Doctrine2 doc recommends Apc/Memcache/Xcache for both metadata cache and query cache [reference]. However, we cannot use Apc or Xcache because we are using zend optimizerPlus. They don't work together at the moment. I'd prefer to not use Memcache as well because it involves network time (we have multiple dedicated memcache servers).
Do any of you guys have production experience of using \Doctrine\Common\Cache\FilesytemCache for doctrine? As linux OS will cache these cache files in memory, I feel it should be good enough before we can use apc/xcache with zend optimizer+ (hopefully in php 5.5). But any suggestion will be appreciated.