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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.
package gob
import (
"bytes"
"io"
"os"
"runtime"
"testing"
)
type Bench struct {
A int
B float64
C string
D []byte
}
func benchmarkEndToEnd(b *testing.B, ctor func() interface{}, 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() interface{} {
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() interface{} {
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() interface{} {
v := &Bench{7, 3.2, "now is the time", nil}
Register(v)
arr := make([]interface{}, 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 != 4 {
t.Fatalf("mallocs per decode of type Bench: %v; wanted 4\n", allocs)
}
}
func BenchmarkEncodeComplex128Slice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]complex128, 1000)
for i := range a {
a[i] = 1.2 + 3.4i
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
buf.Reset()
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkEncodeFloat64Slice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]float64, 1000)
for i := range a {
a[i] = 1.23e4
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
buf.Reset()
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkEncodeInt32Slice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]int32, 1000)
for i := range a {
a[i] = 1234
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
buf.Reset()
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
}
}
func BenchmarkEncodeStringSlice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]string, 1000)
for i := range a {
a[i] = "now is the time"
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
buf.Reset()
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
}
}
// 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 BenchmarkDecodeComplex128Slice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]complex128, 1000)
for i := range a {
a[i] = 1.2 + 3.4i
}
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
x := make([]complex128, 1000)
bbuf := benchmarkBuf{data: buf.Bytes()}
b.ResetTimer()
for i := 0; i < b.N; i++ {
bbuf.reset()
dec := NewDecoder(&bbuf)
err := dec.Decode(&x)
if err != nil {
b.Fatal(i, err)
}
}
}
func BenchmarkDecodeFloat64Slice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]float64, 1000)
for i := range a {
a[i] = 1.23e4
}
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
x := make([]float64, 1000)
bbuf := benchmarkBuf{data: buf.Bytes()}
b.ResetTimer()
for i := 0; i < b.N; i++ {
bbuf.reset()
dec := NewDecoder(&bbuf)
err := dec.Decode(&x)
if err != nil {
b.Fatal(i, err)
}
}
}
func BenchmarkDecodeInt32Slice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]int32, 1000)
for i := range a {
a[i] = 1234
}
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
x := make([]int32, 1000)
bbuf := benchmarkBuf{data: buf.Bytes()}
b.ResetTimer()
for i := 0; i < b.N; i++ {
bbuf.reset()
dec := NewDecoder(&bbuf)
err := dec.Decode(&x)
if err != nil {
b.Fatal(i, err)
}
}
}
func BenchmarkDecodeStringSlice(b *testing.B) {
var buf bytes.Buffer
enc := NewEncoder(&buf)
a := make([]string, 1000)
for i := range a {
a[i] = "now is the time"
}
err := enc.Encode(a)
if err != nil {
b.Fatal(err)
}
x := make([]string, 1000)
bbuf := benchmarkBuf{data: buf.Bytes()}
b.ResetTimer()
for i := 0; i < b.N; i++ {
bbuf.reset()
dec := NewDecoder(&bbuf)
err := dec.Decode(&x)
if err != nil {
b.Fatal(i, err)
}
}
}
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