# File lib/get_process_mem.rb, line 85
  def linux_memory(file = @process_file)
    lines = file.each_line.select {|line| line.match(/^Rss/) }
    return if lines.empty?
    lines.reduce(0) do |sum, line|
      line.match(/(?<value>(\d*\.{0,1}\d+))\s+(?<unit>\w\w)/) do |m|
        value = number_to_bigdecimal(m[:value]) + ROUND_UP
        unit  = m[:unit].downcase
        sum  += CONVERSION[unit] * value
      end
      sum
    end
  rescue Errno::EACCES
    0
  end