[None][feat] Add a link mode to the precompiled editable-install path - #18752
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Included review availability: Your plan provides up to 12 included reviews per hour; 10 remain after this review. WalkthroughThe build setup adds opt-in symlink reuse for local precompiled artifacts and warns about native-input changes between revisions. Attention modules and tests update imports to relocated interface and KV-cache modules. ChangesPrecompiled artifact reuse
Attention import path updates
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adds opt-in local symlink reuse for precompiled artifacts while preserving copy mode and updates relocated attention imports. The documented validation and focused tests cover the changed behaviors, with no concrete current-head merge-blocking risk identified. Sequence Diagram(s)sequenceDiagram
participant setup.py
participant LocalPrecompiledDirectory
participant GitRepository
participant DestinationCheckout
setup.py->>LocalPrecompiledDirectory: validate local precompiled input
setup.py->>GitRepository: compare source revisions and native inputs
GitRepository-->>setup.py: return comparison result
setup.py->>DestinationCheckout: link artifacts and handle fmha_sm100
setup.py-->>DestinationCheckout: copy artifacts when link mode is disabled
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@scripts/build_wheel.py`:
- Around line 830-831: Update the launcher setup branch around
launcher.is_file() to remove the managed venv launcher when the source launcher
is absent, while preserving the existing skip message. Add a regression test
that runs setup, deletes the source launcher, reruns setup, and verifies the
venv launcher no longer exists.
- Around line 926-927: Update the build flow around setup_venv() and main() so
python_only mode skips setup_conan() entirely before entering
setup_python_only(). Add a regression test invoking main(python_only=True) that
verifies setup_conan() is not called, while preserving Conan setup for
non-Python-only builds.
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scripts/build_wheel.pytests/unittest/others/test_build_wheel_python_only.py
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brnguyen2
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Inline comments:
In `@tests/unittest/others/test_precompiled_link_mode.py`:
- Around line 66-70: Update the test’s environment handling around extract to
preserve the original TRTLLM_PRECOMPILED_LINK value and restore it afterward,
including deleting it only when it was initially absent; alternatively use the
test framework’s monkeypatch.setenv mechanism. Keep the link-specific value
during extract.
- Line 73: Update the test helper or fixture around _run and
TRTLLM_PRECOMPILED_LINK to capture the environment variable’s original value
before each test and restore it in a finally block, including reinstating an
existing value and removing the variable when it was initially absent.
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docs/source/installation/build-from-source.mdsetup.pytests/unittest/others/test_precompiled_link_mode.py
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/bot skip --comment "build/packaging-only: setup.py precompiled link mode + docs + a CPU unit test (test_precompiled_link_mode.py); no runtime/kernel/GPU code, so GPU validation is not applicable" |
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…ts it The file lives under tests/unittest/others, which l0_cpu.yml pulls in as a directory. CPU stages run pytest with -m cpu_only, and tests/unittest/conftest.py ignores any file lacking a pytest.mark.cpu_only marker, so these tests were collected but never run. Add the module-level marker, matching the other cpu_only files in the directory. Signed-off-by: Brian Nguyen <brnguyen@nvidia.com>
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Added the missing `pytestmark = pytest.mark.cpu_only` marker (commit 9e0e1f9) so /bot run --stage-list "CPU-Generic-x86-1,CPU-Generic-arm-1" |
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CPU validation passed — skipping the full GPU premerge. Justification:
/bot skip --comment "build/packaging-only (setup.py link mode + docs + CPU unit test); CPU unit tests pass on CPU-Generic-x86/arm in build 59292; no runtime/kernel/GPU code; prior GPU failure was B300 SLURM infra" |
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/bot skip --comment "build/packaging-only (setup.py link mode + docs + CPU unit test); CPU unit tests pass on CPU-Generic-x86/arm in build 59292; no runtime/kernel/GPU code; prior GPU failure was B300 SLURM infra" |
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/bot skip --comment "build/packaging-only (setup.py link mode + docs + CPU unit test); the new test_precompiled_link_mode.py (12 tests) passes on CPU-Generic-x86/arm in L0_MergeRequest_PR #59292 (commit 9e0e1f9); no runtime/kernel/GPU code; prior GPU failure was B300 AWS-SLURM infra" CPU validation passed; skipping the full GPU premerge (justification in the skip comment above). Review is already APPROVED. |
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/bot skip --comment "build/packaging-only (setup.py link mode + docs + CPU unit test); test_precompiled_link_mode.py (12 tests) passes on CPU-Generic-x86/arm in L0_MergeRequest_PR #59292 (commit 9e0e1f9); no runtime/kernel/GPU code; prior GPU failure was B300 AWS-SLURM infra; review approved" |
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6 participants
