Redmine

env = (<<'EOS')

  require "bundler/inline"

  gemfile(false) do

    source "https://rubygems.org"

    gem "rails", '5.2.3'

    gem "get_process_mem", "0.2.4"

    gem "sys-proctable", "1.1.5" if Gem.win_platform?

    gem "memory_profiler", "0.9.14" if profile

  end

  require 'benchmark'

  require 'get_process_mem'

  profile ||= false

  MemoryProfiler.start if profile

  result = Benchmark.measure { test }

  profile = MemoryProfiler.stop if profile

  puts "benchmark #{name}, mem: #{GetProcessMem.new.mb}mb, time: #{result.total}s"

  if profile

    profile_name = "profile_#{name}_#{Process.pid}.txt"

    puts "Profile written to: #{profile_name}"

    profile.pretty_print(to_file: profile_name)

  end

EOS

new = <<-RUBY

  def test

    require 'rails'

    require 'active_model/railtie'

    require 'active_job/railtie'

    require 'active_record/railtie'

    require 'active_storage/engine'

    require 'action_controller/railtie'

    require 'action_mailer/railtie'

    require 'action_view/railtie'

    require 'action_cable/engine'

    # require 'sprockets/railtie'

    require 'rails/test_unit/railtie'

  end

RUBY

old = <<-RUBY

  def test

    require 'rails/all'

  end

RUBY

(ENV['ITERATIONS'] || 10).to_i.times do

  ['new', 'old'].each do |name|

    pid = Process.spawn(RbConfig.ruby, "-eprofile=#{!!ENV['PROFILE']};name='#{name}';#{eval(name)}#{env}")

    Process.wait pid

  end

end