Java, Python, Ruby, PHP, C等语言性能对比
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
代码性能对比图
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
内存对比图：
测试源码：
C (source); Result: C gcc (Debian 4.4.4-1) 4.4.4
#include #include #include #include int main(){setbuf(stdout,NULL); //disable output bufferingchar *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
#include #include #include using namespace std;main (){
string str = "abcdefgh";
str += "efghefgh";
int imax = 1024 /str.length() * 1024 *4;
time_t currentTime = time(NULL);
cout
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