Java, Python, Ruby, PHP, C等语言性能对比

这篇文章主要讲解Java, Python, Ruby, PHP, C等语言性能对比,通过本文您将了解到Java,Python,Ruby的相关内容,下面开始文章正文。

**代码功能:**循环拼接字符串,并替换子字符串

**硬件环境:**Intel Core2 Duo T7500@2.20Ghz CPU; 2 GB RAM; OS Debian GNU/Linux 2.6.32 i686

### 代码执行时长

![代码运行时长](https://static.oschina.net/uploads/img/201511/14142908_AExs.png)

**代码性能对比图**

![代码性能对比图](https://static.oschina.net/uploads/img/201511/14144357_WZxg.png)

最慢: Java gcj (native executable) 

较慢: Java (openJDK); Java (Sun); Lua 

稍慢: tcl; Javascript (spidermonkey) 

较快: Python; Ruby; PHP; C++; Javascript V8; C; Perl5 

最快的是Perl,最慢的gcj,你能接受吗?

### 内存使用情况

![内存使用情况](https://static.oschina.net/uploads/img/201511/14143131_XRkd.png)

**内存对比图:**

![内存对比图](https://static.oschina.net/uploads/img/201511/14150514_3YBp.png)

### 测试源码:

C (source); Result: C gcc (Debian 4.4.4-1) 4.4.4

~~~.c

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

int main(){

setbuf(stdout,NULL); //disable output buffering

char *str=malloc(8);

strcpy(str,"abcdefgh");

str=realloc(str,strlen(str)+8);

strcat(str,"efghefgh");     //sprintf(str,"%s%s",str,"efghefgh");

int imax=1024/strlen(str)*1024*4;

printf("%s","exec.tm.sec\tstr.length\n"); //fflush(stdout);

time_t starttime=time(NULL);

char *gstr=malloc(0);

int i=0;

char *pos;

int lngth;

char *pos_c=gstr;

int str_len=strlen(str);

    while(i++ < imax+1000){

        lngth=strlen(str)*i;

        gstr=realloc(gstr,lngth+str_len);

        strcat(gstr,str);    //sprintf(gstr,"%s%s",gstr,str);

        pos_c+=str_len;

        pos=gstr;

        while(pos=strstr(pos,"efgh")){

            memcpy(pos,"____",4);

        }

        if(lngth % (1024*256)==0){

            printf("%dsec\t\t%dkb\n",time(NULL)-starttime,lngth/1024); //fflush(stdout);

        }

    }

//printf("%s\n",gstr);

}

~~~

C++ (source) Result: C++ g++ (Debian 4.4.3-7) 4.4.3

~~~.cpp

#include <iostream>

#include <string>

#include <time.h>

using namespace std;

main ()

{

  string str = "abcdefgh";

    str += "efghefgh";

  int imax = 1024 /str.length() * 1024 *4;

  time_t currentTime = time(NULL);

  cout << "exec.tm.sec\tstr.length" << endl;

  string find= "efgh";

  string replace ="____";

  string gstr;

  int i=0;

  int length;

//  int end=0; //  size_t end=0;

  while(i++ < imax +1000){

    gstr += str;

    gstr = gstr;

    size_t start, sizeSearch=find.size(), end=0;

    while((start=gstr.find(find,end))!=string::npos){

        end=start+sizeSearch;

        gstr.replace(start,sizeSearch,replace);

    }

    length = str.length()*i;

    if((length%(1024 * 256))==0){

        cout << time(NULL) - currentTime << "sec\t\t" << length/1024 << "kb" <<  endl;

    }

  }

// cout << gstr << endl;

return 0;

}

~~~

Javascript (source); Results: Javascript (Spidermonkey - Mozilla) 1.8.0 pre-release 1 2007-10-03,

Javascript (V8 - Chrome)

~~~.javascript

#!/usr/local/bin/js

var str = "abcdefgh"+"efghefgh";

var imax = 1024 / str.length * 1024 * 4;

var time = new Date();

print("exec.tm.sec\tstr.length");

var gstr = "";

var i=0;

var lngth;

while (i++ < imax+1000) {

    gstr += str;

    gstr = gstr.replace(/efgh/g, "____");

        lngth=str.length*i;

        if ((lngth % (1024*256)) == 0) {

                var curdate=new Date();

                print(parseInt(((curdate.getTime()-time.getTime())/1000))+"sec\t\t"+lngth/1024+"kb");

        }

}

~~~

Java (source) Results: Java (OpenJDK) "1.6.0 18",

Java (Sun) "1.6.0 16",

Java (gcj) (Debian 4.4.3-1) 4.4.3

~~~.java

public class java_test {

    public static final void main(String[] args) throws Exception {

        String str = "abcdefgh"+"efghefgh";

        int imax = 1024 / str.length() * 1024 * 4;

        long time = System.currentTimeMillis();

        System.out.println("exec.tm.sec\tstr.length\tallocated memory:free memory:memory used");

        Runtime runtime = Runtime.getRuntime();

        System.out.println("0\t\t0\t\t"+runtime.totalMemory()/1024 +":"+ runtime.freeMemory()/1024+":"+(runtime.totalMemory()-runtime.freeMemory())/1024);

        String gstr = "";

        int i=0;

        int lngth;

        while (i++ < imax+1000) {

            gstr += str;

            gstr = gstr.replaceAll("efgh", "____");

            lngth=str.length()*i;

                if ((lngth % (1024*256)) == 0) {

                        System.out.println(((System.currentTimeMillis()-time)/1000)+"sec\t\t"+lngth/1024+"kb\t\t"+runtime.totalMemory()/1024+":"+runtime.freeMemory()/1024+":"+(runtime.totalMemory()-runtime.freeMemory())/1024);

                }

        }

    }

}

