If you have read the documentation you probably know that having a Metadata cache for Doctrine is something you really want to have in production.

The setup in Symfony is pretty easy, you just have to edit the config_prod.yml:

orm:
    metadata_cache_driver: apc
    query_cache_driver: apc

The problem is that the Dependency Injection Container is generated through the Command Line Interface, and if you do not have apc.enable_cli=1 in your php.ini DIC will use FileCacheReader instead.

You can check your /app/cache/prod/appProdProjectContainer.php to see if you are using APC cache.

    protected function getDoctrine_Orm_DefaultEntityManagerService()
    {
        $a = $this->get('annotation_reader');
        $b = new \Doctrine\Common\Cache\ApcCache();
        $b->setNamespace('sf2orm_default_5cdc3404d84577b226d7772ca9818908');
        $c = new \Doctrine\Common\Cache\ApcCache();
        $c->setNamespace('sf2orm_default_5cdc3404d84577b226d7772ca9818908');
// ...
        $g = new \Doctrine\ORM\Configuration();
        $g->setMetadataCacheImpl($b);
        $g->setQueryCacheImpl($c);
// ...
    }

If you can not find \Doctrine\Common\Cache\ApcCache you are not using APC to cache your metadata.

For a simple page with one query the difference between APC and File based caching can be quite big. Take a look at the numbers I got from XHProf for a simple page:

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