binary_encoding_bench_test.go

package main

import (
	"bytes"
	"encoding/binary"
	"testing"
)

type Data struct {
	ID        uint32
	Timestamp uint32
	Value     int16
}

func EncodeWithByteOrder() {
	data := &Data{
		ID: 100, Timestamp: 1600000000, Value: 10,
	}
	buf := make([]byte, 10)
	binary.BigEndian.PutUint32(buf[0:], data.ID)
	binary.BigEndian.PutUint32(buf[4:], data.Timestamp)
	binary.BigEndian.PutUint16(buf[8:], uint16(data.Value))
}

func EncodeWithByteStream() {
	data := &Data{
		ID: 100, Timestamp: 1600000000, Value: 10,
	}
	buf := &bytes.Buffer{}
	_ = binary.Write(buf, binary.BigEndian, data)
}

func BenchmarkEncodeWithByteOrder(b *testing.B) {
	for i := 1; i < b.N; i++ {
		EncodeWithByteOrder()
	}
}

func BenchmarkEncodeWithStream(b *testing.B) {
	for i := 1; i < b.N; i++ {
		EncodeWithByteStream()
	}
}

$ go test -benchmem -bench=. .
goos: darwin
goarch: amd64
pkg: hoge
cpu: Intel(R) Core(TM) i7-8559U CPU @ 2.70GHz
BenchmarkEncodeWithByteOrder-8          1000000000               1.118 ns/op           0 B/op          0 allocs/op
BenchmarkEncodeWithStream-8              5775616               202.5 ns/op           144 B/op          4 allocs/op
PASS
ok      hoge    2.877s