Clocking proccesses' time

babis85_at_gmail.com
Date: 11/27/05

  • Next message: Mr. Uh Clem: "Re: effective user id" 
    Date: 27 Nov 2005 13:21:54 -0800

    Hello guys, i have this part of code and i want to compute the time of
    processes A, B and C :

    /* process A */
    pid_t pid1, pid2, pid;
    struct rusage ru1, ru2;

    pid1 = fork();
    if (pid != 0) {/* parent process */
           pid2 = fork();
           if (pid2 != 0) {/* parent process */
                   pid = waitpid(-1, &status, 0);
                   getrusage(RUSAGE_CHILDREN, &ru1);
                   waitpid(-1, &status, 0);
                   getrusage(_CHILDREN, &ru2);

                   if (pid == pid1) {
                           printf("B took time...\n", ru1.ru_utime.tv_sec);
                           printf("C took time...\n", ru2.ru_utime.tv_sec);

                   } else {
                           printf("C took time...\n", ru1.ru_utime.tv_sec);
                           printf("B took time...\n", ru2.ru_utime.tv_sec);
                   }
                   getrusage(RUSAGE_SELF, &ru);
                   printf("A took overall time...\n", ru.ru_utime.tv_sec);

           } else {
                   /* process C */
                   execlp(...);
           }

    } else {
           /* process B */
           execlp(...);
    }

    The question is : Do i compute the time of each process successfully?
    I get shorter time for proccess A than for its children... Isn't it
    peculiar?Why?
    I think that the time for proccess B is right, but i wonder if the next
    call of getrusage adds c's time over b's. Do anyone know sth about
    that?
    Thanks a lot...

  • Next message: Mr. Uh Clem: "Re: effective user id"

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