CPU profiling method comparing eager_load VS preload aproaches

compare_cpu.rb

def compare_cpu_general( scope, base_collection_size, nesting)
  ids = scope.ids
  ActiveRecord::Base.logger.silence do
    Benchmark.bmbm do |benchmark|
       benchmark.report("eager_load") do
        50.times do
          # sample(base_collection_size + 1) and limit(base_collection_size) 
          # added to imitate real limit for eager_load, so it would be obligated to use 2 queries instead of one
          # for more read here: https://medium.com/p/5ce11870de62
          scope.where(id: ids.sample(base_collection_size + 1)).limit(base_collection_size).eager_load(nesting).load
        end
      end
      
      benchmark.report("preload") do
        50.times do
          # for the sake of scopes equality
          scope.where(id: ids.sample(base_collection_size + 1)).limit(base_collection_size).preload(nesting).load
        end
      end
    end
  end
end