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Our priority hierarchy is: (1) Tornado and base services like memcached, redis, etc. (2) Django and message sender queue workers. (3) Everything else. Ideally, we'd have something a bit more fine-grained (e.g. some queue workers are potentially in the sending path, while others aren't), but this should have a big impact on ensuring Tornado gets the resources it needs during load spikes. I think this has a good chance of causing some load spikes that would previously have resulted in a user-facing delivery delays no longer having any significant user-facing impact.