C与PHP速度对照
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
- C实现
- PHP实现
- 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++) { data[i] = rand()%10000+1; } int j,temp; for(i=0;i<length;i++) { for(j=0;j<length-1-i;j++) { if(data[j] > data[j+1]) { temp = data[j]; data[j] = data[j+1]; data[j+1] = temp; } } } /* for(i=0;i<length;i++) { 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; }
2.PHP
<?php $start_time =microtime(true); $data =array(); for($i=0; $i<3000; $i++) { array_push($data,rand(0,10000)); } // var_dump($data); $temp; for($i=0;$i<count($data);$i++) { for($j=0;$j<count($data)-1-$i;$j++) { if($data[$j] > $data[$j+1]) { $temp = $data[$j]; $data[$j] = $data[$j+1]; $data[$j+1] = $temp; } } } // var_dump($data); $end_time =microtime(true); $time = $end_time-$start_time; echo "use time:" ,$time;
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++) { 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++) { for(j=0;j<count-1-i;j++) { if(data[j] > data[j+1]) { temp = data[j]; data[j] = data[j+1]; data[j+1] = temp; } } } for(i=0;i<count;i++) { php_printf("%d\n",data[i]); } }
然后在PHP里调用
<?php $start_time =microtime(true); $data =array(); for($i=0; $i<3000; $i++) { $data[$i]=rand(0,10000); } echo bubble($data); $end_time =microtime(true); $time = $end_time-$start_time; echo "use time:" ,$time;
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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