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# Copyright 2024 Bytedance Ltd. and/or its affiliates
#
# 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 time
import ray
from cupy.cuda.nccl import NcclCommunicator, get_unique_id
from ray.util import list_named_actors
@ray.remote
class NCCLIDStore:
def __init__(self, nccl_id):
self._nccl_id = nccl_id
def get(self):
return self._nccl_id
def get_nccl_id_store_by_name(name):
all_actors = list_named_actors(all_namespaces=True)
matched_actors = [actor for actor in all_actors if actor.get("name", None) == name]
if len(matched_actors) == 1:
actor = matched_actors[0]
return ray.get_actor(**actor)
elif len(matched_actors) > 1:
logging.warning("multiple actors with same name found: %s", matched_actors)
elif len(matched_actors) == 0:
logging.info("failed to get any actor named %s", name)
return None
def create_nccl_communicator_in_ray(rank: int, world_size: int, group_name: str, max_retries: int = 100, interval_s: int = 5):
if rank == 0:
nccl_id = get_unique_id()
nccl_id_store = NCCLIDStore.options(name=group_name).remote(nccl_id)
assert ray.get(nccl_id_store.get.remote()) == nccl_id
communicator = NcclCommunicator(
ndev=world_size,
commId=nccl_id,
rank=0,
)
return communicator
else:
for i in range(max_retries):
nccl_id_store = get_nccl_id_store_by_name(group_name)
if nccl_id_store is not None:
logging.info("nccl_id_store %s got", group_name)
nccl_id = ray.get(nccl_id_store.get.remote())
logging.info("nccl id for %s got: %s", group_name, nccl_id)
communicator = NcclCommunicator(
ndev=world_size,
commId=nccl_id,
rank=rank,
)
return communicator
logging.info("failed to get nccl_id for %d time, sleep for %d seconds", i + 1, interval_s)
time.sleep(interval_s)
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