Description
This replaces the
build_wheel.py --python_onlyflag this PR originally proposed. Review pointed out the overlap with the documentedTRTLLM_USE_PRECOMPILED/TRTLLM_PRECOMPILED_LOCATIONeditable-install workflow, and on re-readingsetup.pythe overlap turned out to be most of the feature:TRTLLM_PRECOMPILED_LOCATIONalready accepts a local directory in git-clone layout, so setting a second checkout up from an existing build with no download is supported today.pip install -e .[devel]works;sanity_check()only trips whentensorrt_llm/bindingsor3rdparty/fmha_sm100are missing. Thefmha_sm100ImportError quoted in the original description is the no-artifacts case, so it did not justify a separate mode.One difference remained. The local-directory branch of
extract_from_precompiledcopies: every matched artifact plus a fullcopytreeof3rdparty/fmha_sm100. When several checkouts share one built tree that duplicates gigabytes per checkout, and it actively undoes a symlink-based sharing setup, since the existing code unlinks a symlinked3rdparty/fmha_sm100and replaces it with a real directory.TRTLLM_PRECOMPILED_LINK=1symlinks the artifacts instead:TRTLLM_PRECOMPILED_LINK=1 TRTLLM_PRECOMPILED_LOCATION=/path/to/built/checkout pip install -e .An existing
3rdparty/fmha_sm100symlink is left in place rather than replaced, so a checkout that already shares a build tree keeps its links. The flag only applies to a local directory, since a wheel or a URL has no build tree to point at; combining them raises a clear error instead of silently copying. Without the variable the path still copies, so default behavior is unchanged.Reusing a build also makes it possible to reuse a stale one, and the failure mode is an import error about rebuilding that gives no hint where the mismatch came from. A local-directory source now warns when the two checkouts sit on different commits and any of
cpp/,3rdparty/,setup.py,scripts/build_wheel.pyorrequirements.txtdiffer between them, naming both commits and the first few differing files. It warns for copy mode as well, since the artifacts are equally stale either way. It never fails the install: the two checkouts are normally meant to differ, and only some of those differences matter, so this is advice rather than a gate. If either side is not a git repository, or the two commits are not both reachable (unrelated clones do not share an object store), it says so once and moves on.Putting this inside the existing path rather than beside it keeps one documented interface, keeps the result a real editable install (dist metadata, extras, and the console scripts that
setup.pydeclares), and is a much smaller diff than a second build mode.The unrelated
--installbug that rode along on the earlier version of this PR has been split out into its own PR.Test Coverage
tests/unittest/others/test_precompiled_link_mode.py(new, 10 cases, CPU-only, nothing written outsidetmp_path): link mode symlinks the artifacts at the expected targets, keeps a pre-existing3rdparty/fmha_sm100symlink, replaces a stale real file left by an earlier copy-mode install, leaves copy mode byte-for-byte unchanged, and rejects a wheel with a clear error. The skew warning is covered withsubprocess.runstubbed: matching commits and differing-but-not-natively warn nothing, differing native inputs produce the warning with both commits and the file names, an unreachable revision falls back to the generic warning, and a non-repository is reported and skipped.setup.pycannot be imported (module scope callssetup()), so the test pulls the two functions under test out of its AST and executes them on their own; they are self-contained apart fromos.Also verified end to end on a built checkout shared by two editable worktrees: both installed with link mode, every compiled artifact in both resolved as a symlink into the shared tree,
3rdparty/fmha_sm100stayed a symlink rather than a copied directory,import tensorrt_llmandimport tensorrt_llm.bindingsresolved into the respective worktree in each venv,trtllm-serve --helpran from each venv, a Python edit made in one worktree was visible only in that worktree's venv,tests/unittest/utils/test_logger.pypassed from both venvs, and the shared build tree was unmodified afterwards.PR Checklist
Please review the following before submitting your PR:
PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.
PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.
Test cases are provided for new code paths (see test instructions)
If PR introduces API changes, an appropriate PR label is added - either
api-compatibleorapi-breaking. Forapi-breaking, includeBREAKINGin the PR title.Any new dependencies have been scanned for license and vulnerabilities
CODEOWNERS updated if ownership changes
Documentation updated as needed
Update tava architecture diagram if there is a significant design change in PR.
The reviewers assigned automatically/manually are appropriate for the PR.
Please check this after reviewing the above items as appropriate for this PR.
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/bot help.Dev Engineer Review
TRTLLM_PRECOMPILED_LINK=1for local precompiled directories.3rdparty/fmha_sm100symlinks.QA Engineer Review
tests/unittest/others/test_precompiled_link_mode.pywith 10 CPU-only tests for symlink creation, symlink preservation, stale-file replacement, copy mode, validation, revision matching, native-input filtering, diff failures, and non-Git execution.tests/unittest/_torch/attention/test_backends_importable.py.tests/integration/test_lists/,test-db/, orqa/.