a)
+}
+
+func BenchmarkDecodeStringSlice(b *testing.B) {
+	a := make([]string, 1000)
+	for i := range a {
+		a[i] = "now is the time"
+	}
+	benchmarkDecodeSlice(b, a)
+}
+func BenchmarkDecodeStringsSlice(b *testing.B) {
+	a := make([][]string, 1000)
+	for i := range a {
+		a[i] = []string{"now is the time"}
+	}
+	benchmarkDecodeSlice(b, a)
+}
+func BenchmarkDecodeBytesSlice(b *testing.B) {
+	a := make([][]byte, 1000)
+	for i := range a {
+		a[i] = []byte("now is the time")
+	}
+	benchmarkDecodeSlice(b, a)
+}
+
+func BenchmarkDecodeInterfaceSlice(b *testing.B) {
+	a := make([]any, 1000)
+	for i := range a {
+		a[i] = "now is the time"
+	}
+	benchmarkDecodeSlice(b, a)
+}
+
+func BenchmarkDecodeMap(b *testing.B) {
+	count := 1000
+	m := make(map[int]int, count)
+	for i := 0; i < count; i++ {
+		m[i] = i
+	}
+	var buf bytes.Buffer
+	enc := NewEncoder(&buf)
+	err := enc.Encode(m)
+	if err != nil {
+		b.Fatal(err)
+	}
+	bbuf := benchmarkBuf{data: buf.Bytes()}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		var rm map[int]int
+		bbuf.reset()
+		dec := NewDecoder(&bbuf)
+		err := dec.Decode(&rm)
+		if err != nil {
+			b.Fatal(i, err)
+		}
+	}
+}