[https://nvbugs/6426834][fix] Deflake test_kv_transfer: cap NIXL progress threads, pin UCX env by chuangz0 · Pull Request #16708 · NVIDIA/TensorRT-LLM

chuangz0 · 2026-07-22T04:36:33Z

test_transfer_worker_v2[tp4_pp1_to_tp2_pp2] (and other multi-worker cases) intermittently hit the 120s per-test timeout in CI. Root cause: each NIXL transfer agent spawns TRTLLM_NIXL_NUM_THREADS (default 8) busy-polling UCX progress threads, and a single case builds up to 8 TransferWorkers (64 spinning threads per pytest process). On CI nodes shared by up to 8 single-GPU Jenkins agents the resulting CPU oversubscription inflates agent construction from ~3s to ~27s each, so 8 agents alone exceed the 120s timeout depending on neighbor load.

Measured on an H100 node with 4 concurrent pytest processes: 8 agents take ~178s with the default 8 progress threads vs ~23s with 1 thread.

Fix, applied to all unit tests that create real UCX/NIXL transfer agents (test_kv_transfer.py, test_kv_transfer_mp.py, test_agent.py, test_agent_multi_backends.py, test_cache_transceiver_single_process.py, test_py_cache_transceiver_mp.py, test_deepseek_v4_kv_transfer.py, test_mamba_transfer.py, others/test_kv_cache_transceiver.py):

Set TRTLLM_NIXL_NUM_THREADS=1 with an explicit assignment (not setdefault, so an externally supplied value cannot defeat the cap): these tests verify transfer logic, not transfer-engine threading (sender-side KV_TRANSFER_NUM_THREADS worker threads are unchanged).
Force UCX_TLS=^ib,gdr_copy with an explicit assignment instead of the previous setdefault, which was inert in CI (the CI agent bootstrap exports UCX_TLS before pytest starts).

Un-waive the affected case.

Validation: 8 concurrent whole-file runs x 5 iterations (40 runs) on one H100 node under CI-parity env all passed; before the fix the same setup timed out in the first iteration on every GPU.

Dev Engineer Review

Standardizes UCX/NIXL test configuration across KV-transfer and transceiver tests:
- Forces UCX_TLS=^ib,gdr_copy.
- Limits TRTLLM_NIXL_NUM_THREADS to 1 to prevent CPU oversubscription.
Configuration changes are consistent and scoped to tests using real UCX/NIXL agents.
The affected KV-transfer test waiver was removed; the unrelated proxy shutdown test was added to waives.txt with valid formatting.
No public APIs or test logic were changed. CI completed successfully, including 40 whole-file runs on an H100 node.

QA Engineer Review

Modified test modules configure runtime environments; no test functions were added, modified, or removed.
The previously waived unittest/disaggregated/test_kv_transfer.py::test_transfer_worker_v2[tp4_pp1_to_tp2_pp2] is now un-waived.
Test coverage is validated by the successful CI pipeline and 40 repeated whole-file runs.
Verdict: sufficient

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chuangz0 · 2026-07-22T04:37:11Z

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Walkthrough

The changes make UCX and NIXL environment settings deterministic across disaggregated, transceiver, and cache tests, and replace one integration-test waiver entry.

Changes

Test environment configuration

Layer / File(s)	Summary
Disaggregated transport setup `tests/unittest/disaggregated/test_kv_transfer.py`, `tests/unittest/disaggregated/test_kv_transfer_mp.py`, `tests/unittest/disaggregated/test_mamba_transfer.py`, `tests/integration/test_lists/waives.txt`	Disaggregated tests force `UCX_TLS` to `^ib,gdr_copy` and `TRTLLM_NIXL_NUM_THREADS` to `1`; the waiver changes from a KV-transfer case to a proxy-session shutdown test.
Transceiver environment setup `tests/unittest/disaggregated/test_agent*.py`, `tests/unittest/disaggregated/test_cache_transceiver_single_process.py`, `tests/unittest/disaggregated/test_py_cache_transceiver_mp.py`, `tests/unittest/others/test_kv_cache_transceiver.py`	Transceiver and cache tests override `UCX_TLS` and set `TRTLLM_NIXL_NUM_THREADS` to `1`, while removing the previous `0` fallback in the single-process cache test.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

