src/jemalloc/test/src/timer.c

   1 #include "test/jemalloc_test.h"
   2
   3 void
   4 timer_start(timedelta_t *timer)
   5 {
   6
   7         gettimeofday(&timer->tv0, NULL);
   8 }
   9
  10 void
  11 timer_stop(timedelta_t *timer)
  12 {
  13
  14         gettimeofday(&timer->tv1, NULL);
  15 }
  16
  17 uint64_t
  18 timer_usec(const timedelta_t *timer)
  19 {
  20
  21         return (((timer->tv1.tv_sec - timer->tv0.tv_sec) * 1000000) +
  22             timer->tv1.tv_usec - timer->tv0.tv_usec);
  23 }
  24
  25 void
  26 timer_ratio(timedelta_t *a, timedelta_t *b, char *buf, size_t buflen)
  27 {
  28         uint64_t t0 = timer_usec(a);
  29         uint64_t t1 = timer_usec(b);
  30         uint64_t mult;
  31         unsigned i = 0;
  32         unsigned j;
  33         int n;
  34
  35         /* Whole. */
  36         n = malloc_snprintf(&buf[i], buflen-i, "%"PRIu64, t0 / t1);
  37         i += n;
  38         if (i >= buflen)
  39                 return;
  40         mult = 1;
  41         for (j = 0; j < n; j++)
  42                 mult *= 10;
  43
  44         /* Decimal. */
  45         n = malloc_snprintf(&buf[i], buflen-i, ".");
  46         i += n;
  47
  48         /* Fraction. */
  49         while (i < buflen-1) {
  50                 uint64_t round = (i+1 == buflen-1 && ((t0 * mult * 10 / t1) % 10
  51                     >= 5)) ? 1 : 0;
  52                 n = malloc_snprintf(&buf[i], buflen-i,
  53                     "%"PRIu64, (t0 * mult / t1) % 10 + round);
  54                 i += n;
  55                 mult *= 10;
  56         }
  57 }