Faster specs

Add to Gemfile into test and development groups:

gem 'perftools.rb', require: 'perftools'

From the command line:

$ time CPUPROFILE=~/tmp/prof CPUPROFILE_REALTIME=1 rspec
$ pprof.rb --text ~/tmp/prof | head -10

In spec_helper.rb add:

# Quick hack to see what our peak number of objects on the heap is
heap_live_num = 0
config.after(:each) do
  heap_live_num = [heap_live_num, GC.stat[:heap_live_num]].max
end

config.after(:suite) do
  puts "\n\nMAX HEAP OBJECT COUNT: #{heap_live_num}"
end

Based on the previous value adjust:

export RUBY_HEAP_MIN_SLOTS=1500000
export RUBY_HEAP_FREE_MIN=20000
export RUBY_GC_MALLOC_LIMIT=100000000

Note: you can put them into your .bashrc

Credits

• GC Settings Tweaks #1
• GC Settings Tweaks #2
• Guard with Spork
• RailsCasts on Spork