discourse/discourse — pull request #1309 by stephankaag (2013-08-07 17:28:04+00:00)
Title: Replace Clockwork with Sidetiq

"We should eliminate clockwork, its just wasting memory for no reason, https://github.com/tobiassvn/sidetiq8 seems like a reasonable replacement that can run inside sidekiq."
http://meta.discourse.org/t/unbound-memory-usage/8137/6

Here you go!