X-Git-Url: https://wannabe.guru.org/gitweb/?a=blobdiff_plain;f=executors.py;h=47b4a89a88d693d535ed2e036c6288829505a005;hb=f2b4fe83f6fc853a68653bd5e3d9fe0648c3d105;hp=453139a5fbd514525a8152a81cb2bd0673e9acc0;hpb=e6f32fdd9b373dfcd100c7accb41f57d83c2f0a1;p=python_utils.git diff --git a/executors.py b/executors.py index 453139a..47b4a89 100644 --- a/executors.py +++ b/executors.py @@ -74,10 +74,10 @@ def make_cloud_pickle(fun, *args, **kwargs): class BaseExecutor(ABC): def __init__(self, *, title=''): self.title = title - self.task_count = 0 self.histogram = hist.SimpleHistogram( hist.SimpleHistogram.n_evenly_spaced_buckets(int(0), int(500), 50) ) + self.task_count = 0 @abstractmethod def submit(self, function: Callable, *args, **kwargs) -> fut.Future: @@ -87,9 +87,34 @@ class BaseExecutor(ABC): def shutdown(self, wait: bool = True) -> None: pass + def shutdown_if_idle(self) -> bool: + """Shutdown the executor and return True if the executor is idle + (i.e. there are no pending or active tasks). Return False + otherwise. Note: this should only be called by the launcher + process. + + """ + if self.task_count == 0: + self.shutdown() + return True + return False + def adjust_task_count(self, delta: int) -> None: + """Change the task count. Note: do not call this method from a + worker, it should only be called by the launcher process / + thread / machine. + + """ self.task_count += delta - logger.debug(f'Executor current task count is {self.task_count}') + logger.debug(f'Adjusted task count by {delta} to {self.task_count}') + + def get_task_count(self) -> int: + """Change the task count. Note: do not call this method from a + worker, it should only be called by the launcher process / + thread / machine. + + """ + return self.task_count class ThreadExecutor(BaseExecutor): @@ -104,34 +129,38 @@ class ThreadExecutor(BaseExecutor): self._thread_pool_executor = fut.ThreadPoolExecutor( max_workers=workers, thread_name_prefix="thread_executor_helper" ) + self.already_shutdown = False + # This is run on a different thread; do not adjust task count here. def run_local_bundle(self, fun, *args, **kwargs): logger.debug(f"Running local bundle at {fun.__name__}") - start = time.time() result = fun(*args, **kwargs) - end = time.time() - self.adjust_task_count(-1) - duration = end - start - logger.debug(f"{fun.__name__} finished; used {duration:.1f}s") - self.histogram.add_item(duration) return result @overrides def submit(self, function: Callable, *args, **kwargs) -> fut.Future: + if self.already_shutdown: + raise Exception('Submitted work after shutdown.') self.adjust_task_count(+1) newargs = [] newargs.append(function) for arg in args: newargs.append(arg) - return self._thread_pool_executor.submit( + start = time.time() + result = self._thread_pool_executor.submit( self.run_local_bundle, *newargs, **kwargs ) + result.add_done_callback(lambda _: self.histogram.add_item(time.time() - start)) + result.add_done_callback(lambda _: self.adjust_task_count(-1)) + return result @overrides def shutdown(self, wait=True) -> None: - logger.debug(f'Shutting down threadpool executor {self.title}') - print(self.histogram) - self._thread_pool_executor.shutdown(wait) + if not self.already_shutdown: + logger.debug(f'Shutting down threadpool executor {self.title}') + print(self.histogram) + self._thread_pool_executor.shutdown(wait) + self.already_shutdown = True class ProcessExecutor(BaseExecutor): @@ -146,28 +175,34 @@ class ProcessExecutor(BaseExecutor): self._process_executor = fut.ProcessPoolExecutor( max_workers=workers, ) + self.already_shutdown = False + # This is run in another process; do not adjust task count here. def run_cloud_pickle(self, pickle): fun, args, kwargs = cloudpickle.loads(pickle) logger.debug(f"Running pickled bundle at {fun.__name__}") result = fun(*args, **kwargs) - self.adjust_task_count(-1) return result @overrides def submit(self, function: Callable, *args, **kwargs) -> fut.Future: + if self.already_shutdown: + raise Exception('Submitted work after shutdown.') start = time.time() self.adjust_task_count(+1) pickle = make_cloud_pickle(function, *args, **kwargs) result = self._process_executor.submit(self.run_cloud_pickle, pickle) result.add_done_callback(lambda _: self.histogram.add_item(time.time() - start)) + result.add_done_callback(lambda _: self.adjust_task_count(-1)) return result @overrides def shutdown(self, wait=True) -> None: - logger.debug(f'Shutting down processpool executor {self.title}') - self._process_executor.shutdown(wait) - print(self.histogram) + if not self.already_shutdown: + logger.debug(f'Shutting down processpool executor {self.title}') + self._process_executor.shutdown(wait) + print(self.histogram) + self.already_shutdown = True def __getstate__(self): state = self.