code: def start(self, argv):
          
          parser = self.create_argument_parser()
          self.config = parser.parse_args(argv[1:])
  
          for arg in self.config.files:
              if not os.path.exists(arg) or not os.path.isfile(arg):
                  parser.error("File {0} does not exist.".format(repr(arg)))
  
          if os.path.isdir(self.config.output_path):
              self.config.output_path = os.path.normpath(self.config.output_path) + os.sep
  
          self.setup_logging()
  
          self.executor = self.load_executor()
  
          returnCode = 0
          for arg in self.config.files:
              if self.stopped_by_interrupt:
                  break
              logging.debug("Benchmark %r is started.", arg)
              rc = self.execute_benchmark(arg)
              returnCode = returnCode or rc
              logging.debug("Benchmark %r is done.", arg)
  
          logging.debug("I think my job is done. Have a nice day!")
          return returnCode
docs: Start BenchExec.
          @param argv: command-line options for BenchExec