code: public static void main(String[] argv) {
      if (argv.length < 2 || argv.length > 3) {
        System.err.println("Wrong parameters, exit immediately");
        return;
      }
  
      final String zkQuorum = argv[0];
      final String clusterName = argv[1];
      int clientNumber = 1;
      if (argv.length == 3) {
        clientNumber = Integer.parseInt(argv[2]);
      }
  
      for (int i = 0; i < clientNumber; ++i) {
        new Thread() {
          @Override
          public void run() {
            try {
              BenchmarkChronosServer benchmark = new BenchmarkChronosServer(zkQuorum, clusterName);
              benchmark.startBenchmark();
            } catch (IOException e) {
              System.err.println("Error to connect with ZooKeeper or ChronosServer to benchmark");
            }
          }
        }.start();
      }
  
    }
docs: The command-line tool to benchmark ChronosServer and print metrics.
  Usage: mvn exec:java -Dexec.mainClass="com.xiaomi.infra.chronos.benchmark.BenchmarkChronosServer" -Dexec.args="$zkQuorum $clientNumber"
  
  @param argv the first one is zkQuorum and the optional second one is clientNumber