# File lib/bundler/installer.rb, line 53
    def run(options)
      create_bundle_path

      if Bundler.settings[:frozen]
        @definition.ensure_equivalent_gemfile_and_lockfile(options[:deployment])
      end

      if dependencies.empty?
        Bundler.ui.warn "The Gemfile specifies no dependencies"
        lock
        return
      end

      if Bundler.default_lockfile.exist? && !options["update"]
        local = Bundler.ui.silence do
          begin
            tmpdef = Definition.build(Bundler.default_gemfile, Bundler.default_lockfile, nil)
            true unless tmpdef.new_platform? || tmpdef.missing_specs.any?
          rescue BundlerError
          end
        end
      end

      # Since we are installing, we can resolve the definition
      # using remote specs
      unless local
        options["local"] ? @definition.resolve_with_cache! : @definition.resolve_remotely!
      end

      force = options["force"]

      # the order that the resolver provides is significant, since
      # dependencies might actually affect the installation of a gem.
      # that said, it's a rare situation (other than rake), and parallel
      # installation is just SO MUCH FASTER. so we let people opt in.
      jobs = [Bundler.settings[:jobs].to_i-1, 1].max
      if jobs > 1 && can_install_in_parallel?
        require 'bundler/installer/parallel_installer'
        install_in_parallel jobs, options[:standalone], force
      else
        install_sequentially options[:standalone], force
      end

      lock unless Bundler.settings[:frozen]
      generate_standalone(options[:standalone]) if options[:standalone]
    end