turn_the_gc_off.rb

# In your unicorn.rb
#
after_fork do |server, worker|
  GC.disable
end

# The rack app.
#
Responder = lambda do |env|
  harakiri
  # Your app here
end

# In the same scope as the Responder:
#
@@requests = 0
@@quit_after_requests = 50
def harakiri
  @@requests = @@requests + 1
  # Kill yourself off, by means of a quick slice.
  # Will finish the request in Unicorn with honor, then die.
  # Unicorn will fork you a new one.
  Process.kill(:QUIT, Process.pid) if @@requests > @@quit_after_requests
end