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nixl_ep: Unset UCX_NET_DEVICES #1164

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Merged
brminich merged 2 commits into from
Jan 7, 2026
Merged

nixl_ep: Unset UCX_NET_DEVICES #1164

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nixl_ep: Unset UCX_NET_DEVICES
itayalroy Dec 30, 2025
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itayalroy Jan 7, 2026
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16 changes: 1 addition & 15 deletions examples/device/ep/tests/elastic/elastic.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
# SPDX-FileCopyrightText: Copyright (c) 2025 DeepSeek
# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#
# This file incorporates material from the DeepSeek project, licensed under the MIT License.
# The modifications made by NVIDIA are licensed under the Apache License, Version 2.0.
Expand Down Expand Up @@ -466,20 +466,6 @@ def worker(torch_rank: int, args: argparse.Namespace):
torch.set_default_device("cuda")
torch.cuda.set_device(0)

# Initialize UCX
pxb_nics = [
"mlx5_0",
"mlx5_3",
"mlx5_4",
"mlx5_5",
"mlx5_6",
"mlx5_9",
"mlx5_10",
"mlx5_11",
]
tcp_nics = ",ibp154s0,ibp192s0,ibp206s0,ibp220s0,ibp94s0"
os.environ["UCX_NET_DEVICES"] = f"cuda0-{pxb_nics[local_rank]}:1" + tcp_nics

# Initialize NIXL
os.environ["NIXL_ETCD_ENDPOINTS"] = args.etcd_server

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