Laravel 守护进程队列内存泄漏

Question

我正在使用 Laravel 5.1 并使用 Supervisor 来监视队列作业。队列驱动程序是数据库。

[program:queue]
process_name=%(program_name)s_%(process_num)02d
command=php /var/www/html/artisan queue:work database --sleep=3 --tries=1 --daemon
autostart=true
autorestart=true
user=root
numprocs=1
redirect_stderr=true
stdout_logfile=/var/www/html/storage/logs/supervisord.log

队列监听器使用的 RAM 在处理每个作业后会增加，达到 150-200 MB。所有全局变量都分配为 null。

namespace App\Jobs;
use App\Jobs\Job;
use App\Compatibility;
use App\Like;
use App\Message;
use Illuminate\Queue\SerializesModels;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Contracts\Bus\SelfHandling;
use Illuminate\Contracts\Queue\ShouldQueue;

class CalculateInteractionLike extends Job implements SelfHandling, ShouldQueue
{
    use InteractsWithQueue, SerializesModels;
    protected $userAId;
    protected $userBId;
    protected $gender;

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct($userAId, $userBId, $gender)
    {
        $this->userAId = $userAId;
        $this->userBId = $userBId;
        $this->gender = $gender;
    }

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        echo 'start CalculateInteractionLike '. memory_get_usage() . "\n";
        $userArray = array();
        Compatibility::where('userAId', $this->userBId)->where('userBId', $this->userAId)->update(['interactionAB'=>0.0001]);
        $profiles = Compatibility::where('userAId', $this->userBId)->where('interactionAB', '>',0)->orderBy('compatibilityAB', 'desc')->take(4)->get(['compatibilityAB']);
        $compatible = array();
        for($i=0; $i<sizeof($profiles);$i++){
            $compatible[] = $profiles[$i]->compatibilityAB;
        }
        $std = sizeof($compatible)>1 ? $this->_calculateStd($compatible) : 0;
        $messagedProfile = Message::where('userBId', $this->userBId)->where('type', '1')->get(['userAId']);
        for($i=0;$i<sizeof($messagedProfile);$i++){
            Compatibility::where('userAId',$this->userBId)->where('userBId', $messagedProfile[$i]->userAId)->update(array('interactionAB' => $std));
        }
        $this->userAId = null;
        $this->userBId = null;
        $this->gender = null;
        $userArray = null;
        $profiles = null;
        $compatible = null;
        $std = null;
        $messagedProfile = null;

    }

    private function _calculateStd($compatible){
        return sqrt(array_sum(array_map([$this,"_stdSquare"], $compatible, array_fill(0,count($compatible), (array_sum($compatible) / count($compatible))))) / (count($compatible)-1));
    }

    private static function _stdSquare($x, $mean){
        return pow($x - $mean, 2);
    }

    public function __destruct(){
        $this->cleanup();
        echo 'end CalculateInteractionLike '. memory_get_usage() . "\n";
    }

    public function cleanup() {
        //cleanup everything from attributes
        foreach (get_class_vars(__CLASS__) as $clsVar => $_) {
            unset($this->$clsVar);
        }
    }
}

如果处理上述作业，每次都会增加一些 RAM。有什么想法吗？

Answer 1

作为解决方法 - 如果您找不到内存泄漏的根源 - 您可以切换到

queue:listen

而不使用任何守护进程标志。

这将在每次作业后“重新启动”框架，通过 PHP 释放所有内存。

这与 Supervisor 兼容，这将确保

queue:listen

始终重新启动。

Answer 2

唯一没有清理内存的地方是 for() 内部

        for($i=0;$i<sizeof($messagedProfile);$i++){
            Compatibility::where('userAId',$this->userBId)->where('userBId', $messagedProfile[$i]->userAId)->update(array('interactionAB' => $std));
        }

第一个地方是静态的（::used），但内部创建了对象，并且您开始使用 -> 来调用函数。您是否尝试检查是否有析构函数并手动调用垃圾收集器？

 for($i=0;$i<sizeof($messagedProfile);$i++){
            Compatibility::where('userAId',$this->userBId)->where('userBId', $messagedProfile[$i]->userAId)->update(array('interactionAB' => $std));
            gc_collect_cycles();
        }

第二件事是 where()、update() 等可以返回对象的引用，所以如果是的话你想尝试：

            for($i=0;$i<sizeof($messagedProfile);$i++){
                $tmp = Compatibility::where('userAId',$this->userBId)->where('userBId', $messagedProfile[$i]->userAId)->update(array('interactionAB' => $std));
$tmp = null;
            }

请注意 php < 7.0 is not automatically destruct the objects of the classes that were created inside a upper class. Check this: https://codereview.stackexchange.com/questions/57847/case-of-the-hidden-memory-leak