go+json 还是没有python+json 结合得完美，解析速度比python 慢

go 测试代码：

package main

import (
	"encoding/json"
	"fmt"
	"github.com/bitly/go-simplejson"
	"github.com/mreiferson/go-ujson"
	"time"
)

var JsonBytes = []byte(`{"field_1": true, "field_2": true, "field_3": "XXXXYX", "field_4": true, "field_5": true, "field_6": true, "field_7": false, "field_8": true, "field_9": false, "field_10": false, "field_11": {"p": {}, "m": {}, "d": ["5", "3", "4", "8", "9", "7", "1", "2", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22"]}, "field_12": false, "field_13": false, "field_14": "LLLLLL", "field_15": true, "field_16": "en-US", "field_17": "2013-11-26T05:49:06.236458", "field_18": "Shengzhou", "field_19": true, "field_20": false, "field_21": false, "field_22": "xxxxx...@hotmail.com", "field_23": "http://www.xxxxxxx.com/yyyyyyyyy", "field_24": true, "field_25": true, "field_26": "0001-01-01T00:00:00", "field_27": true, "field_28": true, "field_29": false, "field_30": true, "field_31": "", "field_32": true, "field_33": true, "field_34": "wrqer@#$!WEF#@#DSDFFksdniwo3hOwR8ruCeNF.3IkeOe80Yko8n7HvpsrZm", "field_35": false, "field_36": true, "field_37": "0001-01-01T00:00:00", "field_38": "String values encode as JSON strings. InvalidUTF8Error will be returned if an invalid UTF-8 sequence is encountered", "field_39": "female", "field_40": true, "field_41": true, "field_42": "insadesmaenideni", "field_43": "xyxyxyxyx_1233305355583", "field_44": "US", "field_45": {}, "field_46": false, "field_47": 1353270713, "field_48": "2013-11-12T15:38:33.052768", "field_49": "2012-02-29T22:46:18", "field_50": true}`)
var JsonObj map[string]interface{}

func init() {
	json.Unmarshal(JsonBytes, &JsonObj)
}

func BenchmarkJsonDecode() {
	var r map[string]interface{}
	t1 := time.Now()
	for j := 0; j < 1000; j++ {
		//var r struct{}
		json.Unmarshal(JsonBytes, &r)
	}
	t2 := time.Now()
	fmt.Println("loads ", t2.Sub(t1))
}

func BenchmarkJsonDecode2() {
	t1 := time.Now()
	for j := 0; j < 1000; j++ {
		_, err := ujson.NewFromBytes(JsonBytes)
		if err != nil {
			fmt.Println(err.Error())
		}
	}
	t2 := time.Now()
	fmt.Println("go-ujson loads ", t2.Sub(t1))
}

func BenchmarkJsonDecode3() {
	t1 := time.Now()
	for j := 0; j < 1000; j++ {
		_, err := simplejson.NewJson(JsonBytes)
		if err != nil {
			fmt.Println(err.Error())
		}
	}
	t2 := time.Now()
	fmt.Println("simplejson loads ", t2.Sub(t1))
}

func BenchmarkJsonEncode() {
	t1 := time.Now()
	for j := 0; j < 1000; j++ {
		json.Marshal(JsonObj)
	}
	t2 := time.Now()
	fmt.Println("dumps ", t2.Sub(t1))
}

func main() {
	BenchmarkJsonDecode()
	BenchmarkJsonDecode2()
	BenchmarkJsonDecode3()
	BenchmarkJsonEncode()
}

go-ujson官方的loads （decode）的速度是标准库的两倍左右：

BenchmarkUjson    500000          4970 ns/op      20.12 MB/s
BenchmarkStdLib   200000         10323 ns/op       9.69 MB/s

https://github.com/mreiferson/go-ujson

python 测试代码：

# coding=utf8

import time
# import simplejson as json
# import ujson as json
import json

NUM = 1000

# Loads

jsonStr = '{"field_1": true, "field_2": true, "field_3": "XXXXYX", "field_4": true, "field_5": true, "field_6": true, "field_7": false, "field_8": true, "field_9": false, "field_10": false, "field_11": {"p": {}, "m": {}, "d": ["5", "3", "4", "8", "9", "7", "1", "2", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22"]}, "field_12": false, "field_13": false, "field_14": "LLLLLL", "field_15": true, "field_16": "en-US", "field_17": "2013-11-26T05:49:06.236458", "field_18": "Shengzhou", "field_19": true, "field_20": false, "field_21": false, "field_22": "xxxxx...@hotmail.com", "field_23": "http://www.xxxxxxx.com/yyyyyyyyy", "field_24": true, "field_25": true, "field_26": "0001-01-01T00:00:00", "field_27": true, "field_28": true, "field_29": false, "field_30": true, "field_31": "", "field_32": true, "field_33": true, "field_34": "wrqer@#$!WEF#@#DSDFFksdniwo3hOwR8ruCeNF.3IkeOe80Yko8n7HvpsrZm", "field_35": false, "field_36": true, "field_37": "0001-01-01T00:00:00", "field_38": "String values encode as JSON strings. InvalidUTF8Error will be returned if an invalid UTF-8 sequence is encountered", "field_39": "female", "field_40": true, "field_41": true, "field_42": "insadesmaenideni", "field_43": "xyxyxyxyx_1233305355583", "field_44": "US", "field_45": {}, "field_46": false, "field_47": 1353270713, "field_48": "2013-11-12T15:38:33.052768", "field_49": "2012-02-29T22:46:18", "field_50": true}'


def dec():
    for i in xrange(NUM):
        d = json.loads(jsonStr)

t0 = time.time()
dec()
t1 = time.time()
taken_ms = (t1 - t0) * 1000

print "Loads Taken", taken_ms, taken_ms / NUM

# Dumps

o = json.loads(jsonStr)


def enc():
    for i in xrange(NUM):
        json.dumps(o)

t0 = time.time()
enc()
t1 = time.time()
taken_ms = (t1 - t0) * 1000

print "Dumps Taken", taken_ms, taken_ms / NUM

python 代码好简洁！

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