deploy.rb

...

# Restart Passenger
deploy.task :restart, :roles => :app do
  ...
  
  # Restart the resque workers
  run "cd #{current_path} && rake queue:restart_workers RAILS_ENV=production"
end

resque.rake

namespace :queue do
  task :restart_workers => :environment do
    Resque.workers.each do |worker|
      system "kill -QUIT #{worker.pid}"
    end
    system("rm /var/run/god/resque-1.8.0*.pid")
  end
end