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C与PHP速度对照

Jun 13, 2016 pm 12:51 PM
data php quot time

C与PHP速度对比

一直就知道PHP是C写的,网上大部分实际应用消耗性能的模块就是由PHP的拓展C来重写的,网上曾经看过百度的一篇大话PHP性能 ,对此文看法很是赞同的。

很早就相对PHP和C进行一个亲测的对比了,无奈当时对于Zend API不了解,现在本文就是亲自来测试一下C与PHP的差距。

我想不好拿什么来测试,于是题目就是对一个大小为3000的数组进行冒泡排序,看时间。

一共分为3种情况

  1. C实现
  2. PHP实现
  3. PHP的C拓展,由PHP产生数组,然后交给C处理数据

1.C实现

#include <stdlib.h>
#include <stdio.h>

#include "time.h"
int main(int arg,char **argv)
{
    clock_t start_time = clock();
    int data[3000];
    int i;
    int length=sizeof(data)/sizeof(int);
    for(i=0; i<length;i&#43;&#43;)
    {
        data[i] = rand()%10000&#43;1;
    }
    int j,temp;
    for(i=0;i<length;i&#43;&#43;)
    {
        for(j=0;j<length-1-i;j&#43;&#43;)
        {
            if(data[j] > data[j&#43;1])
            {
                temp = data[j];
                data[j] = data[j&#43;1];
                data[j&#43;1] = temp;
            }
        }
    }

   /* for(i=0;i<length;i&#43;&#43;)
    {
        printf("%d\n",data[i]); 
    }*/
    clock_t end_time = clock();
    float  time = (double)(end_time-start_time)/CLOCKS_PER_SEC;
    printf("use time: %f",time);
    return 0;
}
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2.PHP

<?php
    $start_time =microtime(true);
    $data =array();
    for($i=0; $i<3000; $i&#43;&#43;)
    {
        array_push($data,rand(0,10000));
    }
//    var_dump($data);
    $temp;
    for($i=0;$i<count($data);$i&#43;&#43;)
    {
        for($j=0;$j<count($data)-1-$i;$j&#43;&#43;)
        {
            if($data[$j] > $data[$j&#43;1])
            {
                $temp = $data[$j];
                $data[$j] = $data[$j&#43;1];
                $data[$j&#43;1] = $temp;
            }
        }
    }
//    var_dump($data);
    $end_time =microtime(true);
    $time = $end_time-$start_time;
    echo "use time:" ,$time;
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3.PHP的C拓展,由PHP产生数组,然后交给C处理数据

PHP_FUNCTION(bubble)
{
	zval *array;
	zval **item;
	if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,"a",&array)==FAILURE)
	{
		return;
	}
    int i;
	int count;
	count = zend_hash_num_elements(Z_ARRVAL_P(array));
  	int j,temp;
	int data[count];
	zend_hash_internal_pointer_reset(Z_ARRVAL_P(array));
    for(i=0;i<count;i&#43;&#43;)
    {	
		zend_hash_get_current_data(Z_ARRVAL_P(array),(void**)&item);

		data[i]=(int)Z_STRVAL_PP(item);
		zend_hash_move_forward(Z_ARRVAL_P(array));
    }
    for(i=0;i<count;i&#43;&#43;)
    {
        for(j=0;j<count-1-i;j&#43;&#43;)
        {
            if(data[j] > data[j&#43;1])
            {
                temp = data[j];
                data[j] = data[j&#43;1];
                data[j&#43;1] = temp;
            }
        }
    }
    for(i=0;i<count;i&#43;&#43;)
    {
		php_printf("%d\n",data[i]);	
	}
}
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然后在PHP里调用

<?php
    $start_time =microtime(true);

    $data =array();
    for($i=0; $i<3000; $i&#43;&#43;)
    {
       $data[$i]=rand(0,10000);
    }

    echo bubble($data);
    $end_time =microtime(true);
    $time = $end_time-$start_time;
    echo "use time:" ,$time;
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经过对此测试

#C与PHP速度的差别

测试手段对一个大小3000的数组进行排序

1.C
use time: 0.090000-0.110000

2.PHP
use time:11.867825984955

3.PHP拓展(C)
use time:0.12569403648376

 

我们可以清楚地看到C比PHP在这个情况下快上100+多倍,PHP的拓展把模块转为C来处理,也同样可以减小差距。

这中间的差距,一方面肯定是PHP与C不同的弱类型变量(PHP的变量在内核里是用zval表示的,里面抽象了7种变量,long,float,obj,array等),还有夸张的函数封装(目测这个很吃性能),导致速度上不去了。

不过这个例子可能没啥代表性,不过我们同样可以了解个大概了。

由此我们可以知道为什么PHP这么多函数都是用C写的了,PHP基本上大部分的外置函数都是采用C来写的,pear和pecl由此应运而生,难怪一个不会写C的PHP程序员不是真的好程序员。

中国PHP界的大牛laruence的Yaf 就是用C写的,传说中速度最快的PHP的Web框架。有机会的真的想研读一下源码。




原文来自独立博客 http://blog.imsuzie.com/archives/573

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