Can someone advise me on Rails memory consumption?

I'm working on a Rails application at the moment which seems to kill
the memory on my iMac until I eventually have to restart.
I have a 2.66 GHZ processor with 4GB Ram on OSX 10.6.

When I boot the rails app, the memory consumption shows the following
(ps aux | grep rails):

Gavin 726 0.0 3.8 2590812 158860 s000 S+ 9:27am
0:09.90 /Users/Gavin/.rvm/rubies/ree-1.8.7-2011.01/bin/ruby script/
rails s

The RSS is at a cool 158,860 kb

After a few requests to localhost, this number jumps up to:

Gavin 726 0.0 14.1 3031792 592888 s000 S+ 9:27am
0:27.00 /Users/Gavin/.rvm/rubies/ree-1.8.7-2011.01/bin/ruby script/
rails s

592,888 kb

and with general development use, it goes up again and again and

Gavin 726 1.5 25.0 3487516 1050180 s000 S+ 9:27am
0:59.29 /Users/Gavin/.rvm/rubies/ree-1.8.7-2011.01/bin/ruby script/
rails s

I'm running REE using RVM

ruby 1.8.7 (2010-12-23 patchlevel 330) [i686-darwin10.6.0], MBARI
0x6770, Ruby Enterprise Edition 2011.01

The app is using Rails 3.0.6

The application is not particularly SQL intensive and there are almost
no associations included when records are loaded (not required in the

Am I right in saying this is a memory leak or is there something else
I should be looking at?

Can anybody offer some advice on how I can solve this?


Here's a full list of the gems used just incase there are any known
suspects in there:
source ''

gem "omniauth", "0.2.0"
gem "fb_graph"
gem 'rails', '>=3.0.6'
gem 'mysql2'
gem "delayed_job"
gem "rvm"
gem "whenever"
gem "less"
gem "bcrypt-ruby", :require => "bcrypt"
gem "twitter"
gem "paperclip"
gem "aws-s3"
gem "RedCloth"
gem "decent_exposure", :git => "git://

# Application monitoring services
gem 'hoptoad_notifier', ">=2.4.5"
gem "newrelic_rpm", ">=2.13.4"
gem "yahoo-weather", "1.2.0", :require => false
gem "json", "~>1.4.6"
gem 'will_paginate', :git => "git://
will_paginate.git", :branch => "rails3"
gem 'acts-as-taggable-on'
gem "aasm", ">=2.2.0", :require => "aasm"
gem 'thinking-sphinx', '2.0.2', :require => 'thinking_sphinx'

# These gems are not required on the Staging/Production server
group :development, :test do
  gem 'capistrano'
  gem "capistrano-ext"
  gem "nifty-generators"
  gem 'factory_girl_rails', :git => "

  # Keep on top of the latest RSpec Gems
  gem "rspec-rails", :git => "git://
  gem "rspec", :git => "git://"
  gem "rspec-core", :git => "git://
  gem "rspec-expectations", :git => "git://
  gem "rspec-mocks", :git => "git://
  gem 'shoulda'
  gem "mocha"

  # gives us the mock_model method for mocha
  gem 'rspec-rails-mocha', '~> 0.3.0'
  gem "faker"
  gem "autotest", ">=4.4.6"
  gem "autotest-growl"
  gem "autotest-rails"
  gem "database_cleaner"
  gem "redgreen"
  gem "launchy"
  gem "faker"
  gem 'ruby-debug'
  gem "rcov"
  gem "rdoc"
  gem "ruby-prof"

I don’t think the issue is Rails but REE. Have you run the same Rails app using regular Ruby and checked the memory usage?


Still having the same issue running the application on good ole system

Assuming there is a memory leak here, can anybody advise me on how I
can find the leak?

Otherwise, any other ideas?

Im having the same problem. Our Gemfile is very similar to yours. It
started happening when we upgraded from 3.0.5 -> 3.0.6 and even in 3.0.7
as well. After rolling back to 3.0.5 the memory consumption for our
dev environment went way down.

Someone should post this on rails lighthouse...