docs: def stats_printer(stats_queue):
    """A thread that consumes stats_queue and prints them every 10 seconds."""
    proc_stats = [ProcessStats(i) for i in range(FLAGS.parallel)]
    print_time = start_time = time.time()
    width = 107
  
    running = True
    while running:
      print_time += 10
  
      while time.time() < print_time:
        try:
          s = stats_queue.get(True, print_time - time.time())
          if s is None:  # Signal to print and exit NOW!
            running = False
            break
          proc_stats[s.proc_id] = s
        except queue.Empty:
          pass
  
      replay_stats = ReplayStats()
      for s in proc_stats:
        replay_stats.merge(s.replay_stats)
  
      print((" Summary %0d secs " % (print_time - start_time)).center(width, "="))
      print(replay_stats)
      print(" Process stats ".center(width, "-"))
      print("\n".join(str(s) for s in proc_stats))
      print("=" * width)