Issue #10015 has been updated by Nobuyoshi Nakada.

Status changed from Closed to Feedback

Adrien Siami wrote:
> A slow page was running in 16 seconds with 2.2.1 where it was running in less than 3 seconds with 2.1.5
> it runs in 3.1289695860032225 secs with 2.2.1 and 2.403 secs with 2.1.5

What's your platform and filesystem?
As the former seems pretty bigger than the later, they may be caused by different reasons.

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Bug #10015: Performance regression in Dir#[]
https://bugs.ruby-lang.org/issues/10015#change-51958

* Author: Aaron Patterson
* Status: Feedback
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.0dev (2014-02-04 trunk 44802) [x86_64-darwin13.0]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
r44802 seems to have introduced a performance regression in Dir#[].

Here is the test program:

~~~ruby
require 'benchmark'

puts Benchmark.realtime {
  glob = "minitest/*_plugin.rb{,.rb,.bundle}"
  $LOAD_PATH.map { |load_path|
    Dir["#{File.expand_path glob, load_path}"]
  }.flatten.select { |file| File.file? file.untaint }
}
~~~

Here is the test time for me:

~~~
$ ruby -v test.rb
ruby 2.2.0dev (2014-02-04 trunk 44801) [x86_64-darwin13.0]
0.000341
$ ruby -v test.rb
ruby 2.2.0dev (2014-02-04 trunk 44802) [x86_64-darwin13.0]
0.009333
~~~

r44801 seems much faster than r44802.



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