Initial version

code/test/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 */
+}