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Track counts and compute rate of iteration. Set up callbacks for various intervals such as every n increments or every n ticks. computer = Cadence::Computer.new do |c| c.every 5 do p [:completed_processing, n] end end computer.start do |c| 1.upto(100) do |n| c.next # do magic here end end Mostly intended for providing intermitent feedback of the progress of tasks that will run for lengthy periods of time. Rudimentary support for time-based callbacks is possible through #ticks.