swoole服务只起一个进程吗

<?php

class Server
{
    private $serv;

    public function __construct() {
        $this->serv = new swoole_server("0.0.0.0", 9502);
        $this->serv->set([
            &#39;worker_num&#39;      => 3,
            &#39;task_worker_num&#39; => 3,
        ]);
        $this->serv->on(&#39;Start&#39;, function ($serv) {
            echo "SWOOLE:".SWOOLE_VERSION . " 服务已启动".PHP_EOL;
            echo "SWOOLE_CPU_NUM:".swoole_cpu_num().PHP_EOL;
        });
        $this->serv->on(&#39;Receive&#39;, function ($serv, $fd, $from_id, $data) { });
        $this->serv->on(&#39;Task&#39;, function ($serv, $task) { });
        $this->serv->on(&#39;Finish&#39;, function ($serv, $task_id, $data) {});
        $this->serv->start();
    }
}
$server = new Server();