golang: json (un)marshal benchmark

json_bench.go

package main

import (
	"bytes"
	"encoding/json"
	"io/ioutil"
	"testing"
)

type js struct {
	I    int64
	D    [64]byte
	Name string
	Tm   string
	M    map[string]interface{}
	Goop interface{}
}

func BenchmarkStreamEncode(b *testing.B) {
	j := js{
		M:    map[string]interface{}{"key": 3, "bloo": "blaap"},
		Goop: map[string]interface{}{"jeiajewa": 41, "jiqjweijqie": "iwjeqiejwqi"},
	}
	dec := json.NewEncoder(ioutil.Discard)

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		dec.Encode(j)
	}
}

func BenchmarkMarshal(b *testing.B) {
	j := js{
		M:    map[string]interface{}{"key": 3, "bloo": "blaap"},
		Goop: map[string]interface{}{"jeiajewa": 41, "jiqjweijqie": "iwjeqiejwqi"},
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		by, _ := json.Marshal(j)
		ioutil.Discard.Write(by)
	}
}

func BenchmarkMarshalNoWrite(b *testing.B) {
	j := js{
		M:    map[string]interface{}{"key": 3, "bloo": "blaap"},
		Goop: map[string]interface{}{"jeiajewa": 41, "jiqjweijqie": "iwjeqiejwqi"},
	}

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		json.Marshal(j)
	}
}

func BenchmarkStreamDecode(b *testing.B) {
	j := js{
		M:    map[string]interface{}{"key": 3, "bloo": "blaap"},
		Goop: map[string]interface{}{"jeiajewa": 41, "jiqjweijqie": "iwjeqiejwqi"},
	}
	by, _ := json.Marshal(j)

	buf := bytes.NewBuffer(by)
	dec := json.NewDecoder(buf)

	var res js

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		dec.Decode(&res)
		buf.Write(by)
	}
}

func BenchmarkBufferDecode(b *testing.B) {
	j := js{
		M:    map[string]interface{}{"key": 3, "bloo": "blaap"},
		Goop: map[string]interface{}{"jeiajewa": 41, "jiqjweijqie": "iwjeqiejwqi"},
	}
	by, _ := json.Marshal(j)

	buf := bytes.NewReader(by)
	dec := json.NewDecoder(buf)

	var res js

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		dec.Decode(&res)
		buf.Seek(0, 0)
	}
}

func BenchmarkUnmarshal(b *testing.B) {
	j := js{
		M:    map[string]interface{}{"key": 3, "bloo": "blaap"},
		Goop: map[string]interface{}{"jeiajewa": 41, "jiqjweijqie": "iwjeqiejwqi"},
	}
	by, _ := json.Marshal(j)

	var res js

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		json.Unmarshal(by, &res)
	}
}