* aggressively flush cache based on cache size * find_older_frozen_slots -> cached_frozen_slots * remove 'WRITE_CACHE_LIMIT_BYTES_DEFAULT' * tweaks to stats * fix tests
* aggressively flush cache based on cache size * find_older_frozen_slots -> cached_frozen_slots * remove 'WRITE_CACHE_LIMIT_BYTES_DEFAULT' * tweaks to stats * fix tests