huge.c

/*
 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
 *      The President and Fellows of Harvard College.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */

/* 
 * huge.c
 *
 *      Tests the VM system by accessing a large array (sparse) that
 *      cannot fit into memory.
 *
 * When the VM system assignment is done, your system should be able
 * to run this successfully.
 */

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

#define PageSize        4096
#define NumPages        512

int sparse[NumPages][PageSize]; /* use only the first element in the row */

int
main()
{
        int i,j;

        printf("Entering the huge program - I will stress test your VM\n");

        /* move number in so that sparse[i][0]=i */
        for (i=0; i<NumPages; i++) {
                sparse[i][0]=i;
        }
        
        printf("stage [1] done\n");
        
        /* increment each location 5 times */
        for (j=0; j<5; j++) {
                for (i=0; i<NumPages; i++) {
                        sparse[i][0]++;
                }
                printf("stage [2.%d] done\n", j);
        }
        
        printf("stage [2] done\n");
        
        /* check if the numbers are sane */
        for (i=NumPages-1; i>=0; i--) {
                if (sparse[i][0]!=i+5) {
                        printf("BAD NEWS!!! - your VM mechanism has a bug!\n");
                        exit(1);
                }
        }
        
        printf("You passed!\n");
        
        return 0;
}