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feat: load whole-forward FPM data from external parquet - #167
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📝 SummaryRisk level: Medium. Human attention should focus on:
Changed behavior and public contracts
Evidence supplied
Evidence still missing
WalkthroughThe change adds external FPM Parquet configuration, validation, loading, caching, runtime propagation, and test coverage across Rust and Python APIs. Documentation and CLI configuration now describe the required metadata sidecar and external artifact workflow. ChangesExternal FPM Parquet support
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟡 Moderate · up to AFD companion configurations with non-default backend or parallelism overrides can use the wrong timing identity or reject a matching external FPM artifact. This should be fixed before merge. 🚥 Pre-merge checks | ✅ 8✅ Passed checks (8 passed)
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Signed-off-by: Simone Chen <maxmoe0105@gmail.com>
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Inline comments:
In `@crates/core/src/perfmodel/engine/runtime.rs`:
- Around line 455-459: Update Engine::from_spec_bytes and the
PerfDatabase::load_resolved_shared_in flow to validate the exact external-FPM
shape before loading the database. Pass a dedicated external-FPM
directory-allowance flag to the backend/version directory check, while keeping
tolerate_missing_data false for external FPM so the shared-table memo remains
active and invalid non-FPM specs cannot bypass validation.
In `@crates/core/src/perfmodel/perf_database/fpm_forward.rs`:
- Around line 1451-1456: Extend the runtime test coverage for an explicit
external FPM pair: in
crates/core/src/perfmodel/perf_database/fpm_forward.rs:1451-1456, load a valid
temporary parquet and .metadata.json pair via fpm_parquet_path without
backend/version data, then run prefill and decode and assert the expected
numerical results; retain the existing missing-file test. In
crates/core/src/perfmodel/perf_database/mod.rs:1029-1033 and
tests/test_unified_traffic_runtime.py:287-294, update only as needed to preserve
or support this coverage, with no direct change required unless their current
tests are the relevant missing-file or external-path cases.
- Around line 11-12: Update the module-level path documentation near
fpm_parquet_path to show the metadata sidecar as the parquet filename with its
.parquet suffix replaced by .metadata.json, such as <configured
path>.metadata.json, so the documented files match the loader’s expected pair.
In `@crates/core/src/perfmodel/py.rs`:
- Around line 1457-1460: Update ForwardPassPerfModel::from_native to reject
non-UTF-8 fpm_parquet_path values before constructing EngineBuildRequest,
replacing the lossy to_string_lossy conversion with explicit UTF-8 validation
and propagating an appropriate error; preserve valid UTF-8 paths unchanged.
In `@crates/core/src/python.rs`:
- Line 278: Update AicTimingModel::build to validate fpm_parquet_path before
forwarding it: reject empty paths and reject any configured path unless
forward_model is Some("fpm"). Ensure invalid configuration returns an error
rather than falling back to op-level timing data.
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20-22: LGTM!README.md (1)
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REQUEST_CHANGES · 5.5/10 · high confidence
What this PR does
This PR removes the checked-in B200 and H200 whole-forward FPM datasets and adds an external fpm_parquet_path across prediction YAML, Python, PyO3, Rust configuration, and the Rust FPM parquet loader. The loader retains sidecar digest, schema, row-count, and identity validation while allowing covered FPM cells to run without an in-repository backend/version directory.
The external loader preserves the existing fail-closed sidecar and row-identity checks, includes the configured path in the shared-table identity, documents the intended public surfaces, and adds focused arbitrary-stem and directory-less loader tests.
Why this score
The technical score is 5.5 and the recommendation is REQUEST_CHANGES. The basic external prediction path works and the focused and parity suites are green, but two P1 contract failures remain: recommendation lowering drops the accepted external path before candidate execution, and the direct Python/Rust core APIs silently accept an FPM path on an op-level engine and return op-level predictions. The external path also disables the existing shared-table memo, there is no checked-in successful final-consumer regression, and two narrower path/documentation issues remain.
