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matmult.c

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/* matmult.c 
 *    Test program to do matrix multiplication on large arrays.
 *
 *    Intended to stress virtual memory system.
 *
 *    Ideally, we could read the matrices off of the file system,
 *      and store the result back to the file system!
 */

#include "syscall.h"

#define Dim     20      /* sum total of the arrays doesn't fit in 
                         * physical memory 
                         */

int A[Dim][Dim];
int B[Dim][Dim];
int C[Dim][Dim];

int
main()
{
    int i, j, k;

    for (i = 0; i < Dim; i++)           /* first initialize the matrices */
        for (j = 0; j < Dim; j++) {
             A[i][j] = i;
             B[i][j] = j;
             C[i][j] = 0;
        }

    for (i = 0; i < Dim; i++)           /* then multiply them together */
        for (j = 0; j < Dim; j++)
            for (k = 0; k < Dim; k++)
                 C[i][j] += A[i][k] * B[k][j];

    Exit(C[Dim-1][Dim-1]);              /* and then we're done */
}

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