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284 lines
11 KiB
284 lines
11 KiB
#!/usr/bin/env python3
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# Copyright (c) Facebook, Inc. and its affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the BSD-style license found in the
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# LICENSE file in the root directory of this source tree.
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import sys
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import uuid
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from dataclasses import dataclass, field
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from typing import Any, Callable, Dict, List, Optional, Tuple, Union
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import torch.distributed.elastic.rendezvous.registry as rdzv_registry
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from torch.distributed.elastic import events, metrics
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from torch.distributed.elastic.agent.server.api import WorkerSpec
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from torch.distributed.elastic.agent.server.local_elastic_agent import LocalElasticAgent
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from torch.distributed.elastic.multiprocessing import DefaultLogsSpecs, LogsSpecs, SignalException
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from torch.distributed.elastic.multiprocessing.errors import ChildFailedError
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from torch.distributed.elastic.rendezvous import RendezvousParameters
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from torch.distributed.elastic.rendezvous.utils import parse_rendezvous_endpoint
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from torch.distributed.elastic.utils.logging import get_logger
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__all__ = ['LaunchConfig', 'elastic_launch', 'launch_agent']
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logger = get_logger(__name__)
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@dataclass
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class LaunchConfig:
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"""
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Creates a rendezvous config.
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Args:
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min_nodes: Minimum amount of nodes that the user function will
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be launched on. Elastic agent ensures that the user
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function start only when the min_nodes amount enters
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the rendezvous.
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max_nodes: Maximum amount of nodes that the user function
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will be launched on.
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nproc_per_node: On each node the elastic agent will launch
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this amount of workers that will execute user
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defined function.
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rdzv_backend: rdzv_backend to use in the rendezvous (zeus-adapter, etcd).
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rdzv_endpoint: The endpoint of the rdzv sync. storage.
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rdzv_configs: Key, value pair that specifies rendezvous specific configuration.
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rdzv_timeout: Legacy argument that specifies timeout for the rendezvous. It is going
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to be removed in future versions, see the note below. The default timeout is 900 seconds.
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run_id: The unique run id of the job (if not passed a unique one will be
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deduced from run environment - flow workflow id in flow - or auto generated).
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role: User defined role of the worker (defaults to "trainer").
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max_restarts: The maximum amount of restarts that elastic agent will conduct
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on workers before failure.
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monitor_interval: The interval in seconds that is used by the elastic_agent
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as a period of monitoring workers.
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start_method: The method is used by the elastic agent to start the
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workers (spawn, fork, forkserver).
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metrics_cfg: configuration to initialize metrics.
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local_addr: address of the local node if any. If not set, a lookup on the local
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machine's FQDN will be performed.
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local_ranks_filter: ranks for which to show logs in console. If not set, show from all.
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..note:
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`rdzv_timeout` is a legacy argument that will be removed in future.
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Set the timeout via `rdzv_configs['timeout']`
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"""
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min_nodes: int
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max_nodes: int
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nproc_per_node: int
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logs_specs: Optional[LogsSpecs] = None
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run_id: str = ""
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role: str = "default_role"
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rdzv_endpoint: str = ""
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rdzv_backend: str = "etcd"
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rdzv_configs: Dict[str, Any] = field(default_factory=dict)
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rdzv_timeout: int = -1
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max_restarts: int = 3
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monitor_interval: float = 30
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start_method: str = "spawn"
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log_line_prefix_template: Optional[str] = None
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metrics_cfg: Dict[str, str] = field(default_factory=dict)
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local_addr: Optional[str] = None
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def __post_init__(self):
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default_timeout = 900
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if self.rdzv_timeout != -1:
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self.rdzv_configs["timeout"] = self.rdzv_timeout
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elif "timeout" not in self.rdzv_configs:
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self.rdzv_configs["timeout"] = default_timeout
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# Post-processing to enable refactoring to introduce logs_specs due to non-torchrun API usage
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if self.logs_specs is None:
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self.logs_specs = DefaultLogsSpecs()
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class elastic_launch:
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"""
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Launches an torchelastic agent on the container that invoked the entrypoint.
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1. Pass the ``entrypoint`` arguments as non ``kwargs`` (e.g. no named parameters)/
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``entrypoint`` can be a function or a command.
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2. The return value is a map of each worker's output mapped
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by their respective global rank.
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Usage
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::
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def worker_fn(foo):
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# ...
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def main():
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# entrypoint is a function.
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outputs = elastic_launch(LaunchConfig, worker_fn)(foo)
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# return rank 0's output
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return outputs[0]
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# entrypoint is a command and ``script.py`` is the python module.
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outputs = elastic_launch(LaunchConfig, "script.py")(args)
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outputs = elastic_launch(LaunchConfig, "python")("script.py")
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"""
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def __init__(
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self,
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config: LaunchConfig,
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entrypoint: Union[Callable, str, None],
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):
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self._config = config
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self._entrypoint = entrypoint
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def __call__(self, *args):
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return launch_agent(self._config, self._entrypoint, list(args))
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def _get_entrypoint_name(
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entrypoint: Union[Callable, str, None], args: List[Any]
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) -> str:
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"""Retrieve entrypoint name with the rule:
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1. If entrypoint is a function, use ``entrypoint.__qualname__``.