Signed-off-by: Simone Chen <simonec@nvidia.com>
Signed-off-by: Simone Chen <simonec@nvidia.com>
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Signed-off-by: Simone Chen <simonec@nvidia.com>
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Inline comments:
In `@crates/core/src/perfmodel/engine/runtime.rs`:
- Around line 2593-2602: Extend external FPM validation coverage beyond
Engine::from_spec_bytes construction by adding a valid FPM-shaped engine case
with a missing parquet or invalid metadata sidecar. Invoke the first FPM query
that reaches FpmForwardTable::cells(), then assert it returns the expected loud
error instead of silently succeeding. Keep the existing invalid-engine-config
assertions unchanged.
In `@docs/core-api.md`:
- Around line 141-143: Update the whole-forward prediction documentation around
forward_model and fpm_parquet_path to state that the path accepts either
relative or absolute values, with relative paths resolved from the process
working directory. Remove the claim that an absolute path is required while
preserving the existing guidance about direct file access.
In `@README.md`:
- Around line 16-18: Update the Whole-forward FPM runtime-data documentation to
state that fpm_parquet_path must point to a Parquet file accompanied by the
adjacent same-stem .metadata.json sidecar, and clarify that both files are
required for loading.
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🔀 Multi-repo context ai-dynamo/dynamo, ai-dynamo/aiconfigurator
Linked repositories findings
ai-dynamo/dynamo
- Dynamo has no
fpm_parquet_pathoraic_fpm_parquet_pathconsumer. Its AIC fields remain identity/configuration values only incomponents/src/dynamo/common/configuration/groups/aic_perf_args.py:12-40;aic_estimator.py:51-67loads the bundled database by system/backend/version. [::ai-dynamo/dynamo::] - Dynamo pins
aisimulate==0.12.0.dev2inpyproject.toml:17,container/deps/requirements.aisimulate.txt:5, andaisimulate-core==0.12.0-dev.2inCargo.toml:59. The feature therefore requires the deployed AISimulate wheel/core version to contain the new API. [::ai-dynamo/dynamo::]
ai-dynamo/aiconfigurator
- The public API compatibility test pins the exact
compile_enginesignature intests/cross_package/test_core_public_api.py:66-76. Addingfpm_parquet_pathrequires updating this signature contract. [::ai-dynamo/aiconfigurator::] - The Rust loader derives the sidecar with
parquet_path.with_extension("metadata.json")and validates schema version, identity, digest, and row count inaic-core/rust/aiconfigurator-core/src/perf_database/fpm_forward.rs:327-475, matching the PR’s same-stem sidecar contract. [::ai-dynamo/aiconfigurator::]
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5-9: LGTM!crates/core/src/perfmodel/engine/runtime.rs (2)
2592-2603: 🗄️ Data Integrity & IntegrationTest does not exercise a missing external file with a valid FPM shape.
external_fpm_rejects_invalid_specs_before_database_loadingusescontext_ops()/generation_ops(), the hand-built non-FPM op lists (noFpmForwardop). For the"/missing/reviewed-fpm.parquet"case,shape_okis false regardless of the path, so the error asserted here is "requires forward_model='fpm' ... exactly one FpmForward op per phase", not a file-not-found failure. The test name promises rejection of an invalid path "before database loading," but the missing-file scenario is never actually tested with a valid FPM op shape.Add a case that builds a genuinely valid FPM spec (leading
FpmForwardop per phase) with a nonexistentfpm_parquet_path, and confirm it still fails loudly atEngine::from_spec_bytes.
338-353: LGTM!Also applies to: 380-401, 436-436, 472-472, 490-515, 1938-1938, 2550-2560, 2573-2591
crates/core/src/perfmodel/py.rs (2)
1324-1335: 🗄️ Data Integrity & IntegrationMissing-path tests never pair a valid FPM shape with a nonexistent file.
