From: Yura Sokolov <funny.falcon@...>
Date: 2011-11-01T06:54:36+09:00
Subject: [ruby-core:40581] [ruby-trunk - Feature #5427] Not complex patch to improve `require` time (load.c)


Issue #5427 has been updated by Yura Sokolov.


I have a report from one man about it's application startup time with and without patch:

$ time ./bin/rails runner 'puts'

1.9.3-p0 without patch:
real 0m22.683s
user 0m21.417s
sys 0m0.956s

with patch:
real 0m17.806s
user 0m16.633s
sys 0m0.892s
----------------------------------------
Feature #5427: Not complex patch to improve `require` time (load.c)
http://redmine.ruby-lang.org/issues/5427

Author: Yura Sokolov
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


Currently `loaded_features` are unsorted, so that `rb_feature_p` ought to iterate over all `loaded_features` to figure: is requested feature loaded?

After this patch `loaded_features` is kept sorted by basename without extension (/usr/lib/ruby/asdf.rb => asdf). When `rb_feature_p` start its check, it goes straight to the first item with matching basename (using binary search) and stops after last.

Methods `$LOADED_FEATURES.<<` and `$LOADED_FEATURES.push` are overriden to keep sort order. `push` accepts only 1 parameter, but it seems that no one pass more to it.

Currently I choose to consider characters of basename in right to left order, but it could be changed, I think.

https://gist.github.com/1272991
https://github.com/ruby/ruby/pull/51


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