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在这部分代码中,我尝试使用 getrusage 来测量时间:

    getrusage(RUSAGE_SELF, &usage2);
    start2 = usage2.ru_stime;

    int counter;
    for (counter = 0; counter<10000; counter++) {

        int j;
        int found_elements = 0;
        for (j = b; j < c; j++) {
            Node *current = NULL;
            HASH_FIND_INT(mainhash,&j,current);
            if (current) {
                found_elements++;
            }
        }
    }

    getrusage(RUSAGE_SELF, &usage2);
    end2 = usage2.ru_stime;

    printf("%.8f", (double)((end2.tv_sec - start2.tv_sec) + (end2.tv_usec - start2.tv_usec)));

用这些:

    struct rusage usage1, usage2;
    struct timeval start1, end1, start2, end2;

但它在终端上给了我这个:

    112001.00000000

我知道这不是真的。我需要格式为 5.54676686(秒)的经过时间。我怎样才能正确地得到它?

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