meminfo_output.each_line do |line|
      mem['total']     = line.split(/\s+/)[1].to_i * 1024 if line =~ /^MemTotal/
      mem['free']      = line.split(/\s+/)[1].to_i * 1024 if line =~ /^MemFree/
      mem['buffers']   = line.split(/\s+/)[1].to_i * 1024 if line =~ /^Buffers/
      mem['cached']    = line.split(/\s+/)[1].to_i * 1024 if line =~ /^Cached/