Another crack at loading ruby apps faster

gemfile-to-activate.rb

require 'bundler'

parser = Bundler::LockfileParser.new(IO.read("Gemfile.lock"))
gem_activates = parser.specs.map {|s| %Q|gem "#{s.name}", "= #{s.version}"|}

preamble = "#TODO setup gem paths\n"

File.open("activate.rb", "w+") do |f|
  f << preamble
  f << gem_activates.join("\n")
  f << "\n"
end

test-activate.rb

gem "chef", "= 11.10.4"
gem "activesupport", "= 3.2.16"
gem "builder", "= 3.2.2"
gem "chef-zero", "= 1.7.3"
gem "coderay", "= 1.1.0"
gem "diff-lcs", "= 1.2.5"
gem "docile", "= 1.1.2"
gem "erubis", "= 2.7.0"
gem "hashie", "= 2.0.5"
gem "highline", "= 1.6.20"
gem "i18n", "= 0.6.9"
gem "ipaddress", "= 0.8.0"
gem "json", "= 1.8.1"
gem "method_source", "= 0.8.2"
gem "mime-types", "= 1.25.1"
gem "mixlib-authentication", "= 1.3.0"
gem "mixlib-cli", "= 1.4.0"
gem "mixlib-config", "= 2.1.0"
gem "mixlib-log", "= 1.6.0"
gem "mixlib-shellout", "= 1.3.0"
gem "moneta", "= 0.6.0"
gem "multi_json", "= 1.8.4"
gem "net-ssh", "= 2.8.0"
gem "net-ssh-gateway", "= 1.2.0"
gem "net-ssh-multi", "= 1.2.0"
gem "ohai", "= 6.20.0"
gem "pry", "= 0.9.12.6"
gem "puma", "= 1.6.3"
gem "rack", "= 1.5.2"
gem "rake", "= 10.1.1"
gem "rest-client", "= 1.6.7"
gem "rspec", "= 2.14.1"
gem "rspec-core", "= 2.14.7"
gem "rspec-expectations", "= 2.14.5"
gem "rspec-mocks", "= 2.14.5"
gem "rspec_junit_formatter", "= 0.1.6"
gem "simplecov", "= 0.8.2"
gem "simplecov-html", "= 0.8.0"
gem "slop", "= 3.4.7"
gem "systemu", "= 2.5.2"
gem "yajl-ruby", "= 1.2.0"
gem "yard", "= 0.8.7.3"

require 'chef'
__END__
time ruby activate.rb 
ruby activate.rb  0.72s user 0.13s system 99% cpu 0.854 total

test-control.rb

require 'chef'

__END__
time ruby control.rb
ruby control.rb  1.85s user 0.21s system 99% cpu 2.057 total