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Go標準lib，Json序列化性能問題... JSON比XML和GOB慢，而json大小小於xml文件大小？golang json/gob/xml中的序列化性能
請幫忙指出什麼錯誤？
[email protected]:~/go/projects/wiki$ go run encoding.go
2016/05/24 00:52:16 Serialization by JSON elapsed: 2152195 us
2016/05/24 00:52:16 students.json 19177782
2016/05/24 00:52:17 Serialization by GOB elapsed: 748867 us
2016/05/24 00:52:17 students.gob 9305166
2016/05/24 00:52:18 Serialization by XML elapsed: 1507397 us
2016/05/24 00:52:18 students.xml 26177780
[email protected]:~/go/projects/wiki$ go run encoding.go
2016/05/24 00:52:32 Serialization by JSON elapsed: 1388153 us
2016/05/24 00:52:32 students.json 19177782
2016/05/24 00:52:33 Serialization by GOB elapsed: 502814 us
2016/05/24 00:52:33 students.gob 9305166
2016/05/24 00:52:34 Serialization by XML elapsed: 897859 us
2016/05/24 00:52:34 students.xml 26177780
[email protected]:~/go/projects/wiki$ go run encoding.go
2016/05/24 00:52:41 Serialization by JSON elapsed: 1290359 us
2016/05/24 00:52:41 students.json 19177782
2016/05/24 00:52:42 Serialization by GOB elapsed: 434203 us
2016/05/24 00:52:42 students.gob 9305166
2016/05/24 00:52:42 Serialization by XML elapsed: 862379 us
2016/05/24 00:52:42 students.xml 26177780
代碼：
package main
import (
"log"
"encoding/json"
"encoding/gob"
"encoding/xml"
"math/rand"
"strconv"
"os"
"time"
)
const (
Male=iota
Female
Unknown
ALL=100000
)
type Person struct {
Name string
Id string
Age int
Gender int
}
type Student struct {
Person Person
Grade int
Class string
Teacher Person
}
func (s Student) String() string{
v,err:=json.Marshal(s)
if err!=nil {
log.Fatal("Marshal failed",s)
}
return string(v)
}
var students []Student
func init(){
students=make([]Student,ALL)
for i:=0;i<ALL;i++ {
students[i].Grade=rand.Intn(5)
students[i].Class=strconv.Itoa(students[i].Grade)+",class"+strconv.Itoa(rand.Intn(10))
students[i].Person.Name="Student "+strconv.Itoa(i)
students[i].Person.Id="110"+strconv.Itoa(rand.Intn(10))
students[i].Person.Age=10+rand.Intn(10)
students[i].Person.Gender=rand.Intn(3)
students[i].Teacher.Id="22001154365151344"+strconv.Itoa(rand.Intn(10))
students[i].Teacher.Name="Teacher "+strconv.Itoa(i)
students[i].Teacher.Age=40+rand.Intn(10)
students[i].Teacher.Gender=rand.Intn(3)
}
}
func toJsonFile(){
f,err:=os.OpenFile("students.json",os.O_RDWR ,0600)
if err!=nil {
log.Fatal("Can't open students.json "+ err.Error())
}
defer f.Close()
en:=json.NewEncoder(f)
err=en.Encode(students)
if err!=nil {
log.Fatal(err)
}
}
func loadJsonFile(){
f,err:=os.Open("students.json")
if err!=nil {
log.Fatal(err)
}
defer f.Close()
dec:=json.NewDecoder(f)
ss:=make([]Student,ALL)
err=dec.Decode(&ss)
if err!=nil {
log.Fatal(err)
}
// log.Println(ss)
}
func toGobFile(){
f,err:=os.OpenFile("students.gob",os.O_RDWR ,0600)
if err!=nil {
log.Fatal("Can't open students.gob "+ err.Error())
}
defer f.Close()
en:=gob.NewEncoder(f)
err=en.Encode(students)
if err!=nil {
log.Fatal(err)
}
}
func loadGobFile(){
f,err:=os.Open("students.gob")
if err!=nil {
log.Fatal(err)
}
defer f.Close()
dec:=gob.NewDecoder(f)
ss:=make([]Student,ALL)
err=dec.Decode(&ss)
if err!=nil {
log.Fatal(err)
}
// log.Println(ss)
}
func toXmlFile(){
f,err:=os.OpenFile("students.xml",os.O_RDWR ,0600)
if err!=nil {
log.Fatal(err.Error())
}
defer f.Close()
en:=xml.NewEncoder(f)
err=en.Encode(students)
if err!=nil {
log.Fatal(err)
}
}
func loadXmlFile(){
f,err:=os.Open("students.xml")
if err!=nil {
log.Fatal(err)
}
defer f.Close()
dec:=xml.NewDecoder(f)
ss:=make([]Student,ALL)
err=dec.Decode(&ss)
if err!=nil {
log.Fatal(err)
}
// log.Println(ss)
}
func main(){
start:=time.Now()
toJsonFile()
loadJsonFile()
end:=time.Now()
log.Printf("Serialization by JSON elapsed: %d us",end.Sub(start)/1000)
fi,err:=os.Stat("students.json")
if err!=nil {
log.Fatal(err)
}
log.Println(fi.Name(), fi.Size())
start=time.Now()
toGobFile()
loadGobFile()
end=time.Now()
log.Printf("Serialization by GOB elapsed: %d us",end.Sub(start)/1000)
fi,err=os.Stat("students.gob")
if err!=nil {
log.Fatal(err)
}
log.Println(fi.Name(), fi.Size())
start=time.Now()
toXmlFile()
loadXmlFile()
end=time.Now()
log.Printf("Serialization by XML elapsed: %d us",end.Sub(start)/1000)
fi,err=os.Stat("students.xml")
if err!=nil {
log.Fatal(err)
}
log.Println(fi.Name(), fi.Size())
}
Go的哪個版本？ – OneOfOne
go版本go1。6 linux/amd64 – zhannk
如果您想測量（反）序列化的速度，請勿寫入磁盤。除此之外：什麼是問題？ – Volker