Closed
Description
Description
After upgrading some projects to PHP 8.1.0 and 8.1.2 we could see requests getting slower and slower over time. Restart of the correspondig fpm-pool fixed that for short. After digging in the problem we could isolate and reproduce it:
- use a Debian 10 or 11 maschine and install php8.1-fpm and php8.1-opcache.
- modify opcache.ini:
zend_extension=opcache.so
[opcache]
opcache.consistency_checks=1
- require laminas:
composer require laminas/laminas-servicemanager - create a test script (we use laminas-servicemanager here):
<?php
declare(strict_types=1);
chdir(dirname(__DIR__));
require 'vendor/autoload.php';
use Laminas\ServiceManager\ServiceManager;
$container = new ServiceManager();
- call that script in a loop 1000 or more times while running htop in another terminal:
for i in {1..10000}; do curl localhost/test.php; done;
You would see an increment usage of memory that will not getting freed after all. Set opcache.consistency_checks to 0 to check that it will not keep any used memory.
PHP Version
8.1.0
Operating System
Debian 10/11