NVIDIA/TensorRT-LLM#8027: Updates the same integration waiver list.
NVIDIA/TensorRT-LLM#9008: Changes SKIP entries in the same waiver configuration.
NVIDIA/TensorRT-LLM#9566: Adds and removes pytest SKIP entries in the same waiver list.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the main fix by capping NIXL threads and pinning UCX env to deflake tests.
Description check	✅ Passed	The description explains the issue, fix, and validation, but the template sections are not fully populated in their designated places.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@tests/unittest/disaggregated/test_kv_transfer.py`:
- Around line 18-25: Make the NIXL thread cap deterministic by replacing
os.environ.setdefault() with an explicit TRTLLM_NIXL_NUM_THREADS assignment to
"1" in tests/unittest/disaggregated/test_kv_transfer.py lines 18-25 and
tests/unittest/disaggregated/test_kv_transfer_mp.py lines 15-18. Both test
modules must override any externally supplied value.

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tests/integration/test_lists/waives.txt
tests/unittest/disaggregated/test_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer_mp.py

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tests/integration/test_lists/waives.txt

tensorrt-cicd · 2026-07-22T04:43:18Z

PR_Github #60883 [ run ] triggered by Bot. Commit: 76d642a Link to invocation

tensorrt-cicd · 2026-07-22T05:33:15Z

PR_Github #60883 [ run ] completed with state SUCCESS. Commit: 76d642a
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Inline comments:
In `@tests/unittest/disaggregated/test_kv_transfer.py`:
- Around line 8-20: Clear any inherited UCX_NET_DEVICES setting before
configuring transfer tests by adding os.environ.pop("UCX_NET_DEVICES", None) in
tests/unittest/disaggregated/test_kv_transfer.py lines 8-20,
tests/unittest/disaggregated/test_mamba_transfer.py lines 23-26, and
tests/unittest/disaggregated/test_deepseek_v4_kv_transfer.py lines 40-45. Apply
this alongside the existing UCX_TLS setup in each test module so UCX device
selection is not externally forced.

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📒 Files selected for processing (10)

tests/integration/test_lists/waives.txt
tests/unittest/disaggregated/test_agent.py
tests/unittest/disaggregated/test_agent_multi_backends.py
tests/unittest/disaggregated/test_cache_transceiver_single_process.py
tests/unittest/disaggregated/test_deepseek_v4_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer_mp.py
tests/unittest/disaggregated/test_mamba_transfer.py
tests/unittest/disaggregated/test_py_cache_transceiver_mp.py
tests/unittest/others/test_kv_cache_transceiver.py

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tests/integration/test_lists/waives.txt

🚧 Files skipped from review as they are similar to previous changes (6)

tests/unittest/disaggregated/test_kv_transfer_mp.py
tests/unittest/disaggregated/test_agent.py
tests/unittest/disaggregated/test_agent_multi_backends.py
tests/unittest/disaggregated/test_py_cache_transceiver_mp.py
tests/unittest/others/test_kv_cache_transceiver.py
tests/unittest/disaggregated/test_cache_transceiver_single_process.py

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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@tests/unittest/disaggregated/test_mamba_transfer.py`:
- Around line 23-27: Remove inherited UCX_NET_DEVICES before configuring UCX in
both NIXL test modules: add the environment-variable removal before the UCX
assignments in tests/unittest/disaggregated/test_mamba_transfer.py lines 23-27
and tests/unittest/disaggregated/test_agent.py lines 9-12, leaving the existing
UCX_TLS and TRTLLM_NIXL_NUM_THREADS settings unchanged.

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📒 Files selected for processing (10)

tests/integration/test_lists/waives.txt
tests/unittest/disaggregated/test_agent.py
tests/unittest/disaggregated/test_agent_multi_backends.py
tests/unittest/disaggregated/test_cache_transceiver_single_process.py
tests/unittest/disaggregated/test_deepseek_v4_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer_mp.py
tests/unittest/disaggregated/test_mamba_transfer.py
tests/unittest/disaggregated/test_py_cache_transceiver_mp.py
tests/unittest/others/test_kv_cache_transceiver.py

🚧 Files skipped from review as they are similar to previous changes (7)

tests/unittest/others/test_kv_cache_transceiver.py
tests/unittest/disaggregated/test_agent_multi_backends.py
tests/unittest/disaggregated/test_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer_mp.py
tests/unittest/disaggregated/test_cache_transceiver_single_process.py
tests/unittest/disaggregated/test_deepseek_v4_kv_transfer.py
tests/unittest/disaggregated/test_py_cache_transceiver_mp.py

