Rails startup time optimization

boot.rb

# Instructions for use
#
# 1. Execute "time rails runner nil" a few times in your shell, see how long rails takes to boot
# 2. Add this monkey patch to the top of config/boot.rb
# 3. Repeat step 1.  What's the difference?
#
# This is just an experiment, but it gains me 30% on Rails' start time, which suggests there is something
# in Rails that is breaking the "run only once" behaviour of #require.
#
# Note: You can't override Kernel#require, since Rails by-passes it most of the time.

class Object
  def require_with_dirty_filthy_hack(path)
    return false if (@@__seen ||= {})[path]
    @@__seen[path] = true
    require_without_dirty_filthy_hack(path)
  end

  alias_method :require_without_dirty_filthy_hack, :require
  alias_method :require, :require_with_dirty_filthy_hack
end

I meant require, wondered why you mentioned it since we're using Rails' autoload and don't require it at all - possibly why it still works.

Ah, I see… yeah, we did a whole bunch of other stuff to prevent gems from loading during Rails startup, so we're requiring the actual gems by hand in some places ;) Il giorno 30/mag/2012, alle ore 16:28, Mal Curtis ha scritto:

…

I meant require, wondered why you mentioned it since we're using Rails' autoload and don't require it at all - possibly why it still works. --- Reply to this email directly or view it on GitHub: https://gist.github.com/2814849