If you haven't done it yet, you should consider switching from Spork to Zeus.
Vanilla Dev Env
These are execution times for
console commands on my machine before applying any performance tweaks.
time rails c rails c 12.03s user 2.56s system 16% cpu 1:09.97 total
time rails s rails s 11.49s user 2.28s system 35% cpu 39.126 total
Let's try to improve it.
Step 1: Patched Ruby 1.9.3-p194
The following patch for Ruby 1.9.3-p194 by burke incorporates new version of garbage collector that will come with the release of Ruby 2.0. The installation is pretty straightforward, both for rbenv and rvm.
curl https://raw.github.com/gist/1688857/rbenv.sh | sh ; rbenv global 1.9.3-p194-perf
rvm get head && rvm reinstall 1.9.3-perf --patch falcon --force-autoconf -j 3
As it's a new version of Ruby, we have to install all gems once again.
gem install bundler bundle install
Let's check how it improves Rails boot up
time rails c rails c 4.76s user 1.77s system 78% cpu 8.324 total
time rails s rails s 4.53s user 1.66s system 74% cpu 8.327 total
Pretty cool. In my case even much faster than declared in the gist 30% time improvement.
Step 2: Zeus
Zeus preloads your Rails environment. It is easier to use that Spork as you don't have to put it as a dependency in
Gemfile or to modify any files (e.g.
spec_helper). It not only greatly increases tests execution time, but also handles usual development commands (
console, etc.) The tool was designed to work with new version of garbage collector mentioned above. Check author's screencast to see Zeus in action.
Zeus requires OS X 10.7+ or Linux 2.6.13+ and works with Rails 3.0+ (at the time of writing).
In your project directory:
gem install zeus zeus init zeus start
Let's check how Zeus helps with Rails boot up time
time zeus s zeus s 0.20s user 0.07s system 22% cpu 1.181 total
time zeus c zeus c 0.20s user 0.07s system 16% cpu 1.715 total
Overall, in my case, Rails
server starts approx. 59x faster and Rails
console approx. 22x faster than vanilla Ruby/Rails installation. That's quite a change!