__dict__.copy() @@ -428,21 +463,29 @@ class WeightedRandomRemoteWorkerSelectionPolicy(RemoteWorkerSelectionPolicy): def acquire_worker(self, machine_to_avoid=None) -> Optional[RemoteWorkerRecord]: grabbag = [] for worker in self.workers: - for x in range(0, worker.count): - for y in range(0, worker.weight): - grabbag.append(worker) - - for _ in range(0, 5): - random.shuffle(grabbag) - worker = grabbag[0] - if worker.machine != machine_to_avoid or _ > 2: + if worker.machine != machine_to_avoid: + if worker.count > 0: + for _ in range(worker.count * worker.weight): + grabbag.append(worker) + + if len(grabbag) == 0: + logger.debug( + f'There are no available workers that avoid {machine_to_avoid}...' + ) + for worker in self.workers: if worker.count > 0: - worker.count -= 1 - logger.debug(f'Selected worker {worker}') - return worker - msg = 'Unexpectedly could not find a worker, retrying...' - logger.warning(msg) - return None + for _ in range(worker.count * worker.weight): + grabbag.append(worker) + + if len(grabbag) == 0: + logger.warning('There are no available workers?!') + return None + + worker = random.sample(grabbag, 1)[0] + assert worker.count > 0 + worker.count -= 1 + logger.debug(f'Chose worker {worker}') + return worker class RoundRobinRemoteWorkerSelectionPolicy(RemoteWorkerSelectionPolicy): @@ -513,9 +556,10 @@ class RemoteExecutor(BaseExecutor): self.heartbeat_thread, self.heartbeat_stop_event, ) = self.run_periodic_heartbeat() + self.already_shutdown = False @background_thread - def run_periodic_heartbeat(self, stop_event) -> None: + def run_periodic_heartbeat(self, stop_event: threading.Event) -> None: while not stop_event.is_set(): time.sleep(5.0) logger.debug('Running periodic heartbeat code...') @@ -523,8 +567,10 @@ class RemoteExecutor(BaseExecutor): logger.debug('Periodic heartbeat thread shutting down.') def heartbeat(self) -> None: + # Note: this is invoked on a background thread, not an + # executor thread. Be careful what you do with it b/c it + # needs to get back and dump status again periodically. with self.status.lock: - # Dump regular progress report self.status.periodic_dump(self.total_bundles_submitted) # Look for bundles to reschedule via executor.submit @@ -539,7 +585,7 @@ class RemoteExecutor(BaseExecutor): if ( num_done > 2 and num_idle_workers > 1 - and (self.last_backup is None or (now - self.last_backup > 6.0)) + and (self.last_backup is None or (now - self.last_backup > 9.0)) and self.backup_lock.acquire(blocking=False) ): try: @@ -1053,6 +1099,8 @@ class RemoteExecutor(BaseExecutor): @overrides def submit(self, function: Callable, *args, **kwargs) -> fut.Future: + if self.already_shutdown: + raise Exception('Submitted work after shutdown.') pickle = make_cloud_pickle(function, *args, **kwargs) bundle = self.create_original_bundle(pickle, function.__name__) self.total_bundles_submitted += 1 @@ -1060,11 +1108,13 @@ class RemoteExecutor(BaseExecutor): @overrides def shutdown(self, wait=True) -> None: - logging.debug(f'Shutting down RemoteExecutor {self.title}') - self.heartbeat_stop_event.set() - self.heartbeat_thread.join() - self._helper_executor.shutdown(wait) - print(self.histogram) + if not self.already_shutdown: + logging.debug(f'Shutting down RemoteExecutor {self.title}') + self.heartbeat_stop_event.set() + self.heartbeat_thread.join() + self._helper_executor.shutdown(wait) + print(self.histogram) + self.already_shutdown = True @singleton @@ -1104,7 +1154,7 @@ class DefaultExecutors(object): RemoteWorkerRecord( username='scott', machine='cheetah.house', - weight=34, + weight=30, count=6, ), ) @@ -1134,7 +1184,7 @@ class DefaultExecutors(object): RemoteWorkerRecord( username='scott', machine='puma.cabin', - weight=25, + weight=30, count=6, ), ) @@ -1144,7 +1194,7 @@ class DefaultExecutors(object): RemoteWorkerRecord( username='scott', machine='backup.house', - weight=7, + weight=8, count=2, ), )