paperclipから呼び出すコマンドの負荷を少しでも下げたい ref: http://qiita.com/hotakasaito/items/8751c5fb05e7883af3f2

file0.txt

require 'paperclip/helpers'
Paperclip::Helpers.module_eval do
  def run(cmd, arguments = "", interpolation_values = {}, local_options = {})
    command_path = options[:command_path]
    Cocaine::CommandLine.path = [Cocaine::CommandLine.path, command_path].flatten.compact.uniq
    if logging? && (options[:log_command] || local_options[:log_command])
      local_options = local_options.merge(:logger => logger)
    end
    Cocaine::CommandLine.new("#{Rails.env.production? ? 'ionice -c3 -n7 ' : ''}nice -n19 #{cmd}", arguments, local_options).run(interpolation_values)
  end
end