…ress threads, pin UCX env test_transfer_worker_v2[tp4_pp1_to_tp2_pp2] (and other multi-worker cases) intermittently hit the 120s per-test timeout in CI. Root cause: each NIXL transfer agent spawns TRTLLM_NIXL_NUM_THREADS (default 8) busy-polling UCX progress threads, and a single case builds up to 8 TransferWorkers (64 spinning threads per pytest process). On CI nodes shared by up to 8 single-GPU Jenkins agents the resulting CPU oversubscription inflates agent construction from ~3s to ~27s each, so 8 agents alone exceed the 120s timeout depending on neighbor load. Measured on an H100 node with 4 concurrent pytest processes: 8 agents take ~178s with the default 8 progress threads vs ~23s with 1 thread. Fix, applied to test_kv_transfer.py and test_kv_transfer_mp.py: - setdefault TRTLLM_NIXL_NUM_THREADS=1: these tests verify transfer logic, not transfer-engine threading (sender-side KV_TRANSFER_NUM_THREADS worker threads are unchanged). - Force UCX_TLS=^ib,gdr_copy and drop UCX_NET_DEVICES instead of the previous setdefault, which was inert in CI (the CI agent bootstrap exports UCX_TLS before pytest starts) and broke local runs on clusters whose container runtime injects UCX_TLS/UCX_NET_DEVICES defaults. Un-waive the affected case. Validation: 8 concurrent whole-file runs x 5 iterations (40 runs) on one H100 node under CI-parity env all passed; before the fix the same setup timed out in the first iteration on every GPU. Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>

…t tests Address review: assign TRTLLM_NIXL_NUM_THREADS explicitly instead of setdefault so an externally supplied value cannot defeat the single-progress-thread cap, and apply the same deterministic env (UCX_TLS=^ib,gdr_copy, drop UCX_NET_DEVICES, TRTLLM_NIXL_NUM_THREADS=1) to every unit test that creates real UCX/NIXL transfer agents, not just test_kv_transfer*.py. Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>

…nsceiver unit tests Keep only UCX_TLS pinning and the NIXL progress-thread cap; removing UCX_NET_DEVICES from the environment is not needed. Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>

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Actionable comments posted: 2

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⚠️ Outside diff range comments (1)

tests/unittest/disaggregated/test_cache_transceiver_single_process.py (1)
924-925: 🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win

Do not silently skip one-sided missing indexer data.

If either side returns None while the other contains data, this continue makes the transfer test pass without verifying that the cache was received. Only skip when both sides are None; otherwise raise an assertion identifying the request and layer.
Proposed fix
 if ctx_data is None or gen_data is None:
+    assert ctx_data is None and gen_data is None, (
+        f"Missing indexer data at req={req_idx} layer={layer_idx}"
+    )
     continue
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@tests/unittest/disaggregated/test_cache_transceiver_single_process.py` around
lines 924 - 925, Update the conditional in the transfer test around ctx_data and
gen_data so it continues only when both are None; when exactly one is missing,
raise an assertion that identifies the request and layer, and preserve normal
verification when both contain data.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@tests/unittest/disaggregated/test_agent_multi_backends.py`:
- Around line 6-10: Clear the inherited UCX_NET_DEVICES environment variable
alongside the forced UCX_TLS and TRTLLM_NIXL_NUM_THREADS settings, before the
subprocess environment is copied for launching test_agent.py. Use os.environ
removal so externally injected device selections cannot be propagated.

In `@tests/unittest/disaggregated/test_cache_transceiver_single_process.py`:
- Around line 31-34: Update the deterministic UCX/NIXL environment setup near
UCX_TLS and TRTLLM_NIXL_NUM_THREADS to unset UCX_NET_DEVICES as well, preventing
inherited cluster or CI values from overriding the test configuration.

---

Outside diff comments:
In `@tests/unittest/disaggregated/test_cache_transceiver_single_process.py`:
- Around line 924-925: Update the conditional in the transfer test around
ctx_data and gen_data so it continues only when both are None; when exactly one
is missing, raise an assertion that identifies the request and layer, and
preserve normal verification when both contain data.

