@Test public void debugLogger(){
  final Timer timer=new Timer("DebugLogger",LOOP_CNT * THREADS);
  final Runnable runnable=new DebugLoggerRunnable();
  final ExecutorService pool=Executors.newFixedThreadPool(THREADS);
  timer.start();
  for (int i=0; i < THREADS; ++i) {
    pool.execute(runnable);
  }
  pool.shutdown();
  timer.stop();
  System.out.println(timer.toString());
}