问题与解决方案：rails中的gem也会影响到内存占用(more gems consume more memories in rails app)

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在一个rails 应用中，都会遇到优化的问题。 （ 跟java不太一样。呵呵）   ( every Rails app will meet the performance optimization problems when or before it is being delivered.  -- which is not the same with JAVA, as far as I know,  it is much less things to do for java app. ) 

而我最近遇到了一个问题，就是发现，不同的rails app占用的内存不一样。似乎这个问题主要由rubygems引起的。(recently I met a problem that different rails applications consume different memories, and it seems that the root cause of this problem is the rubygems )

项目A：引用了 38个gem, 运行起来占用 100MB 内存。 (app A: required 38 gems, and cost me 100 MB memories) 

项目B： 引用了 10个 gem, 运行起来占用 30 MB 内存。（app B: required 10 gems and cost me 30 MB memories when running)

所以，优化gems的几个方法： ( so this is the solutions: )

1. 使用 groups. 这样在发布的时候，就可以忽略devlopment, test 这些group中定义的gem .  例如：  ( define groups for different gems by purpose. e.g.  'production' environment will ignore those gems in 'development' groups)

# gems used only for test/dev purpose
group :test, :development do
  gem "rspec-rails", ">= 2.5.0"
  gem 'factory_girl', '2.6.4'
  gem 'factory_girl_rails'
end

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
end

2. 使用 require => false 来声明gem, 但是等到需要的时候才require . 例如：  ( use :require => false to install the gems but not 'require' them automatically )

gem 'whenever', :require => false

参考资料：http://stackoverflow.com/questions/4800721/bundler-what-is-the-require-false-on-the-gemfile-means

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