From: Benoit Daloze <redmine@...>
Date: 2011-10-12T03:51:34+09:00
Subject: [ruby-core:40109] [Ruby 1.9 - Feature #5427] Not complex patch to improve `require` time (load.c)


Issue #5427 has been updated by Benoit Daloze.


On 11 October 2011 04:42, Urabe Shyouhei wrote:
> On 10/10/2011 07:51 PM, Yura Sokolov wrote:
>> Anyway, is idea looks good?
>
> The approach is interesting.  Do you have any benchmarks for how fast is it?

I was also curious how it performed so I made a benchmark.

Please have a look at https://gist.github.com/1278881
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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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