프로세스 실행 시간 체크

#include <stdio.h>
#include <unistd.h>
#include <sys/times.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>

int main() {

    int i;
    time_t t;
    struct tms mytms;
    clock_t t1, t2;

    if((t1 = times(&mytms)) == -1){
        perror("times 1");
        exit(1);
    }

    for(i = 0; i< 99999999; i++)
        time(&t);

    if((t2 = times(&mytms)) == -1){
        perror("times 2");
        exit(1);
    }

    printf("Real time : %.1f sec\n", (double)(t2- t1)/ CLK_TCK);
    printf("User time : %.1f sec\n", (double)mytms.tms_utime / CLK_TCK);
    printf("System time : %.1f sec\n", (double)mytms.tms_stime/ CLK_TCK);


    return 0;
}

 

--output--

Real time : 5.3 sec
User time : 5.2 sec
System time : 0.0 sec