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[TRTLLM-16212][feat] Unified caching via TRTLLM_CACHE_DIR environment variable - #18897
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WalkthroughThe PR adds unified compiled-artifact cache configuration. It initializes cache defaults, preserves explicit settings, forwards cache variables to MPI workers, derives FlashInfer workspace paths, and configures DeepGEMM isolation. ChangesUnified cache configuration
Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Application
participant _prepare_environment
participant MpiPoolSession
participant MPIWorker
participant trtllm-llmapi-launch
Application->_prepare_environment: initialize unified cache defaults
_prepare_environment->>MpiPoolSession: provide configured cache environment
MpiPoolSession->>MPIWorker: forward approved cache variables
Application->>trtllm-llmapi-launch: start LLM API launcher
trtllm-llmapi-launch->>MPIWorker: provide derived FlashInfer workspace
Merge Risk: 🟡 Moderate · up to This change centralizes cache configuration and worker cache isolation, but unresolved workspace-isolation behavior and missing Ray DeepGEMM mode coverage could cause workers to use unintended shared or isolated cache paths. Resolve these concerns before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 15.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 6 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@tensorrt_llm/executor/ray/gpu_worker.py`:
- Around line 78-81: Add CPU-only tests for RayWorkerWrapper.__init__ covering
both DG_JIT_CACHE_DIR cases: preserve an existing environment value and create
the tempfile-based rank/GPU fallback when absent. Mock Ray and CUDA interactions
so the tests do not require GPU or Ray runtime, and assert the resulting
environment values.
In `@tensorrt_llm/llmapi/mpi_session.py`:
- Around line 557-558: Ensure the cache-propagation branch in
MpiPoolSession._start_mpi_pool remains exercised by CPU-only mocked tests. In
tests/unittest/test_unified_cache.py at lines 95-96 and 126-127, remove the
unnecessary ENABLE_MULTI_DEVICE skips from the mocked environment-forwarding and
FlashInfer-selection tests, using precise capability gating for CPU-only cache
behavior; no direct change is required in tensorrt_llm/llmapi/mpi_session.py
lines 557-558 beyond preserving coverage of that branch.
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docs/source/llm-api/index.mdtensorrt_llm/__init__.pytensorrt_llm/_bootstrap.pytensorrt_llm/executor/ray/gpu_worker.pytensorrt_llm/llmapi/mpi_session.pytensorrt_llm/llmapi/trtllm-llmapi-launchtests/unittest/llmapi/test_mpi_session.pytests/unittest/test_unified_cache.py
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Inline comments:
In `@tensorrt_llm/llmapi/trtllm-llmapi-launch`:
- Around line 95-97: Update the cache-root handling around TRTLLM_CACHE_DIR and
the FLASHINFER_WORKSPACE_BASE export so a leading ~/ remains unresolved when
HOME is unset; fail clearly or use the documented unique-workspace fallback
instead of producing an absolute /unified path. Add or update a regression test
covering TRTLLM_CACHE_DIR=~/unified with no HOME and verify the resulting
failure or fallback behavior.
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chienchunhung
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Thanks for the PR! The proposed unification direction is sound. I left 2 inline comments.
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Inline comments:
In `@tensorrt_llm/llmapi/mpi_session.py`:
- Around line 577-587: Add a test case in the unified-cache tests covering
_start_mpi_pool when TRTLLM_CACHE_DIR is set and
TRTLLM_FLASHINFER_WORKSPACE_PER_PROCESS is “0”; assert that python_args is None
and FLASHINFER_WORKSPACE_BASE remains in worker_env, while preserving the
existing isolation-enabled coverage.
In `@tensorrt_llm/llmapi/trtllm-llmapi-launch`:
- Around line 91-92: Update configure_flashinfer_workspace so it distinguishes
explicit FLASHINFER_WORKSPACE_BASE overrides from the cache-derived bootstrap
default; return early only for explicit values, while assigning rank-specific
workspace and lock setup for inherited defaults. Add a launcher regression test
covering TRTLLM_CACHE_DIR initialization and asserting the inherited value
becomes a managed rank-0 workspace.
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docs/source/llm-api/index.mdtensorrt_llm/llmapi/mpi_session.pytensorrt_llm/llmapi/trtllm-llmapi-launchtests/unittest/llmapi/test_mpi_session.pytests/unittest/test_unified_cache.py
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Inline comments:
In `@tensorrt_llm/executor/ray/gpu_worker.py`:
- Line 76: The existing tests need coverage for both
TRTLLM_DEEP_GEMM_CACHE_PER_PROCESS modes in the RayWorkerWrapper cache setup.
Extend test_unified_cache.py with focused tests that mock Ray and CUDA,
instantiate RayWorkerWrapper, and verify that value "0" preserves
DG_JIT_CACHE_DIR while the default mode appends the rank/GPU-specific suffix.