~~~

Perl5 (source); Result: This is perl, v5.10.1

~~~.perl

#!/usr/bin/perl

$|=1;    #disable output buffering, this is necessary for proper output through pipe

my $str='abcdefgh'.'efghefgh';

my $imax=1024/length($str)*1024*4;               # 4mb

my $starttime=time();

print "exec.tm.sec\tstr.length\n";

my $gstr='';

my $i=0;

while($i++ < $imax+1000){   #adding 1000 iterations to delay exit. This will allow to capture memory usage on last step

        $gstr.=$str;

        $gstr=~s/efgh/____/g;

        my $lngth=length($str)*$i;   ##     my $lngth=length($gstr);        # Perhaps that would be a slower way

        print time()-$starttime,"sec\t\t",$lngth/1024,"kb\n" unless $lngth % (1024*256); #print out every 256kb

}

~~~

PHP (source); Result: PHP 5.3.1-5 with Suhosin-Patch (cgi-fcgi)

~~~.php

<?php

$str="abcdefgh"."efghefgh";

$imax=1024/strlen($str)*1024*4;      # 4mb

$starttime=time();

print("exec.tm.sec\tstr.length\n");

$gstr='';

$i=0;

while($i++ < $imax+1000){

        $gstr.=$str;

        $gstr=preg_replace('/efgh/','____',$gstr);

        $lngth=strlen($str)*$i;

        if($lngth % (1024*256)==0){

                print (time()-$starttime."sec\t\t".($lngth/1024)."kb\n");

        }

}

?>

~~~

Python3 (source); Result: Python 3.1.3

~~~.python

#!/usr/bin/python3 -u

import re

import time

import sys

str='abcdefgh'+'efghefgh'

imax=1024/len(str)*1024*4   # 4mb

starttime=time.time();

print "exec.tm.sec\tstr.length"

sys.stdout.flush()

gstr=''

i=0

while (i < imax+1000):

        i=i+1

        gstr+=str

        gstr=re.sub('efgh','____',gstr)

        lngth=len(str)*i

        if(lngth % (1024*256) == 0):

                print int(time.time()-starttime),"sec\t\t",(lngth/1024),"kb"

                sys.stdout.flush()

~~~

Ruby (source); Result: ruby 1.8.7

~~~.ruby

#!/usr/bin/ruby

$stdout.sync=true;

str='abcdefgh'+'efghefgh';

imax=1024/str.length*1024*4;       # 4mb

starttime=Time.new;

print("exec.tm.sec\tstr.length\n");

gstr='';

i=0;

while i < imax+1000

        i=i+1;

        gstr+=str;

        gstr=gstr.gsub(/efgh/, "____")

        lngth=str.length*i;

        if(lngth % (1024*256)==0)

                print(((Time.new-starttime).ceil).to_s+"sec\t\t",(lngth/1024).to_s,"kb\n");

        end

end

#puts gstr;

~~~

Lua (source); Result: Lua 5.1.4

~~~.lua

#!/usr/bin/lua

io.stdout:setvbuf "no";             --  io.flush();

str='abcdefgh'..'efghefgh';

imax=1024/string.len(str)*1024*4;         -- 4mb

starttime=os.time();

print "exec.tm.sec\tstr.length";

gstr='';

i=0;

while i < imax+1000 do

        i=i+1;

        gstr=gstr..str;

        gstr=string.gsub(gstr,"efgh","____");

        lngth=string.len(str)*i;

        if(math.mod(lngth,1024*256)==0) then

                print(os.time()-starttime.."sec\t\t"..(lngth/1024).."kb");

        end

end

~~~

tcl (source); Result: tcl 8.4.19

~~~.tcl

#!/usr/bin/tclsh

set str "abcdefgh"

append str "efghefgh"

set imax [expr {1024/[string length $str]*1024*4}]

set starttime [clock clicks -milliseconds]

puts "exec.tm.sec\tstr.length";

set gstr ""

set i 0

while {$i<[expr {$imax+1000}]} {

        incr i

        append gstr $str;

        regsub -all {efgh} $gstr ____ gstr

        set lngth [expr {[string length $str]*$i}]

        if {[expr {$lngth % (1024*256)}] == 0} {

                puts "[expr int([expr [clock clicks -milliseconds] - $starttime] / 1000)]sec\t\t[expr {$lngth/1024}]kb"

        }

}

exit

~~~

### 结论

各语言随着版本升级,也在不断优化,想要用好每个语言的特性,需要摸透她的脾气,这个需要不断的加深了解。

选语言就像选恋人,情人眼里出西施,你中意的,就是最好的,所以对以上结果别太较真。

转自:http://www.yinqisen.cn/blog-685.html

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