float LinuxParser::MemoryUtilization() {
  std::string input_dir = kProcDirectory + kMeminfoFilename;

  std::map<std::string, std::regex> search_dict;
  search_dict["memtotal"] = "MemTotal:\\s*(\\d*)\\s\\D";
  search_dict["memfree"]  = "MemFree:\\s*(\\d*)\\s\\D";

  auto parsed_values = search_stream(input_dir, search_dict);
  float memtotal{1}, memfree{0};

  for (auto const& [key, val] : parsed_values){
    if(key == "memtotal") {memtotal = std::stof(val);}
    if(key == "memfree") {memfree = std::stof(val);}
  }
  return (memtotal - memfree)/memtotal;
}