code: def execute_benchmark(self, benchmark_file):
          
          benchmark = Benchmark(benchmark_file, self.config,
                                self.config.start_time or time.localtime())
          self.check_existing_results(benchmark)
  
          self.executor.init(self.config, benchmark)
          output_handler = OutputHandler(benchmark, self.executor.get_system_info(),
                                         self.config.compress_results)
  
          logging.debug("I'm benchmarking %r consisting of %s run sets.",
                        benchmark_file, len(benchmark.run_sets))
  
          try:
              result = self.executor.execute_benchmark(benchmark, output_handler)
          finally:
              output_handler.close()
              # remove useless log folder if it is empty
              try:
                  os.rmdir(benchmark.log_folder)
              except:
                  pass
  
          if self.config.commit and not self.stopped_by_interrupt:
              try:
                  util.add_files_to_git_repository(self.config.output_path,
                          output_handler.all_created_files,
                          self.config.commit_message + '\n\n'
                              + output_handler.description + '\n\n'
                              + str(output_handler.statistics))
              except OSError as e:
                  logging.warning('Could not add files to git repository: %s', e)
          return result
docs: Execute a single benchmark as defined in a file.
          If called directly, ensure that config and executor attributes are set up.
          @param benchmark_file: the name of a benchmark-definition XML file
          @return: a result value from the executor module