Measure execution time in C (for Linux and Windows)
main.c
main-vs.c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
// beginning timestamp
struct timespec begin;
timespec_get(&begin, TIME_UTC);
struct timespec begin2;
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &begin2);
int x = 15;
for (long long i = 0; i < 1000000; i++) {
x *= 2;
printf("Test\n");
}
// sleep(2);
// ending timestamp
struct timespec end;
timespec_get(&end, TIME_UTC);
struct timespec end2;
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end2);
// display the difference between the 2 timestamps
double time_spent = (end.tv_sec - begin.tv_sec) + (end.tv_nsec - begin.tv_nsec) / 1000000000.0;
double time_spent2 = (end2.tv_sec - begin2.tv_sec) + (end2.tv_nsec - begin2.tv_nsec) / 1000000000.0;
printf("Time it took to execute (WALL TIME): %lf\n", time_spent);
printf("Time it took to execute (CPU TIME): %lf\n", time_spent2);
return 0;
}