swoole http server 整合 phalcon，ab测试，报php内存耗尽

Question

在整合swoole http server和phalcon，server.php如下：

<?php

use Phalcon\DI;
use Phalcon\Loader;
use Phalcon\Mvc\Router;
use Phalcon\Mvc\Dispatcher;
use Phalcon\Http\Response;
use Phalcon\Http\Request;
use Phalcon\Mvc\View;
use Phalcon\Db\Adapter\Pdo\Mysql as Database;
use Phalcon\Mvc\Application as BaseApplication;
use Phalcon\Mvc\Model\Metadata\Memory as MemoryMetaData;
use Phalcon\Mvc\Model\Manager as ModelsManager;

class Application extends BaseApplication
{

    protected function registerAutoloaders()
    {

        $loader = new Loader();

        $loader->registerDirs(array(
            '../apps/controllers/',
            '../apps/models/'
        ));

        $loader->register();
    }

    /**
     * This methods registers the services to be used by the application
     */
    protected function registerServices()
    {

        $di = new DI();

        //Registering a router
        $di->set('router', function(){
            return new Router();
        });

        //Registering a dispatcher
        $di->set('dispatcher', function(){
            return new Dispatcher();
        });

        //Registering a Http\Response
        $di->set('response', function(){
            return new Response();
        });

        //Registering a Http\Request
        $di->set('request', function(){
            return new Request();
        });

        //Registering the view component
        $di->set('view', function(){
            $view = new View();
            $view->setViewsDir('../apps/views/');
            return $view;
        });

        $di->set('db', function(){
            return new Database(array(
                "host" => "localhost",
                "username" => "root",
                "password" => "",
                "dbname" => "invo"
            ));
        });

        //Registering the Models-Metadata
        $di->set('modelsMetadata', function(){
            return new MemoryMetaData();
        });

        //Registering the Models Manager
        $di->set('modelsManager', function(){
            return new ModelsManager();
        });

        $this->setDI($di);
    }

    public function main()
    {
        $this->registerServices();
        $this->registerAutoloaders();
    }
}

$application = null;

$http = new swoole_http_server("0.0.0.0", 9501);

$http->on('request', function ($request, $response) {
    try {
        $_GET = $_POST = $_COOKIE = $_REQUEST = [];

        if (!empty($request->get)) {
            $_GET = $request->get;
            $_REQUEST += $_GET;
        }

        if (!empty($request->post)) {
            $_POST = $request->post;
            $_REQUEST += $_POST;
        }

        if (!empty($request->cookie)) {
            $_COOKIE = $request->cookie;
        }

        global $application;
        $html = $application->handle($request->server['request_uri'])->getContent();
        $response->end($html);
    } catch (\Exception $e){
        print_r($e);
        echo $e->getMessage();
    }
});

$http->on('WorkerStart', function($server, $workerId) {
    global $application;
    $application = new Application();
    $application->main();
});
# 启动服务器
$http->start();

浏览器访问没什么问题
做ab测试就报错了

ab -n 10000 -c 1000 -rk http://phalcon.com/

错误信息：

[root@localhost public]# [2016-08-25 17:12:45 *12502.0]    ERROR    zm_deactivate_swoole (ERROR 103): Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 16384 bytes) in /srv/www/single/public/server.php on line 126.
[2016-08-25 17:12:45 $12497.0]    WARNING    swManager_check_exit_status: worker#0 abnormal exit, status=255, signal=0

请教这是什么原因导致的，是onRequest那里写的不对吗？

Answer 1

这个问题，目前我还没找到答案，说下目前的情况
这个是有人写的一个demo：https://github.com/yekongmei/...
这个我测了，在ab -n 10000 -c 1000 -kr http://phalcon.com/这样的测试下，可以做大概7-8轮测试，然后也报

PHP Fatal error:  Allowed memory size of 268435456 bytes exhausted (tried to allocate 16384 bytes) in /srv/www/single/public/server.php on line 56

特别是配置这里：

$http->set(array(
    'worker_num' => 4,
    'daemonize' => true,
    'max_request' => 100000,
    'dispatch_mode' => 1
));

如果注释掉，也就只能跑一轮，第二次就也报内存不够的问题了
继续探究吧，我也再问问

---

2016-09-30 18:25:18 更新
现在找到了问题所在，是控制器里面返回内容所用的方式引起的：

public function indexAction()
{
    return "hello world"; //这种会导致报Allowed memory exhausted
}
public function indexAction()
{
    echo "hello world"; //这种不会
}

这两种都能正常打印hello world。
看起来应该是return回去的内容，导致$html没有释放掉？暂时这么猜的，我想看内存里面哪个变量没有释放，但没找到看php的内存变量的方法，有知道的贴个答案。

Answer 2

看起来$application 是一个单例，那么内部状态应该会有冲突吧

Answer 3

感觉像是global $application;的缘故，可以建议对于公用的东西走单例模式

Answer 4

$http->on('WorkerStart', function($server, $workerId) {
    global $application;
    $application = new Application();
    $application->main();
});

修改成为

$http->on('WorkerStart', function($server, $workerId) {
    $server->application = new Application();
    $server->application->main();
});

之后你都可以使用 $server->application来访问Application对象了。

如果已上方法你不想这样做，请修改onrequest方法：

$http->on('request', function ($request, $response) {
    try {
        //你的代码
        global $application;
        $html = $application->handle($request->server['request_uri'])->getContent();
        $response->end($html);
    } catch (\Exception $e){
        print_r($e);
        echo $e->getMessage();
    } finally{
        unset($application);
    }
});

Answer 5

估计是因为php.ini的 memory_limit = 256M 限制导致 Swoole 遇到内存不足:
Fatal error: Allowed memory size of 268435456 bytes exhausted
建议分配512MB或者更大.并发越大,Swoole每个工作进程占用的内存也越多.

Answer 6

使用swoole，就会出现内存泄漏的问题，建议拉个进程实时监控内存使用情况，内存达到一定量就重启进程

Answer 7

建议拉个进程实时监控内存使用情况