mm.c

mm.c

//! gcc -o mm.bin mm.c -W -Wall -O3 -std=gnu99
/* 
 * mm.c
 * 
 * Author:   Makoto Shimazu <[email protected]>
 * URL:      https://amiq11.tumblr.com               
 * License:  2-Clause BSD License                    
 * Created:  2015-12-14                              
 *
 *
 * Copyright (c) 2015, Makoto Shimazu
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright 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.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>

typedef double matrix_t;

matrix_t *matrix_alloc(int nmk) {
  matrix_t *m = malloc(sizeof(matrix_t) * nmk * nmk);
  if (!m) {
    fprintf(stderr, "[%s:%d] allocation failed\n", __func__, __LINE__);
    exit(EXIT_FAILURE);
  }
  return m;
}


void matrix_zero(matrix_t *m, int nmk) {
  for (int i = 0; i < nmk; i++)
    for (int j = 0; j < nmk; j++)
      m[i * nmk + j] = 0;
}

void matrix_set(matrix_t *m, int nmk) {
  for (int i = 0; i < nmk; i++)
    for (int j = 0; j < nmk; j++)
      m[i * nmk + j] = 1.0;
}


double current_sec() {
  struct timeval tv;
  gettimeofday(&tv, NULL);
  return (double)tv.tv_sec + (double)tv.tv_usec * 1.0E-6;
}


int main(int argc, char *argv[]) {
  int nmk = 1024;
  if (argc >= 2)
    nmk = atoi(argv[1]);

  printf("== Matrix Multiplication Test ==\n"
         "Matrix size: %d\n", nmk);

  matrix_t *a = matrix_alloc(nmk);
  matrix_t *b = matrix_alloc(nmk);
  matrix_t *c = matrix_alloc(nmk);
  matrix_set(a, nmk);
  matrix_set(b, nmk);
  matrix_zero(c, nmk);

  double before_sec = current_sec();
  for (int i = 0; i < nmk; i++)
    for (int j = 0; j < nmk; j++)
      for (int k = 0; k < nmk; k++)
        c[i * nmk + j] += a[i * nmk + k] * b[k * nmk + j];
  double after_sec = current_sec();

  double flops = 2.0 * nmk * nmk * nmk;
  printf("Elapsed [ms]: %.2f\n"
         "Flops [GFLOPS]: %.2f\n",
         (after_sec - before_sec) * 1E3,
         flops / (after_sec - before_sec) * 1E-9);
  return 0;
}