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Create a new PR with the fixes

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📒 Files selected for processing (9)

tests/integration/test_lists/waives.txt
tests/unittest/disaggregated/test_agent.py
tests/unittest/disaggregated/test_agent_multi_backends.py
tests/unittest/disaggregated/test_cache_transceiver_single_process.py
tests/unittest/disaggregated/test_kv_transfer.py
tests/unittest/disaggregated/test_kv_transfer_mp.py
tests/unittest/disaggregated/test_mamba_transfer.py
tests/unittest/disaggregated/test_py_cache_transceiver_mp.py
tests/unittest/others/test_kv_cache_transceiver.py

🚧 Files skipped from review as they are similar to previous changes (7)

tests/integration/test_lists/waives.txt
tests/unittest/disaggregated/test_agent.py
tests/unittest/disaggregated/test_py_cache_transceiver_mp.py
tests/unittest/disaggregated/test_kv_transfer_mp.py
tests/unittest/disaggregated/test_mamba_transfer.py
tests/unittest/others/test_kv_cache_transceiver.py
tests/unittest/disaggregated/test_kv_transfer.py

…e re-added during rebase (fixed by NVIDIA#16630) Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>

chuangz0 · 2026-07-24T02:48:12Z

/bot skip --comment "all tests have passed"

tensorrt-cicd · 2026-07-24T02:55:44Z

PR_Github #61474 [ skip ] triggered by Bot. Commit: 127e7f4 Link to invocation

tensorrt-cicd · 2026-07-24T03:01:55Z

PR_Github #61474 [ skip ] completed with state SUCCESS. Commit: 127e7f4
Skipping testing for commit 127e7f4

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chuangz0 requested review from a team as code owners July 22, 2026 04:36

chuangz0 requested review from BowenFu, QiJune, Tabrizian, chienchunhung, dpitman-nvda, fredricz-20070104, niukuo and ruodil July 22, 2026 04:36

github-actions Bot assigned chuangz0 Jul 22, 2026

chuangz0 force-pushed the fix/kv-transfer-flaky-nixl-threads branch from a544a5b to 76d642a Compare July 22, 2026 04:37

coderabbitai Bot reviewed Jul 22, 2026

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Comment thread tests/unittest/disaggregated/test_kv_transfer.py Outdated

chuangz0 requested a review from Shixiaowei02 July 22, 2026 08:31

chuangz0 force-pushed the fix/kv-transfer-flaky-nixl-threads branch from c032f12 to 72e39ad Compare July 22, 2026 08:31

Shixiaowei02 approved these changes Jul 22, 2026

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Comment thread tests/integration/test_lists/waives.txt

chuangz0 changed the title ~~[https://nvbugs/6426834][fix] Deflake test_kv_transfer: cap NIXL progress threads, pin UCX env~~ [https://nvbugs/6426834][fix] fix ucx env in test_kv_transfer.py Jul 22, 2026

chuangz0 changed the title ~~[https://nvbugs/6426834][fix] fix ucx env in test_kv_transfer.py~~ [https://nvbugs/6426834][fix] Deflake test_kv_transfer: cap NIXL progress threads, pin UCX env Jul 22, 2026

chuangz0 force-pushed the fix/kv-transfer-flaky-nixl-threads branch from 72e39ad to 624d927 Compare July 22, 2026 08:52

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Comment thread tests/unittest/disaggregated/test_kv_transfer.py

chuangz0 force-pushed the fix/kv-transfer-flaky-nixl-threads branch from 624d927 to 124d808 Compare July 23, 2026 02:48

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Comment thread tests/unittest/disaggregated/test_mamba_transfer.py

chuangz0 added 2 commits July 23, 2026 09:38

chuangz0 force-pushed the fix/kv-transfer-flaky-nixl-threads branch from 124d808 to fd6764d Compare July 23, 2026 09:47

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Comment thread tests/unittest/disaggregated/test_agent_multi_backends.py

Comment thread tests/unittest/disaggregated/test_cache_transceiver_single_process.py

chzblych approved these changes Jul 23, 2026

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Comment thread tests/unittest/disaggregated/test_agent.py

[https://nvbugs/6426834][chore] Drop stale test_proxy_fast_death waiv…

127e7f4

…e re-added during rebase (fixed by NVIDIA#16630) Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>

chuangz0 enabled auto-merge (squash) July 24, 2026 02:47

chuangz0 merged commit 7d3a4e9 into NVIDIA:main Jul 24, 2026
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