From: Ryan Davis <ryand-ruby@...>
Date: 2010-12-07T21:05:42+09:00
Subject: [ruby-core:33620] Re: Initialization time


On Dec 5, 2010, at 12:29 , SASADA Koichi wrote:

> (2010/12/06 4:32), Luis Lavena wrote:
>> I don't think the huge initialization time is YARV fault, but really a
>> slower IO functionality of 1.9.2
>> 
>> Rails combined with any BDD tool like RSpec and Cucumber that needs to load
>> the whole Rails environment on every run can be slow.
>> 
>> Even more with every require several stat operations are performed over the
>> $LOAD_PATH.
> 
> Do you know the application I can access?

Quick and dirty profiling could be had via:

gem install rails
rails profiling
cd profiling
ruby19 ./script/runner -e 0

(-e 0 may need to be changed to an empty script instead)

This may have to be changed to be compatible with rails 3 if you go with that version... But it should be painful enough in both rails 2 or 3. Last time I profiled it, rails 2 (low ... 2.1 or 2.2 or so) had > 500 requires just for startup.