Hi, I am having the same problem with Zend_Cache_Backend_File. I have less cache files than Ralf but when the cache is cleaned with CLEANING_MODE_MATCHING_TAG it takes a long time, more than 20 seg.
I was reading this thread and I would not like to change to Zend_Cache_Backend_SQLite. Does anybody know what happen?, Why does it take a long time? If this performance is normal, I suppose that the Zend_Cache_Backend_File is unusable. Greeting. Thanks. Cristina. Ralf Eggert wrote: > > Hi everybody, > > I use Zend_Cache with the "Core" Frontend and the "File" backend to > cache results (serialized arrays) of some database selects to files. I > have set the "hashed_directory_level" to 2. > > The cache ids are build from the class name of the model and the method > name which includes the database select. Then all parameters of the > method are added. I use the underscore as a delimiter. Here are some > examples for my cache ids: > > - Destination_Model_Main_fetchSuperiorDestinations_1 > - Member_Model_Main_fetchMembersByDestination_1236_44_future > - Cms_Model_Menu_fetchContextMenu_de_destination_index_update > - Destination_Model_Main_fetchCountPerDestinationAndCategory_44 > > Besides these cache ids every cache file gets an tag similar to the > cache id, but only the main parameter passed to the method is used. For > my examples above the tags are: > > - Destination_Model_Main_fetchSuperiorDestinations_1 > - Member_Model_Main_fetchMembersByDestination_1236 > - Cms_Model_Menu_fetchContextMenu_de > - Destination_Model_Main_fetchCountPerDestinationAndCategory_44 > > Now here is my problem. I have 10.000 and even many more cache files in > my data cache directory. They are separated into the 2-level directory > structure which Zend_Cache provides. Now when something happens that > needs a cache clearung (e.g. new forum post), the clearing of all cache > files for a specific tag takes a very long time (sometimes > 10 seconds). > > I guess this is due to the fact, that Zend_Cache needs to read the whole > structure of my cache directory to identify all files with the specific > tag. Can someone confirm this? How can I improve my setup to solve this > performance issues? > > One idea was to create one cache object for each class-method > combination (I have about 30 of these combinations) to minimize the > number of files that need to be accessed to find all cache files for a > specific tag. But I am not sure if this is the best solution. > > Is Zend_Cache able to derive the directory structure from the cache id? > If yes, how? > > I hope all of this doesn't sound too confusing and I am looking forward > for any help. > > Thanks and Best regards, > > Ralf > > -- View this message in context: http://www.nabble.com/Optimize-Zend_Cache-clearing-tp16809942p21128282.html Sent from the Zend Framework mailing list archive at Nabble.com.
