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!7

module SteadyBeat extends DynBigNumber {
  int interval = 50;
  
  transient long lastTick;
  transient long count, maxDelaySeen, averageSum;
  
  start {
    doEvery(interval, r tick);
    doEvery(showInterval, r show);
  }
  
  void show enter {
    setDescription("MAX/AVG TICK DELAY (TARGET: " + interval + " MS)");
    setValue(maxDelaySeen + "/" + average();
  }
  
  void tick enter {
    long now = sysNow();
    long delay = now-lastTick;
    maxDelaySeen = max(maxDelaySeen, delay);
    ++count;
    averageSum += delay;
  }
  
  // API
  
  long average() {
    ret (averageSum+count/2)/count;
  }
}