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

#define BUFSIZE 10240
#define APSIZE 16000

/*******************************************************

   basically hogs memory and continually modifies the memory it
   has to put load on the kernel and the page swapping section

 *******************************************************/

void reverse(char *string,int length);
void fill(char *string,int length);
void hex_dump(char *ptr,int size,int rowsize);

main()
{
	char reserve[BUFSIZE];
	char *mp,*ap[APSIZE];
	int i = 0;
	int max;
	mp = malloc(BUFSIZE);
	while ((mp != NULL) && (i < APSIZE)) {
		ap[i] = mp;
		i++;
		mp = malloc(BUFSIZE);
	}

	max = i - 1;

	printf("finished allocating, %d slots used\n",max);
	
	for (i = 0; i <= max; i++) {
		fill(ap[i],BUFSIZE);
	}

	printf("finished filling ...\n");
	
	for (i = 0; i <= max; i++) {
		reverse(ap[i],BUFSIZE);
	}

	printf("finished reversing ...\n");
	
	{
		int cur = 0,next = max;

		while (1) {
			if ((next > max) || (next < 0))
				next = max;
			if ((cur > max) || (cur < 0))
				cur = 0;
			memcpy(ap[cur],reserve,BUFSIZE);
			memcpy(ap[next],ap[cur],BUFSIZE);
			memcpy(reserve,ap[next],BUFSIZE);

			printf("finished one loop of copy ...\n");

			cur++;
			next--;
		}
	}
}

void hex_dump(char *ptr,int size,int rowsize)
{
        int i = 0;
        while (i < size) {
                if (isprint(*ptr)) {
                        printf("%c ",*ptr);
                } else {
                        printf("%02.2x",(*ptr & 0xff));
                }
                if ((i % rowsize) == (rowsize - 1)) {
                        putchar('\n');
                } else {
                        putchar(' ');
                }
                i++;
                ptr++;
        }
	putchar('\n');
}

void fill(char *string,int length)
{
	int i;
	for (i = 0; i < length; i++) {
		string[i] = (unsigned  char)((i + 101) & 0xff);
	}
}
void reverse(char *string,int length)
{
        int i;
        int max;
        char tmp;

        max = length / 2;

        for (i = 0; i < max; i++) {
                tmp = string[i];
                string[i] = string[length - 1 - i];
                string[length - 1 - i] = tmp;
        }
}