benchmark_ips.rb

# This is not a very beautiful code, but it's just an example...
# And it kinda works...
require 'benchmark/ips'
Rails.application.config.after_initialize do
  Rails.application.extend Module.new {
    def call(e)
      super
      p before: GC.stat
      # RUBY_GC_HEAP_INIT_ SLOTS=1000000 + GC.disable
      Benchmark.ips do |x|
        x.report('Rails.application#call') do
          super
        end
      end
      p before: GC.stat
      super # メモ：2回super呼ぶ？
    end
  }
end