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timetest.cc

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#include "timer.hh"


#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>

#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>


extern "C" void quittimetest ();

int quit_timetest_flag = 0;

static void
quittimetest (int sig)
{
  quit_timetest_flag = 1;
}

double period = 0.001;

#define MAX_HIST 10000
int hist[MAX_HIST];

#ifdef VXWORKS
extern "C" int timetest ();

int
timetest ()
#else
int
main (int argc, char **argv)
#endif
{

  int count = 0;
  int hist_index;
  int lo_hist_index = MAX_HIST;
  int hi_hist_index = 0;
  double start_time, end_time;
  double avg_time, total_time;
  double min_time = 1E99;
  double max_time = -1E99;
  double last_time;

  if (argc > 1)
    {
      period = strtod (argv[1], 0);
    }
  signal (SIGINT, quittimetest);
  start_time = etime ();
  last_time = start_time;

  for (int i = 0; i < MAX_HIST; i++)
    {
      hist[i] = 0;
    }

  last_time = etime ();
  esleep (period);
  while (!quit_timetest_flag)
    {
      count++;
      double cur_time = etime ();
      double diff = (cur_time - last_time);
      if (min_time > diff)
        {
          min_time = diff;
        }
      if (max_time < diff)
        {
          max_time = diff;
        }
      hist_index = ((int) (sqrt (MAX_HIST) * diff / period));
      if (hist_index < 0)
        {
          hist_index = 0;
        }
      if (hist_index > MAX_HIST - 1)
        {
          hist_index = MAX_HIST - 1;
        }
      if (hi_hist_index < hist_index)
        {
          hi_hist_index = hist_index;
        }
      if (lo_hist_index > hist_index)
        {
          lo_hist_index = hist_index;
        }
      hist[hist_index]++;
      if (count % ((int) (5.0 / period)) == 0 || period > 5.0)
        {
          total_time = (cur_time - start_time);
          avg_time = count > 0 ? total_time / count : -1;
          printf
            ("count: %d min_time:%f max_time:%f total_time:%f avg_time: %f\n",
             count, min_time, max_time, total_time, avg_time);
        }
      last_time = cur_time;
      esleep (period);
    }

  end_time = etime ();
  total_time = end_time - start_time;
  avg_time = count > 0 ? total_time / count : -1;
  printf ("count: %d min_time:%f max_time:%f total_time:%f avg_time: %f\n",
          count, min_time, max_time, total_time, avg_time);
  printf ("\n\n");
  printf ("time:%f\n", total_time);
  printf ("count:%d\n", count);
  if (count > 0)
    {
      printf ("period:%f\n", total_time / count);
    }
  if (total_time > 0.0)
    {
      printf ("frequency:%f\n", count / total_time);
    }

  printf ("\n\nHistogram:\n");
  printf ("Period    \tCount  \tPercent\n");
  for (int i = lo_hist_index; i <= hi_hist_index; i++)
    {
      if (i > lo_hist_index + 2 && i < hi_hist_index - 1 && hist[i] == 0
          && hist[i - 1] == 0 && hist[i + 1] == 0)
        {
          if (hist[i - 2] != 0)
            {
              printf (" . . . \n");
            }
          continue;
        }
      printf ("%6.6f \t%6.6d \t%6.6f%\n", period / sqrt (MAX_HIST) * i,
              hist[i], 100 * ((double) hist[i] / count));;
    }
  printf ("\n");


#ifdef VXWORKS
  return (0);
#endif
}

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