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Returning the use of the proper stream in allreduce #382

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merged 2 commits into from
Jan 23, 2025
Merged

Returning the use of the proper stream in allreduce #382

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Returning the use of the proper stream in allreduce
gshtras Jan 23, 2025
fdc3642
Merge branch 'main' into bring_stream_back
gshtras Jan 23, 2025
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5 changes: 3 additions & 2 deletions vllm/distributed/parallel_state.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,8 @@
import vllm.envs as envs
from vllm.distributed.utils import StatelessProcessGroup
from vllm.logger import init_logger
from vllm.utils import direct_register_custom_op, supports_custom_op
from vllm.utils import (current_stream, direct_register_custom_op,
supports_custom_op)

if TYPE_CHECKING:
from vllm.config import VllmConfig
Expand Down Expand Up @@ -365,7 +366,7 @@ def _all_reduce_out_place(self, input_: torch.Tensor) -> torch.Tensor:
return out
pynccl_comm = self.pynccl_comm
assert pynccl_comm is not None
out = pynccl_comm.all_reduce(input_)
out = pynccl_comm.all_reduce(input_, stream=current_stream())
if out is None:
# fall back to the default all-reduce using PyTorch.
# this usually happens during testing.
Expand Down
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