public function onStreamSelectStart($numWorkers)
    {
        $labels = ['worker', 'process'];

        if ($numWorkers > 1) {
            $labels = ['workers', 'processes'];
        }

        $string = sprintf(" Starting %s on $numWorkers %s", $labels[0], $labels[1]);
        $message = $this->color('muted', $string);
        $this->output->writeln($message);
    }