[https://nvbugs/5769890][fix] enable system memory to transfer active message in NIXL ucx

[chuangz0]

Summary by CodeRabbit

• Tests
  • Enhanced test environment configurations for disaggregated model testing scenarios.
  • Updated test skip list to reflect current test status across multiple test modules.

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[chuangz0]

/bot run --add-multi-gpu-test

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes add the UCX_MM_ERROR_HANDLING environment variable configured to "y" across multiple disaggregated test runner functions, and update the test waive-list by removing three disaggregated benchmark test waivers while adding three new test waivers.

Changes

Cohort / File(s)	Summary
Environment Configuration tests/integration/defs/disaggregated/test_disaggregated.py	Added UCX_MM_ERROR_HANDLING = "y" to run_env in run_disaggregated_test, run_disaggregated_benchmark, and run_disaggregated_aiperf; also added to env in test_disaggregated_deepseek_v3_lite_fp8_nixl path
Test Waive List tests/integration/test_lists/waives.txt	Removed three SKIP waivers for disaggregated benchmark tests (llama-3.1-8b-instruct-hf-fp8, DeepSeek-V3-Lite-bf16, llama-v3-8b-hf); added three new SKIP waivers for triton_server, flashinfer_star_attn, and ray_orchestrator tests

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is incomplete. The template sections for 'Description' and 'Test Coverage' are empty with only the placeholder comments present. No substantive content explains what was changed, why it was necessary, or what tests validate the changes.	Fill in the 'Description' section explaining the issue and solution, and the 'Test Coverage' section listing relevant tests that validate the changes in the PR.
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly follows the required format with NVBugs ID and [fix] type, accurately describing the main change of enabling system memory for active message transfer in NIXL UCX.

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[coderabbitai]

Actionable comments posted: 0

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

tests/integration/defs/disaggregated/test_disaggregated.py (1)

1-1: Update the copyright year to include 2026.

The copyright header shows "2022-2024" but the file has been meaningfully modified in 2026. As per coding guidelines, the copyright header should reflect the year of the latest meaningful modification.

Suggested fix

-# SPDX-FileCopyrightText: Copyright (c) 2022-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-FileCopyrightText: Copyright (c) 2022-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.

🧹 Nitpick comments (1)

tests/integration/defs/disaggregated/test_disaggregated.py (1)

1186-1194: Consider removing redundant UCX_MM_ERROR_HANDLING setting.

This line is redundant since run_disaggregated_test (line 365) now sets UCX_MM_ERROR_HANDLING=y unconditionally in run_env. The value set here will be overwritten by the runner.

If the intent is to document that this test specifically requires this setting, a comment would be clearer. Otherwise, consider removing this line for consistency with other tests that rely on the runner's defaults.

Option: Remove redundant setting

     env = llm_venv._new_env.copy()
     env["TRTLLM_USE_NIXL_KVCACHE"] = "1"
     env["UCX_TLS"] = "^ib"
-    env["UCX_MM_ERROR_HANDLING"] = "y"
     run_disaggregated_test(disaggregated_example_root,

📜 Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 11da7e3 and f7175c3.

📒 Files selected for processing (2)

• tests/integration/defs/disaggregated/test_disaggregated.py
• tests/integration/test_lists/waives.txt

💤 Files with no reviewable changes (1)

• tests/integration/test_lists/waives.txt

🧰 Additional context used

📓 Path-based instructions (2)

**/*.py

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Files:

• tests/integration/defs/disaggregated/test_disaggregated.py

**/*.{cpp,cc,cxx,h,hpp,hxx,cu,cuh,py}

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Files:

• tests/integration/defs/disaggregated/test_disaggregated.py

🧠 Learnings (4)

📓 Common learnings

Learnt from: tongyuantongyu
Repo: NVIDIA/TensorRT-LLM PR: 7781
File: tests/integration/test_lists/waives.txt:313-313
Timestamp: 2025-09-17T02:48:52.732Z
Learning: In TensorRT-LLM, `tests/integration/test_lists/waives.txt` is specifically for waiving/skipping tests, while other test list files like those in `test-db/` and `qa/` directories are for different test execution contexts (pre-merge, post-merge, QA tests). The same test appearing in both waives.txt and execution list files is intentional - the test is part of test suites but will be skipped due to the waiver.

📚 Learning: 2025-09-09T09:40:45.658Z

Learnt from: fredricz-20070104
Repo: NVIDIA/TensorRT-LLM PR: 7645
File: tests/integration/test_lists/qa/llm_function_core.txt:648-648
Timestamp: 2025-09-09T09:40:45.658Z
Learning: In TensorRT-LLM test lists, it's common and intentional for the same test to appear in multiple test list files when they serve different purposes (e.g., llm_function_core.txt for comprehensive core functionality testing and llm_function_core_sanity.txt for quick sanity checks). This duplication allows tests to be run in different testing contexts.

