tally_vs_each.rb

 # report for each
 #  0.007854   0.001874   0.009728 (  0.010521)
 # report for tally
 #  0.782440   0.076243   0.858683 (  0.858839)
  
n=100
Benchmark.bm do |x|

  x.report do
    puts "report for each"
    {}.tap do |metrics|
      Sidekiq::DeadSet.new.each do |job|
        metrics[job.klass] ||= 0
        metrics[job.klass] += 1
      end
    end.sort_by { |key, value| -value }.to_h

  end

  x.report do
    puts "report for tally"
    n.times do
      Sidekiq::DeadSet.new.map(&:klass).tally.sort_by { |key, value| -value }.to_h
    end
  end
end