From: Rodrigo Rosenfeld Rosas <rr.rosas@...>
Date: 2011-05-28T22:16:22+09:00
Subject: [ruby-core:36527] Re: [Ruby 1.9 - Bug #3924] Performance bug (in require?)

Great work, Xavier!

I would like to try it but my RVM installation seems to be broken somehow:

rvm install ruby-head --patch /tmp/require-performance-fix.patch

Installing Ruby from source to: 
/home/rodrigo/.rvm/rubies/ruby-1.8.7-p334, this may take a while 
depending on your cpu(s)...

I don't know why it insists on 1.8.7, but I'll try it manually as soon 
as I have some time, thanks!

I'll let you know the feedbacks.

Regards,

Rodrigo.

Em 27-05-2011 22:11, Xavier Shay escreveu:
> Issue #3924 has been updated by Xavier Shay.
>
>
> My last problem was related to the build system pushing things into $" and bypassing require.
>
> I now have a patch that I woud like to submit for consideration:
> https://gist.github.com/996418
>
> I am going to try and get some more eyeballs on this to test it more thoroughly:
> http://rhnh.net/2011/05/28/speeding-up-rails-startup-time
> ----------------------------------------
> Bug #3924: Performance bug (in require?)
> http://redmine.ruby-lang.org/issues/3924
>
> Author: Carsten Bormann
> Status: Open
> Priority: Normal
> Assignee:
> Category: core
> Target version: 1.9.3
> ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10]
>
>
> =begin
>   Running irb<  /dev/null in 1.9.2 causes 3016 calls to lstat64.
>
>   For instance, there is a sequence of 28 repetitions each of lstat calls to all 6 non-empty path prefixes of /opt/local/lib/ruby1.9/1.9.1/irb.rb -- a total of 170 lstats apparently just to load this file; another set of lstats then occurs later for another 18 (times 6) times.  Clearly, something is running amok in the calling sequence rb_require_safe ->  realpath_rec ->  lstat.
>
>   Another example: Running a simple test with the baretest gem causes 17008 calls to lstat.  According to perftools.rb, 80 % of the 1.2 seconds of CPU is used in Kernel#gem_original_require (and another 12 in GC, some of which may be caused by this).
> =end
>
>
>