On 02/05/2008 07:45 PM, Dirk-Willem van Gulik wrote: > Caching experts -- why do memcache and diskcache have seemingly quite > different caching strategies when it comes to storing the headers ? E.g. > the cache_object_t * is populated with the status/date/etc data in > memcache - but not in disk-cache. Is this work in progress or subtle > design ?
But mod_mem_cache never restores the status (see comment mod_cache.c:288) :-). I think the difference is because cache_object_t is the data structure that mod_mem_cache actually stores in the cache to keep this data (in fact a pointer to the cache_info data) around whereas mod_disk_cache serializes the cache_info from cache_object_t data and writes it to disk. Once mod_disk_cache reads back the data from the disk it populates the cache_info field in cache_object_t again with the deserialized data (see open_entity and file_cache_recall_mydata). > > I am trying to understand (got a working mod_memcached_cache.c* -- and > cannot quite get the right VARY behaviour). As others mentioned mod_mem_cache did not receive the same love as mod_disk_cache. So I am not quite sure if VARY even works correctly with mod_mem_cache. Regards Rüdiger
