int main(void) {
double clockticks, cticks;
clock_t tcend, tcstart;
struct tms tmend, tmstart;
if ((clockticks = (double) sysconf(_SC_CLK_TCK)) == -1) {
perror("Failed to determine clock ticks per second");
return 1;
}
printf("The number of ticks per second is %f\n", clockticks);
if (clockticks == 0) {
fprintf(stderr, "The number of ticks per second is invalid\n");
return 1;
}
if ((tcstart = times(&tmstart)) == -1) {
perror("Failed to get start time");
return 1;
}
function_to_time();
if ((tcend = times(&tmend)) == -1) {
perror("Failed to get end times");
return 1;
}
cticks = tmend.tms_utime + tmend.tms_stime
- tmstart.tms_utime - tmstart.tms_stime;
printf("Total CPU time for operation is %f seconds\n", cticks/clockticks);
if ((tcend <= tcstart) || (tcend < 0) || (tcstart < 0)) {
fprintf(stderr, "Tick time wrapped, couldn't calculate fraction\n");
return 1;
}
printf("Fraction of CPU time used is %f\n", cticks/(tcend - tcstart));
return 0;
}
int main(void) {
// time_t start_time, end_time;
// time_t elapsed_time;
struct timeval start_time, end_time;
long elapsed_time;
if (gettimeofday(&start_time,0)) {
fprintf(stdout,"Failed to get start time.\n");
return 1;
}
int i =0;
// for (i=0;i<ITERATION;i++)
function_to_time();
if (gettimeofday(&end_time,0)) {
fprintf(stdout,"Failed to get end time.\n");
return 1;
}
// elapsed_time = end_time - start_time;
elapsed_time = MILLION*(end_time.tv_sec - start_time.tv_sec) + end_time.tv_usec - start_time.tv_usec;
printf("The time taken is: %ld us \n",elapsed_time);
return 0;
}
int main(void) {
time_t tend, tstart;
tstart = time(NULL);
function_to_time();
tend = time(NULL);
printf("The time before was %sThe time after was %s",
ctime(&tstart), ctime(&tend));
return 0;
}
