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[None][test] auto reuse torch empty cache on qa test by crazydemo · Pull Request #7421 · NVIDIA/TensorRT-LLM · GitHub
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@crazydemo crazydemo commented Sep 1, 2025

Summary by CodeRabbit

  • Tests
    • Automatically clear CUDA GPU memory cache before each integration test to reduce cross-test interference, memory pressure, and flakiness on GPU-enabled systems.
    • Removed redundant per-test fixture usage in a disaggregated single-GPU test, aligning it with the new automatic behavior and simplifying test setup.
    • No changes to product behavior; improvements are limited to test stability and maintainability.

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@crazydemo crazydemo force-pushed the dev-hook branch 2 times, most recently from b4b9e9b to aaeac71 Compare September 1, 2025 05:57
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coderabbitai bot commented Sep 1, 2025

📝 Walkthrough

Walkthrough

Autouse is enabled for the torch_empty_cache fixture in tests/integration/defs/conftest.py, causing it to run before each test automatically. The explicit @pytest.mark.usefixtures("torch_empty_cache") decorator is removed from a test in tests/integration/defs/disaggregated/test_disaggregated_single_gpu.py. No other logic changes.

Changes

Cohort / File(s) Summary
PyTest fixture behavior update
tests/integration/defs/conftest.py
Changed fixture decorator from @pytest.fixture to @pytest.fixture(autouse=True) for torch_empty_cache; fixture body unchanged.
Test decorator cleanup
tests/integration/defs/disaggregated/test_disaggregated_single_gpu.py
Removed @pytest.mark.usefixtures("torch_empty_cache") from test_disaggregated_spec_dec_batch_slot_limit since the fixture is now autouse.

Sequence Diagram(s)

sequenceDiagram
    autonumber
    participant Pytest Runner as Pytest Runner
    participant Autouse Fixture as torch_empty_cache (autouse)
    participant Test as test_disaggregated_spec_dec_batch_slot_limit

    Pytest Runner->>Autouse Fixture: Setup (before each test)
    Note right of Autouse Fixture: Empty CUDA cache if available
    Autouse Fixture-->>Pytest Runner: Teardown/return
    Pytest Runner->>Test: Execute test
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Reviewing files that changed from the base of the PR and between 2b286ae and aaeac71.

📒 Files selected for processing (2)
  • tests/integration/defs/conftest.py (1 hunks)
  • tests/integration/defs/disaggregated/test_disaggregated_single_gpu.py (0 hunks)
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  • tests/integration/defs/disaggregated/test_disaggregated_single_gpu.py
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🔇 Additional comments (1)
tests/integration/defs/conftest.py (1)

2391-2398: Prune redundant manual CUDA cache clears
Tests still contain explicit torch.cuda.empty_cache() invocations (e.g. tests/unittest/conftest.py:56, tests/unittest/bindings/test_bindings_ut.py:497, tests/integration/defs/examples/test_multimodal.py:88, …). Audit each call: remove ones now covered by the new autouse fixture, and for tests that truly require in-test cache resets, annotate them with keep_torch_cache.

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@xinhe-nv xinhe-nv enabled auto-merge (squash) September 1, 2025 06:02
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PR_Github #17162 [ run ] triggered by Bot

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PR_Github #17162 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #12904 completed with status: 'FAILURE'

Signed-off-by: Ivy Zhang <25222398+crazydemo@users.noreply.github.com>
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/bot run

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PR_Github #17286 [ run ] triggered by Bot

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PR_Github #17286 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #12993 completed with status: 'SUCCESS'

@xinhe-nv xinhe-nv merged commit 3799e5d into NVIDIA:main Sep 2, 2025
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3 participants