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2. If entrypoint is a string, check its value:
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2.1 if entrypoint equals to ``sys.executable`` (like "python"), use the first element from ``args``
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which does not start with hifen letter (for example, "-u" will be skipped).
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2.2 otherwise, use ``entrypoint`` value.
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3. Otherwise, return empty string.
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"""
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if isinstance(entrypoint, Callable): # type: ignore[arg-type]
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return entrypoint.__name__ # type: ignore[union-attr]
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elif isinstance(entrypoint, str):
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if entrypoint == sys.executable:
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return next((arg for arg in args if arg[0] != "-"), "")
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else:
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return entrypoint
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else:
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return ""
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def _get_addr_and_port(
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rdzv_parameters: RendezvousParameters,
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) -> Tuple[Optional[str], Optional[int]]:
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if rdzv_parameters.backend != "static":
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return (None, None)
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endpoint = rdzv_parameters.endpoint
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endpoint = endpoint.strip()
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if not endpoint:
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raise ValueError(
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"Endpoint is missing in endpoint. Try to add --master-addr and --master-port"
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)
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master_addr, master_port = parse_rendezvous_endpoint(endpoint, default_port=-1)
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if master_port == -1:
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raise ValueError(
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f"port is missing in endpoint: {endpoint}. Try to specify --master-port"
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)
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return (master_addr, master_port)
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def launch_agent(
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config: LaunchConfig,
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entrypoint: Union[Callable, str, None],
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args: List[Any],
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) -> Dict[int, Any]:
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if not config.run_id:
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run_id = str(uuid.uuid4().int)
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logger.warning("config has no run_id, generated a random run_id: %s", run_id)
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config.run_id = run_id
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entrypoint_name = _get_entrypoint_name(entrypoint, args)
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logger.info(
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"Starting elastic_operator with launch configs:\n"
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" entrypoint : %(entrypoint)s\n"
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" min_nodes : %(min_nodes)s\n"
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" max_nodes : %(max_nodes)s\n"
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" nproc_per_node : %(nproc_per_node)s\n"
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" run_id : %(run_id)s\n"
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" rdzv_backend : %(rdzv_backend)s\n"
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" rdzv_endpoint : %(rdzv_endpoint)s\n"
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" rdzv_configs : %(rdzv_configs)s\n"
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" max_restarts : %(max_restarts)s\n"
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" monitor_interval : %(monitor_interval)s\n"
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" log_dir : %(log_dir)s\n"
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" metrics_cfg : %(metrics_cfg)s\n",
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{
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"entrypoint": entrypoint_name,
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"min_nodes": config.min_nodes,
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"max_nodes": config.max_nodes,
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"nproc_per_node": config.nproc_per_node,
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"run_id": config.run_id,
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"rdzv_backend": config.rdzv_backend,
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"rdzv_endpoint": config.rdzv_endpoint,
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"rdzv_configs": config.rdzv_configs,
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"max_restarts": config.max_restarts,
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"monitor_interval": config.monitor_interval,
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"log_dir": config.logs_specs.root_log_dir, # type: ignore[union-attr]
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"metrics_cfg": config.metrics_cfg
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}
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)
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rdzv_parameters = RendezvousParameters(
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backend=config.rdzv_backend,
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endpoint=config.rdzv_endpoint,
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run_id=config.run_id,
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min_nodes=config.min_nodes,
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max_nodes=config.max_nodes,
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local_addr=config.local_addr,
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**config.rdzv_configs,
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)
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master_addr, master_port = _get_addr_and_port(rdzv_parameters)
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spec = WorkerSpec(
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role=config.role,
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local_world_size=config.nproc_per_node,
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entrypoint=entrypoint,
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args=tuple(args),
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rdzv_handler=rdzv_registry.get_rendezvous_handler(rdzv_parameters),
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max_restarts=config.max_restarts,
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monitor_interval=config.monitor_interval,
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master_addr=master_addr,
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master_port=master_port,
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local_addr=config.local_addr,
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)
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agent = LocalElasticAgent(
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spec=spec,
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logs_specs=config.logs_specs, # type: ignore[arg-type]
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start_method=config.start_method,
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log_line_prefix_template=config.log_line_prefix_template,
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)
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shutdown_rdzv = True
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try:
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metrics.initialize_metrics(metrics.MetricsConfig(config.metrics_cfg))
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result = agent.run()
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# records that agent.run() has succeeded NOT that workers have succeeded
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events.record(agent.get_event_succeeded())
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if result.is_failed():
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# ChildFailedError is treated specially by @record
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# if the error files for the failed children exist
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# @record will copy the first error (root cause)
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# to the error file of the launcher process.
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raise ChildFailedError(
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name=entrypoint_name,
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failures=result.failures,
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)
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return result.return_values
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except ChildFailedError:
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raise
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except SignalException:
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# when the agent dies with a signal do NOT shutdown the rdzv_handler
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# since this closes the rendezvous on this rdzv_id permanently and
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# prevents any additional scaling events
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shutdown_rdzv = False
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events.record(agent.get_event_failed())
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raise
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except Exception:
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events.record(agent.get_event_failed())
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raise
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finally:
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if shutdown_rdzv:
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spec.rdzv_handler.shutdown()
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