Both
builder_rejects_invalid_fpm_paths_before_entering_pythonandnative_model_rejects_invalid_fpm_pathsuse("/missing/fpm.parquet", "op_level")/ an unsetforward_model.validate_fpm_parquet_pathrejects these becauseis_fpmis false, not because the file is missing. Neither test proves that a genuinely valid FPM spec with a missing external file fails before entering Python / before database loading.Also applies to: 1884-1894
1033-1033: LGTM!Also applies to: 1078-1078, 1094-1099, 1231-1231, 1253-1253, 1273-1276, 1291-1292, 1309-1322, 1364-1367, 1398-1398, 1443-1455, 1480-1489, 1858-1858, 1896-1909
crates/core/src/python.rs (2)
2243-2252: 🗄️ Data Integrity & IntegrationMissing-path test pairs the nonexistent file with
forward_model="op_level".The
"/missing/fpm.parquet"case in this loop usesmodel="op_level", sovalidate_fpm_parquet_pathrejects it for shape mismatch, not for the missing file. Add a case withforward_model="fpm"and a spec-compatible shape to confirm a missing external file is rejected before Python compilation runs.
188-189: LGTM!Also applies to: 290-293, 313-313, 1831-1831, 2254-2270
crates/core/src/perfmodel/config.rs (1)
140-145: LGTM!python/aisimulate/src/aiconfigurator_core/sdk/engine.py (1)
291-291: LGTM!Also applies to: 319-319, 427-427, 437-441, 495-495, 573-573, 621-621
python/aisimulate/src/aisimulate/compiler.py (1)
303-319: LGTM!Also applies to: 366-367
python/aisimulate/src/aiconfigurator_core/sdk/memory.py (1)
299-299: LGTM!Also applies to: 325-329
python/aisimulate/src/aisimulate/config/engine.py (1)
144-144: LGTM!Also applies to: 160-164
python/aisimulate/src/aisimulate/recommend.py (1)
370-370: LGTM!Also applies to: 763-764
python/aisimulate/src/aisimulate/runner.py (1)
92-92: LGTM!tests/test_cli_config.py (1)
18-18: LGTM!Also applies to: 808-828, 924-969
Arsene12358
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Request changes on 4a6717415a4a59da874f284820559d15cb031f53.
The primary external-parquet workflow works: the new synthetic pair drives real replay and CLI details without backend timing directories, invalid configurations are rejected, and the Rust and engine parity suites pass. Three verified findings remain, detailed in the inline comments.
Spec: two P1 findings
- Accepted relative paths can select a different external dataset through cache reuse or lazy loading after a working-directory change. A dataset containing a 99 ms prefill returned 22 ms from another pair; its absolute-path control returned 99 ms.
- The regular prefill/decode companion in an AFD+PD deployment accepts an external FPM path but drops it at its final estimator. This affects a companion explicitly configured for external FPM; the AFD attention/FFN workers themselves, pure AFD, and companions using
op_levelare unaffected.
Standards: one P2 finding
- The intentional new
compile_engineparameter is missing from the frozen public API signature expectation, causingtest_stable_function_signaturesto fail.
Independent validation on the reviewed head
| Suite | Result |
|---|---|
cargo test -p aisimulate-core --features python |
1,458 passed; 1 ignored |
| Config, runner, unified traffic, and sweeper tests | 806 passed; 5 downstream integration cases skipped |
| FPM, memory, KV budget, and cross-package tests | 258 passed; 1 failed, the signature contract |
test_engine_step_parity.py and test_compile_engine_parity.py |
383 passed; no golden changes |
Both runtime defects were independently reproduced and reverified with synthetic external parquet/sidecar pairs. Those fixtures establish the input-selection and execution failures, not predictive accuracy against silicon. Tests ran locally on macOS ARM64 with CPython 3.12 and a native extension rebuilt from this commit; pytest used -p no:timeout as documented for macOS.