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docs/source/llm-api/index.mdtensorrt_llm/executor/ray/gpu_worker.py
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chienchunhung
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Reviewed b5438c2. The update fixes the launcher path-expansion defect. FlashInfer and Ray retain separate cache paths for each worker. I found no remaining P0 or P1 code issues.
Two P2 items (non-blocking):
- Complete the test coverage. In test_unified_cache.py, add a case with
TRTLLM_FLASHINFER_WORKSPACE_PER_PROCESS=0. Add Ray tests for default isolation andTRTLLM_DEEP_GEMM_CACHE_PER_PROCESS=0. Also test preservation of explicit cache paths. Remove the multi-device requirement from the mocked MPI tests. The new module is absent from the CI test lists. Add it to the applicable list, or identify it as a local or QA test module. - Clarify explicit cache-path precedence. In gpu_worker.py, an explicit
DG_JIT_CACHE_DIRequal to<TRTLLM_CACHE_DIR>/deep_gemmchanges to a per-worker path. The documentation says explicit values take precedence. Preserve the explicit value, or document this exception. Add a test for this case.
Overall LGTM once these are addressed. Thanks for the PR!
- Clarifying in the docs that in order to disable per-worker isolation (if TRTLLM_DEEP_GEMM_CACHE_PER_PROCESS is not set), a path different from the default TRT-LLM unified cache must be chosen; - Adding test for cache isolation under Ray. Signed-off-by: Alessio Netti <26897207+AlessioNetti@users.noreply.github.com>
…y, add test_unified_cache.py to l0_cpu.yml Signed-off-by: Alessio Netti <26897207+AlessioNetti@users.noreply.github.com>
- Added FlashInfer coverage for TRTLLM_FLASHINFER_WORKSPACE_PER_PROCESS=0. - Added compact, parametrized Ray/DeepGEMM coverage for: - Default unified-cache isolation. - Explicit unified path isolation exception. - TRTLLM_DEEP_GEMM_CACHE_PER_PROCESS=0. - Preservation of a genuinely explicit cache path. - Added FlashInfer explicit-path preservation coverage. - Removed the multi-device skips from mocked MPI tests. - Made mocked MPIPoolExecutor injection work in CPU-only builds using raising=False. - Centralized isolation-environment cleanup in the fixture. Signed-off-by: Alessio Netti <26897207+AlessioNetti@users.noreply.github.com>
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Thanks for taking a look @chienchunhung - I addressed point 2 with commits b0cb42a and cb1211b, as well as point 1 with a5899dd. Tests are passing locally, will now re-run the CI. |
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ZhanruiSunCh
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LGTM for infra part.
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juney-nvidia
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Approved from trt-llm-devs perspective
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…fied cache tests NVIDIA#18897 (unified TRTLLM_CACHE_DIR caching) landed on main after the stale-forwarded-env fix was cherry-picked. Rebasing onto it: - the worker env bootstrap now drops the same variables MpiPoolSession forwards on main (TRTLLM*/TLLM*, _UNIFIED_CACHE_ENV_VARS, FLASHINFER_CUBIN_DIR, MASTER_ADDR/MASTER_PORT), so a stale unified cache variable cannot survive in a worker either; - the FlashInfer-isolated worker keeps NVIDIA#18897's TRTLLM_CACHE_DIR-derived workspace root. Every worker now starts with the env bootstrap, so update test_unified_cache.py the same way the cherry-pick updated test_flashinfer_workspace.py: plain workers run the bootstrap plus the mpi4py server main instead of python_args=None, and isolated workers run it in front of the FlashInfer bootstrap. Signed-off-by: qgai <qgai@nvidia.com>
…remote MPI failures and launcher shutdown Forward-port of release/1.3 PR NVIDIA#19664 (release/1.3 commit 54d1614) to main. Adapted to main's client sys.path propagation (NVIDIA#19494): the rewritten RemoteMpiCommSessionServer.serve() passes message.sys_path to task_wrapper, and the new server lifecycle test calls task_wrapper with an empty path. Main's TRTLLM_CACHE_DIR launcher test (NVIDIA#18897) now uses the shared launcher test helpers, so its stubbed MPI server waits for the stop request like the other launcher tests instead of exiting before the task. Signed-off-by: Chien-Chun Hung <2679986+chienchunhung@users.noreply.github.com> Signed-off-by: Simeng Liu <simengl@nvidia.com>
