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Source code for pytorch_lightning.plugins.environments.slurm_environment

# Copyright The PyTorch Lightning team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import logging
import os
import re

from pytorch_lightning.plugins.environments.cluster_environment import ClusterEnvironment

log = logging.getLogger(__name__)


[docs]class SLURMEnvironment(ClusterEnvironment): """Cluster environment for training on a cluster managed by SLURM."""
[docs] def creates_children(self) -> bool: return True
[docs] def master_address(self) -> str: # figure out the root node addr slurm_nodelist = os.environ.get("SLURM_NODELIST") if slurm_nodelist: root_node = slurm_nodelist.split(" ")[0].split(",")[0] else: root_node = "127.0.0.1" root_node = self.resolve_root_node_address(root_node) os.environ["MASTER_ADDR"] = root_node log.debug(f"MASTER_ADDR: {os.environ['MASTER_ADDR']}") return root_node
[docs] def master_port(self) -> int: # ----------------------- # SLURM JOB = PORT number # ----------------------- # this way every process knows what port to use default_port = os.environ.get("SLURM_JOB_ID") if default_port: # use the last 4 numbers in the job id as the id default_port = default_port[-4:] # all ports should be in the 10k+ range default_port = int(default_port) + 15000 else: default_port = 12910 # ----------------------- # PORT NUMBER = MASTER_PORT # ----------------------- # in case the user passed it in if "MASTER_PORT" in os.environ: default_port = os.environ["MASTER_PORT"] else: os.environ["MASTER_PORT"] = str(default_port) log.debug(f"MASTER_PORT: {os.environ['MASTER_PORT']}") return int(default_port)
[docs] def world_size(self) -> int: return int(os.environ["SLURM_NTASKS"])
def set_world_size(self, size: int) -> None: log.debug("SLURMEnvironment.set_world_size was called, but setting world size is not allowed. Ignored.")
[docs] def global_rank(self) -> int: return int(os.environ["SLURM_PROCID"])
def set_global_rank(self, rank: int) -> None: log.debug("SLURMEnvironment.set_global_rank was called, but setting global rank is not allowed. Ignored.")
[docs] def local_rank(self) -> int: return int(os.environ["SLURM_LOCALID"])
[docs] def node_rank(self) -> int: return int(os.environ["SLURM_NODEID"])
def resolve_root_node_address(self, root_node: str) -> str: if "[" in root_node: name, numbers = root_node.split("[", maxsplit=1) number = numbers.split(",", maxsplit=1)[0] if "-" in number: number = number.split("-")[0] number = re.sub("[^0-9]", "", number) root_node = name + number return root_node

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