Here is a good comparison of Resque and Sidekiq. Resque vs Sidekiq?
Sidekiq uses threads, so there is significantly less memory than a Resque or delayed job. a flaw and a huge one, I think your employees SHOULD be thread safe, including any gems that you use in them. checking all the code that goes to workers to ensure thread safety is confident, as it can potentially debug competition in lower levels of libs, seg faults, etc.
ron pastore
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