Signed-off-by: Simone Chen <simonec@nvidia.com>
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@python/aisimulate/src/aisimulate/runner.py`:
- Around line 234-244: Update the external-FPM branch of
AICAFDCompanionPerformanceModel.measure, specifically compile_kwargs before
EngineHandle.compile, to extract the accepted AIC timing fields, translate dtype
names into compile_engine’s *_quant_mode parameters, and forward systems_path.
Do not add attention_backend until the replay schema supports it, and add a
companion replay case covering a non-default FPM identity with a custom systems
root.
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🧠 Learnings (1)
📓 Common learnings
Learnt from: CR
Repo: ai-dynamo/aisimulate
Timestamp: 2026-09-17T16:41:55.684Z
Learning: Use `<type>: <short description>` for every AISimulate PR title.
🔀 Multi-repo context ai-dynamo/dynamo, ai-dynamo/aiconfigurator
Linked repositories findings
ai-dynamo/dynamo
- Dynamo’s AIC configuration and replay payloads expose backend, system, model, version, and parallelism fields, but no
fpm_parquet_path/aic_fpm_parquet_pathforwarding path. [::ai-dynamo/dynamo::] - The Rust callback builds AIC through
AicEngineBuilderwithout an external parquet-path argument inlib/bindings/python/rust/llm/aic_callback.rs. [::ai-dynamo/dynamo::] - Dynamo pins
aisimulate==0.12.0.dev2andaisimulate-core==0.12.0-dev.2, with tests enforcing exact matching releases. External-FPM support therefore requires deploying the corresponding updated AISimulate wheel and crate together. [::ai-dynamo/dynamo::]
ai-dynamo/aiconfigurator
- The frozen compatibility reference still defines
compile_enginewithoutfpm_parquet_pathinaic-core/src/aiconfigurator_core/sdk/engine.py:358-392, and its exact-signature contract is enforced intests/cross_package/test_core_public_api.py:66-76. Legacy consumers using this API cannot pass the new keyword until migrated. - Its Rust FPM loader derives the adjacent sidecar with
parquet_path.with_extension("metadata.json")and validates identity, digest, schema, and row count, matching the PR’s external parquet/sidecar contract. [::ai-dynamo/aiconfigurator::]
🔇 Additional comments (4)
README.md (1)
17-20: LGTM!docs/cli/user-guide.md (1)
1004-1004: LGTM!Also applies to: 1093-1098
docs/core-api.md (1)
142-144: LGTM!Also applies to: 191-191
python/aisimulate/tests/cross_package/test_core_public_api.py (1)
88-88: 🎯 Functional CorrectnessThe linked test is not a cross-repository comparison.
ai-dynamo/aiconfigurator/tests/cross_package/test_core_public_api.pyimports its ownaiconfigurator_core.sdk.engine.compile_engine, andpyproject.tomlpinsaiconfigurator-core==0.12.0. The local test belongs to the separateaisimulatedistribution. Therefore, this AISimulate parameter does not cause the linked exact-signature test to fail, and the frozen compatibility contract does not need updating for this release.
