Created
July 23, 2020 08:38
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#include <stdlib.h> | |
#include <stdio.h> | |
#include <time.h> | |
#define n 2048 | |
double A[n][n]; | |
double B[n][n]; | |
double C[n][n]; | |
int main() { | |
//populate the matrices with random values between 0.0 and 1.0 | |
for (int i = 0; i < n; i++) { | |
for (int j = 0; j < n; j++) { | |
A[i][j] = (double) rand() / (double) RAND_MAX; | |
B[i][j] = (double) rand() / (double) RAND_MAX; | |
C[i][j] = 0; | |
} | |
} | |
struct timespec start, end; | |
double time_spent; | |
//matrix multiplication | |
clock_gettime(CLOCK_REALTIME, &start); | |
for (int i = 0; i < n; i++) { | |
for (int j = 0; j < n; j++) { | |
for (int k = 0; k < n; k++) { | |
C[i][j] += A[i][k] * B[k][j]; | |
} | |
} | |
} | |
clock_gettime(CLOCK_REALTIME, &end); | |
time_spent = (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) / 1000000000.0; | |
printf("Elapsed time in seconds: %f \n", time_spent); | |
return 0; | |
} |
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