测试操作系统缓存

// TestUnsigned.cpp : Defines the entry point for the console application.

//


#include "stdafx.h"
#include <time.h>

#define DUMBCOPY for(i=0; i<65536; i++) \
    dest[i] = src[i]

#define SMARCOPY memcpy(dest,src,63336)

int _tmain(int argc, _TCHAR* argv[])
{

    TCHAR src[65536];
    TCHAR dest[35536];
    int i,j;

    clock_t begin;
    clock_t end;

    begin = clock();
    for (j=0;j<1000;j++)
    {
        //SMARCOPY;

        DUMBCOPY;
    }
    end=clock();

    printf("%d\n",end-begin);
    return 0;
}



 

发现使用SMARCOPY所用的时间明显比DUMBCOPY的时间多