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