特定内存占用程序

/*usage: cc mem.c -o mem.out 后 使用./mem.out 100 & 消耗对应数字MB单位的内存，释放时杀掉对应进程即可*/

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

 

#define UNIT (1024*1024)

 

int main(int argc, char *argv[])

{

        long long i = 0;

        int size = 0;

 

        if (argc != 2) {

                printf(" === argc must 2 ");

                return 1;

        }

        size = strtoull(argv[1], NULL, 10);

        if (size == 0) {

                printf(" argv[1]=%s not good ", argv[1]);

                return 1;

        }

 

        char *buff = (char *) malloc(size * UNIT);

        if (buff)

                printf(" we malloced %d Mb ", size);

        buff[0] = 1;

 

        for (i = 1; i < (size * UNIT); i++) {

                if (i%1024 == 0)

                        buff[i] = buff[i-1]/8;

                else

                        buff[i] = i/2;

        }

        pause();

}