Applied to files:

• tests/integration/defs/disaggregated/test_disaggregated.py

📚 Learning: 2025-07-28T17:06:08.621Z

Learnt from: moraxu
Repo: NVIDIA/TensorRT-LLM PR: 6303
File: tests/integration/test_lists/qa/examples_test_list.txt:494-494
Timestamp: 2025-07-28T17:06:08.621Z
Learning: In TensorRT-LLM testing, it's common to have both CLI flow tests (test_cli_flow.py) and PyTorch API tests (test_llm_api_pytorch.py) for the same model. These serve different purposes: CLI flow tests validate the traditional command-line workflow, while PyTorch API tests validate the newer LLM API backend. Both are legitimate and should coexist.

Applied to files:

• tests/integration/defs/disaggregated/test_disaggregated.py

📚 Learning: 2025-08-01T15:14:45.673Z

Learnt from: yibinl-nvidia
Repo: NVIDIA/TensorRT-LLM PR: 6506
File: examples/models/core/mixtral/requirements.txt:3-3
Timestamp: 2025-08-01T15:14:45.673Z
Learning: In TensorRT-LLM, examples directory can have different dependency versions than the root requirements.txt file. Version conflicts between root and examples dependencies are acceptable because examples are designed to be standalone and self-contained.

Applied to files:

• tests/integration/defs/disaggregated/test_disaggregated.py

🧬 Code graph analysis (1)

tests/integration/defs/disaggregated/test_disaggregated.py (2)

tests/unittest/llmapi/apps/_test_disagg_serving_multi_nodes.py (1)

• env (66-74)

tests/unittest/llmapi/apps/_test_disagg_serving_multi_nodes_service_discovery.py (1)

• env (48-56)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Pre-commit Check

🔇 Additional comments (3)

tests/integration/defs/disaggregated/test_disaggregated.py (3)

1495-1497: LGTM!

Consistent addition of UCX_MM_ERROR_HANDLING alongside the existing UCX_TLS setting in the benchmark runner.

---

1676-1678: LGTM!

Consistent addition of UCX_MM_ERROR_HANDLING alongside the existing UCX_TLS setting in the aiperf runner.

---

363-365: Clarify whether UCX_MM_ERROR_HANDLING=y should apply globally or only to NIXL tests.

The global setting at line 365 applies this variable to all disaggregated tests regardless of backend (MPI, PyTorch, UCX, NIXL), but the code shows inconsistent patterns: the NIXL-specific test explicitly sets UCX_MM_ERROR_HANDLING=y before calling the runner (suggesting it's NIXL-specific), while the UCX test only sets UCX_TLS="^ib" and relies on the global setting. Additionally, no official UCX documentation exists for UCX_MM_ERROR_HANDLING (web search found no reference in OpenUCX docs), so verify this variable is correct and intentionally global rather than NIXL-conditional.

[tensorrt-cicd]

PR_Github #31552 [ run ] triggered by Bot. Commit: f7175c3

[tensorrt-cicd]

PR_Github #31552 [ run ] completed with state SUCCESS. Commit: f7175c3
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[chuangz0]

/bot run --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #31668 [ run ] triggered by Bot. Commit: c86398c

[tensorrt-cicd]

PR_Github #31668 [ run ] completed with state SUCCESS. Commit: c86398c
/LLM/main/L0_MergeRequest_PR pipeline #24497 completed with status: 'FAILURE'

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[chuangz0]

/bot run --add-multi-gpu-test --disable-fail-fast

[chuangz0]

/bot run --add-multi-gpu-test --disable-fail-fast

[chuangz0]

/bot run --add-multi-gpu-test --disable-fail-fast

[tensorrt-cicd]

PR_Github #32045 [ run ] triggered by Bot. Commit: 804b3af

[tensorrt-cicd]

PR_Github #32045 [ run ] completed with state SUCCESS. Commit: 804b3af
/LLM/main/L0_MergeRequest_PR pipeline #24835 completed with status: 'FAILURE'

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[pcastonguay]

/bot run --add-multi-gpu-test --disable-fail-fast

[chuangz0]

/bot run --add-multi-gpu-test --disable-fail-fast

[pcastonguay]

/bot run --add-multi-gpu-test --disable-fail-fast

[tensorrt-cicd]

PR_Github #32305 [ run ] triggered by Bot. Commit: f506909

[tensorrt-cicd]

PR_Github #32305 [ run ] completed with state SUCCESS. Commit: f506909
/LLM/main/L0_MergeRequest_PR pipeline #25034 completed with status: 'FAILURE'

⚠️ Action Required:

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[pcastonguay]

/bot run --add-multi-gpu-test --disable-fail-fast

[tensorrt-cicd]

PR_Github #32339 [ run ] triggered by Bot. Commit: f506909

[tensorrt-cicd]

PR_Github #32339 [ run ] completed with state SUCCESS. Commit: f506909
/LLM/main/L0_MergeRequest_PR pipeline #25058 completed with status: 'SUCCESS'