make_files.rb

`mkdir f`
10000.times do |x|
  `touch f/bogus#{x}.rb`
end

require_benchmark.rb

require 'rubygems'
$LOAD_PATH.unshift(File.expand_path('f'))

x = 0

require 'benchmark'

Benchmark.bm do |b|
  (1..5).each do |n|
    b.report("#{n * 500} requires") { (n*500).times { require "bogus#{x}"; x += 1 }}
  end
end

For those playing along at home, here is the latest progress update: http://redmine.ruby-lang.org/issues/show/3924
Turns out there's already a case-insensitive hash in MRI (st.h) which certainly made things easier.

(note this graph is versus 1.8.7 over a larger number of files)

I'm going to look into improving the LOADED_FEATURES array as well, probably by making it use a case-insensitive Set or Map for searches internally. I see now that's likely a primary bottleneck when lots of features are getting loaded, due to the O(N) search every time.

Well I wasn't able to open an issue on your ruby fork, but I ran your blog post scripts and got an error when trying to run rails s --debug (so using ruby-debug19)

Error:

/home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:236:in `require': /home/jenny/.rvm/gems/ruby-head-patched/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so: undefined symbol: ruby_thread_data_type - /home/jenny/.rvm/gems/ruby-head-patched/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so (LoadError)
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:236:in `block in require'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:222:in `block in load_dependency'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:616:in `new_constants_in'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:222:in `load_dependency'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:236:in `require'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `<top (required)>'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:236:in `require'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:236:in `block in require'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:222:in `block in load_dependency'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:616:in `new_constants_in'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:222:in `load_dependency'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/activesupport/lib/active_support/dependencies.rb:236:in `require'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `<top (required)>'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler/runtime.rb:68:in `require'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler/runtime.rb:66:in `each'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler/runtime.rb:66:in `block in require'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler/runtime.rb:55:in `each'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler/runtime.rb:55:in `require'
from /home/jenny/.rvm/gems/ruby-head-patched/gems/bundler-1.0.14/lib/bundler.rb:120:in `require'
from /home/jenny/Projects/GoldenCMS/config/application.rb:7:in `<top (required)>'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/railties/lib/rails/commands.rb:56:in `require'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/railties/lib/rails/commands.rb:56:in `block in <top (required)>'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/railties/lib/rails/commands.rb:53:in `tap'
from /home/jenny/.rvm/gems/ruby-head-patched/bundler/gems/rails-62d5ef0c17b4/railties/lib/rails/commands.rb:53:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'

(Same error occurs just running 'rails s')

At this point I wish I was more knowledgeable in ruby, but I'm afraid I don't have the time at the moment to dive into the issue. Maybe later today after I get some work done.

As a side note, this same rails project runs fine using:

• MRI 1.9.2
• rails3.1
• ruby-debug19
• ect...

Only differences in environment to trigger the code:

• MRI-1.9.2 <--> MRI-1.9.3
• Your patch

urgh that doesn't look friendly. Are you able to try on 1.9.3 without my patch?

Thanks for trying it out!

Ah yep... the same error occurred using straight 1.9.3dev.
Well in a strange sense I'm pumped your patch still looks good! Thanks for all the work your putting into this!

Cheers!