…fied cache tests NVIDIA#18897 (unified TRTLLM_CACHE_DIR caching) landed on main after the stale-forwarded-env fix was cherry-picked. Rebasing onto it: - the worker env bootstrap now drops the same variables MpiPoolSession forwards on main (TRTLLM*/TLLM*, _UNIFIED_CACHE_ENV_VARS, FLASHINFER_CUBIN_DIR, MASTER_ADDR/MASTER_PORT), so a stale unified cache variable cannot survive in a worker either; - the FlashInfer-isolated worker keeps NVIDIA#18897's TRTLLM_CACHE_DIR-derived workspace root. Every worker now starts with the env bootstrap, so update test_unified_cache.py the same way the cherry-pick updated test_flashinfer_workspace.py: plain workers run the bootstrap plus the mpi4py server main instead of python_args=None, and isolated workers run it in front of the FlashInfer bootstrap. Signed-off-by: qgai <qgai@nvidia.com>
…fied cache tests NVIDIA#18897 (unified TRTLLM_CACHE_DIR caching) landed on main after the stale-forwarded-env fix was cherry-picked. Rebasing onto it: - the worker env bootstrap now drops the same variables MpiPoolSession forwards on main (TRTLLM*/TLLM*, _UNIFIED_CACHE_ENV_VARS, FLASHINFER_CUBIN_DIR, MASTER_ADDR/MASTER_PORT), so a stale unified cache variable cannot survive in a worker either; - the FlashInfer-isolated worker keeps NVIDIA#18897's TRTLLM_CACHE_DIR-derived workspace root. Every worker now starts with the env bootstrap, so update test_unified_cache.py the same way the cherry-pick updated test_flashinfer_workspace.py: plain workers run the bootstrap plus the mpi4py server main instead of python_args=None, and isolated workers run it in front of the FlashInfer bootstrap. Signed-off-by: qgai <qgai@nvidia.com>
Dev Engineer Review
TRTLLM_CACHE_DIRas the default root for framework and compiler caches.HOMEduring launcher workspace setup.QA Engineer Review
~/expansion, unset-HOMEhandling, and managed-workspace behavior.Per-File QA Perspective
docs/source/llm-api/index.md: Verify documented cache precedence, worker propagation, DeepGEMM persistence, and FlashInfer isolation.tensorrt_llm/__init__.py: Verify bootstrap comments match environment initialization order.tensorrt_llm/_bootstrap.py: Verify unified cache defaults apply only when variables are unset and configure DeepGEMM correctly.tensorrt_llm/executor/ray/gpu_worker.py: Verify explicitDG_JIT_CACHE_DIRvalues remain unchanged and fallback paths remain rank- and GPU-specific.tensorrt_llm/llmapi/mpi_session.py: Verify approved cache variables reach MPI workers without changing existing environment forwarding.tensorrt_llm/llmapi/trtllm-llmapi-launch: Verify workspace expansion, explicit workspace precedence, trailing-slash handling, standalone~handling, and the unset-HOMEfallback.tests/unittest/llmapi/test_mpi_session.py: Covers launcher expansion and managed-workspace behavior. No integration test-list entry changed.tests/unittest/test_unified_cache.py: Covers unified-cache setup, overrides, initialization ordering, MPI propagation, DeepGEMM settings, and FlashInfer isolation. No integration test-list entry changed.Description
TRT-LLM currently uses a large variety of caches (e.g., Flashinfer, DeepGEMM, auto-tuner) that can all be configured via separate environment variables, which is cumbersome for end users. At the same time, leveraging warmed-up caches is a good way to speed up TRT-LLM startup and avoid re-compilation of JIT artifacts.
This PR simplifies the above by introducing a
TRTLLM_CACHE_DIRenvironment variable which, when set, sets a single root cache directory, under which all known framework caches will be contained. At the momentTRTLLM_CACHE_DIRcontrols the following:TLLM_AUTOTUNER_CACHE_PATHTORCHINDUCTOR_CACHE_DIRTRITON_CACHE_DIRTORCH_EXTENSIONS_DIRFLASHINFER_WORKSPACE_BASECUTE_DSL_CACHE_DIRDG_JIT_CACHE_DIRTRTLLM_DG_CACHE_DIRCUDA_CACHE_PATHIf any of these variables is explicitly set alongside
TRTLLM_CACHE_DIR, then the framework-specific environment variables will take precedence. Also note that theTRTLLM_DG_JIT_DUMP_CUBINenvironment variable will be set automatically together withTRTLLM_CACHE_DIR, in order to enable cubin dumping in DeepGEMM atTRTLLM_DG_CACHE_DIR. Additional caches could be added in the future using the same mechanism.The unified caching implementation does not collide with the per-rank cache isolation mechanism implemented for Flashinfer: generally, isolation will be enabled if neither of
TRTLLM_CACHE_DIRorFLASHINFER_WORKSPACE_BASEare set.Test Coverage
A series of focused tests was added to ensure that cache priorities are respected (e.g., individual framework caches over
TRTLLM_CACHE_DIR), that Flashinfer isolation works as expected, and that the proper environment variables are passed from the main process to the MPI workers.