Signed-off-by: Simone Chen <simonec@nvidia.com>
Signed-off-by: Simone Chen <simonec@nvidia.com>
Signed-off-by: Simone Chen <simonec@nvidia.com>
Signed-off-by: Simone Chen <simonec@nvidia.com>
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Inline comments:
In `@python/aisimulate/src/aisimulate/runner.py`:
- Line 227: Update AICAFDCompanionPerformanceModel.measure to call
_pop_aic_timing_overrides before selecting timing values, then read
aic_forward_model and aic_fpm_parquet_path from its canonical result so plain
forward_model and fpm_parquet_path aliases reach the EngineHandle branch. Add a
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🔀 Multi-repo context ai-dynamo/dynamo, ai-dynamo/aiconfigurator
Linked repositories findings
ai-dynamo/dynamo
- The Rust AIC callback constructs
AicEngineBuilderwith model, system, backend, versions, quantization, and parallelism, but does not setforward_modelorfpm_parquet_path(lib/bindings/python/rust/llm/aic_callback.rs:150-205). [::ai-dynamo/dynamo::] - Replay/config payloads expose
aic_backend,aic_system,aic_backend_version, andaic_model_path, with no external FPM path field (components/src/dynamo/profiler/utils/replay_optimize/engine_args.py:27-31). [::ai-dynamo/dynamo::] - Dynamo pins both
aisimulate-coreandaisimulateto0.12.0(Cargo.toml:58-59,pyproject.toml:17,container/deps/requirements.aisimulate.txt:5). External-FPM support requires coordinated deployment of the updated AISimulate packages. [::ai-dynamo/dynamo::]
ai-dynamo/aiconfigurator
- The compatibility reference’s
compile_enginesignature ends atforward_modeland has nofpm_parquet_pathparameter (aic-core/src/aiconfigurator_core/sdk/engine.py:358-383). Its exact-signature test enforces this older contract (tests/cross_package/test_core_public_api.py:66-76). [::ai-dynamo/aiconfigurator::] - Its native
AicEngineBuilderrequest likewise containsforward_modelandsystems_path, but no external FPM parquet-path field (aic-core/rust/aiconfigurator-core/src/py.rs:960-1045). [::ai-dynamo/aiconfigurator::] - The existing FPM loader derives the required sidecar using
parquet_path.with_extension("metadata.json")(aic-core/rust/aiconfigurator-core/src/perf_database/fpm_forward.rs:450-485), matching the PR’s sidecar naming contract. [::ai-dynamo/aiconfigurator::]
🔇 Additional comments (5)
README.md (1)
17-23: LGTM!crates/core/parity_tests/perfmodel/README.md (1)
107-110: LGTM!Also applies to: 127-127
docs/ci.md (1)
279-284: LGTM!docs/core-api.md (1)
157-201: LGTM!Also applies to: 214-214
.github/prediction-numerical-sentinels.json (1)
3-3: 🎯 Functional CorrectnessThe SHA resolves to a valid commit, and the current sentinel values match the manifest at that commit. The available evidence does not establish that this is the intended baseline or that the sentinel runner reproduces the values, so the proposed stale-golden failure cannot be decided from the supplied evidence.
Signed-off-by: Simone Chen <simonec@nvidia.com>
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@python/aisimulate/src/aisimulate/runner.py`:
- Line 187: Update the flow around _pop_aic_timing_overrides so every accepted
override—backend_version, pp, moe_tp_size, and moe_ep_size—is either applied
consistently to kwargs and compile_kwargs used by both compiled execution and
the legacy estimator, or explicitly rejected for AFD companions. Ensure
unsupported values fail loudly, and add coverage for non-default backend version
and parallelism overrides.
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🔀 Multi-repo context ai-dynamo/dynamo, ai-dynamo/aiconfigurator
Linked repositories findings
ai-dynamo/dynamo
- The Rust AIC callback constructs
AicEngineBuilderwithout settingforward_modelorfpm_parquet_path(lib/bindings/python/rust/llm/aic_callback.rs:150-205). [::ai-dynamo/dynamo::] - Replay/config payloads expose AIC backend, system, version, and model-path fields but no external FPM path (
components/src/dynamo/profiler/utils/replay_optimize/engine_args.py:27-31). [::ai-dynamo/dynamo::] - Dynamo pins
aisimulate-coreandaisimulateto0.12.0(Cargo.toml:58-59,pyproject.toml:17,container/deps/requirements.aisimulate.txt:5). External-FPM support therefore requires coordinated package upgrades. [::ai-dynamo/dynamo::]
ai-dynamo/aiconfigurator
- The compatibility reference’s
compile_engineAPI has nofpm_parquet_pathparameter, and its exact-signature test enforces that older contract (aic-core/src/aiconfigurator_core/sdk/engine.py:358-383,tests/cross_package/test_core_public_api.py:66-76). [::ai-dynamo/aiconfigurator::] - Its native
AicEngineBuilderrequest also lacks an external FPM parquet-path field (aic-core/rust/aiconfigurator-core/src/py.rs:960-1045). [::ai-dynamo/aiconfigurator::] - The existing FPM loader derives the sidecar as
parquet_path.with_extension("metadata.json"), matching the PR’s same-stem.metadata.jsoncontract (aic-core/rust/aiconfigurator-core/src/perf_database/fpm_forward.rs:450-485). [::ai-dynamo/aiconfigurator::]
Signed-off-by: Yiming Liu <yimingl@nvidia.com>
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All identified review findings are addressed at 09e7ff7. The original path, companion execution, and API contract fixes are verified. Conflicting companion identity settings now fail before prediction, while matching settings remain accepted.
