We use redis because we use resque extensively for the push notifications architecture. Memcache is superior to redis for simple caching in front of data sources.
Any reason why you haven't tried using Sidekiq, which is much more efficient in terms of using memory resources? Or is Resque just good enough for now?
Hm, well Sidekiq wasn't out when we started developing. :) Memory has never been a constraint for us with resque though. The only problems we've had with it have been things like improper signal handling, pretty easy to deal with.
