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How to use _least_loaded_drone method in autotest

Best Python code snippet using autotest_python

drone_manager.py

Source:drone_manager.py

...483        runnable_processes = [484                wrapper.drone.max_processes - wrapper.drone.active_processes485                for wrapper in usable_drone_wrappers]486        return max([0] + runnable_processes)487    def _least_loaded_drone(self, drones):488        return min(drones, key=lambda d: d.used_capacity())489    def pick_drone_to_use(self, num_processes=1, prefer_ssp=False):490        """Return a drone to use.491        Various options can be passed to optimize drone selection.492        num_processes is the number of processes the drone is intended493        to run.494        prefer_ssp indicates whether drones supporting server-side495        packaging should be preferred.  The returned drone is not496        guaranteed to support it.497        This public API is exposed for luciferlib to wrap.498        Returns a drone instance (see drones.py).499        """500        return self._choose_drone_for_execution(501                num_processes=num_processes,502                username=None,  # Always allow all drones503                drone_hostnames_allowed=None,  # Always allow all drones504                require_ssp=prefer_ssp,505        )506    def _choose_drone_for_execution(self, num_processes, username,507                                    drone_hostnames_allowed,508                                    require_ssp=False):509        """Choose a drone to execute command.510        @param num_processes: Number of processes needed for execution.511        @param username: Name of the user to execute the command.512        @param drone_hostnames_allowed: A list of names of drone allowed.513        @param require_ssp: Require server-side packaging to execute the,514                            command, default to False.515        @return: A drone object to be used for execution.516        """517        # cycle through drones is order of increasing used capacity until518        # we find one that can handle these processes519        checked_drones = []520        usable_drones = []521        # Drones do not support server-side packaging, used as backup if no522        # drone is found to run command requires server-side packaging.523        no_ssp_drones = []524        drone_to_use = None525        while self._drone_queue:526            drone = heapq.heappop(self._drone_queue).drone527            checked_drones.append(drone)528            logging.info('Checking drone %s', drone.hostname)529            if not drone.usable_by(username):530                continue531            drone_allowed = (drone_hostnames_allowed is None532                             or drone.hostname in drone_hostnames_allowed)533            if not drone_allowed:534                logging.debug('Drone %s not allowed: ', drone.hostname)535                continue536            if require_ssp and not drone.support_ssp:537                logging.debug('Drone %s does not support server-side '538                              'packaging.', drone.hostname)539                no_ssp_drones.append(drone)540                continue541            usable_drones.append(drone)542            if drone.active_processes + num_processes <= drone.max_processes:543                drone_to_use = drone544                break545            logging.info('Drone %s has %d active + %s requested > %s max',546                         drone.hostname, drone.active_processes, num_processes,547                         drone.max_processes)548        if not drone_to_use and usable_drones:549            # Drones are all over loaded, pick the one with least load.550            drone_summary = ','.join('%s %s/%s' % (drone.hostname,551                                                   drone.active_processes,552                                                   drone.max_processes)553                                     for drone in usable_drones)554            logging.error('No drone has capacity to handle %d processes (%s) '555                          'for user %s', num_processes, drone_summary, username)556            drone_to_use = self._least_loaded_drone(usable_drones)557        elif not drone_to_use and require_ssp and no_ssp_drones:558            # No drone supports server-side packaging, choose the least loaded.559            drone_to_use = self._least_loaded_drone(no_ssp_drones)560        # refill _drone_queue561        for drone in checked_drones:562            self._enqueue_drone(drone)563        return drone_to_use564    def _substitute_working_directory_into_command(self, command,565                                                   working_directory):566        for i, item in enumerate(command):567            if item is WORKING_DIRECTORY:568                command[i] = working_directory569    def execute_command(self, command, working_directory, pidfile_name,570                        num_processes, log_file=None, paired_with_pidfile=None,571                        username=None, drone_hostnames_allowed=None):572        """573        Execute the given command, taken as an argv list....

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