Validation: 296 focused Python tests passed, including real external-FPM companion replay for both phases. Changed-file and CI-scoped Ruff, formatting, and documentation checks passed. Required CI remains a separate merge gate.
Preserve external FPM inputs through the canonical estimator API and the aisimulate_core package move. Keep static integration for AFD+PD companions and preserve per-role paths through replay, recommendations, and cache identity. Retain main's engine controls, diagnostics, and regression coverage while resolving the conflicts around removed bundled FPM data. Signed-off-by: Yiming Liu <yimingl@nvidia.com>
Arsene12358
dismissed
jasonqinzhou’s stale review
September 20, 2026 13:41
I think all issues are already addressed
Signed-off-by: Yiming Liu <yimingl@nvidia.com>
Retain NumPy sampling and external FPM imports in the replay runner. Signed-off-by: Yiming Liu <yimingl@nvidia.com>
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/ok to test d539c4a |
This was referenced Sep 21, 2026
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Summary
fpm_parquet_pathacross prediction/recommendation YAML, Python, PyO3, and Rust APIs; remove the checked-in B200/H200 pairs.systems_path, using the same alias validation as regular replay.External parquet example
/data/reviewed-fpm.parquet/data/reviewed-fpm.metadata.jsonAIC_ALLOW_UNLISTED_VERSIONS=1.workers.prefill.timingandworkers.decode.timing; each role may use a different pair.Validation
Merged
mainatba64235aand resolved compiler/deployment metadata conflicts, preserving external FPM and speculative-decoding fields.cargo test -p aisimulate-core --features python: 1,519 passed, 1 ignored. Updated hand-built Rust fixtures to resolve declared FP8-block donors after the data correction onmain; assertions and production timing behavior are unchanged.Runner, AFD, configuration, and sweeper suites: 841 passed, 5 downstream integration-only skips.
FPM and cross-package public API suites: 81 passed. Ngram speculation and unified traffic suites: 69 passed. Python tests used
-p no:timeoutand the native extension rebuilt after the merge.Companion replay tests cover both phases, two output lengths, plain and
aic_precision names, all five quantization fields, and a system present only in the supplied custom systems directory with the environment override removed.Regression coverage also verifies live engines across directory changes, lazy loading after a directory change, and missing/corrupt external artifacts.
Synthetic pairs produce 22 ms prefill and 6 ms decode; a second dataset produces 99 ms prefill. These fixtures verify data selection and execution, not silicon accuracy.
Changed-file Ruff checks, Rust formatting, documentation links, whitespace, and packaged legal files passed.
CI baseline provenance now references permanent main commit
ba64235ainstead of a pre-squash PR commit. All eight numerical sentinels passed independently at that main commit and this PR, with exactly matching results; values, query inputs, and tolerances are unchanged.All 291 repository-policy tests passed locally using the CI tool versions.
Alias-routing follow-up (
38effc46): normalize plain andaic_timing-selection aliases before choosing external FPM. The four plain-name replay cases fail before the fix and pass afterward; 183 runner/AFD tests and 81 FPM/public API tests passed, including duplicate/invalid alias checks.