Multicore Software Development Techniques

Appendix A

Source Code Examples

Matrix Multiply – Naïve Version (Not Cache Friendly)

1 /* mm.c */

2  

3 //

4 // My Matrix Multiplication app

5 //

6 // Uses standard triply-nested loop, not cache-friendly.

7 //

8  

9 // Usage:

10 // mm [-?] [-n MatrixSize] [-t NumThreads]

11 //

12 #define LINUX

13 // #define WINDOWS

14  

15 #include  <stdio.h>

16 #include  <stdlib.h>

17 #include  <string.h>

18 #include  <math.h>

19 #include  <time.h>

20  

21 #ifdef LINUX

22 #include <sys/time.h>

23 #endif

24  

25 #include "pthread.h"

26  

27  

28 //

29 // Function prototypes:

30 //

31 double **MatrixMultiply(double** A, double** B, int N, int numthreads);

32 void _SequentialMM(double** C, double** A, double** B, int N);

33 void _ParallelMM(double** C, double** ...