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fix: enable GLM-5.3-Flash Hopper FP8 KV on supported runtimes - #574
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title "fix: enable GLM-5.3-Flash Hopper FP8 KV on supported runtimes" names the main behavior change: Hopper FP8 KV is admitted on the runtime versions that support it. The changeset admits FP8 KV… |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
| Cross-Layer Contract | |
The changed runtime and KV contract is traced across the layers. Rust gates SM90 FP8 KV by backend-specific PEP 440 minimums and applies the gate during engine construction (readiness.rs:101-128, `r… |
| Modeling And Data Evidence | |
The PR supplies the required provenance and reproducible model evidence. The Rust operator cites the exact SGLang TileLang revision and file, while the synchronized notices describe the adaptation and… |
| Compatibility Boundaries | |
The compatibility boundary is synchronized. Rust uses backend-specific minimums: vLLM 0.32.0 and SGLang 0.5.22 in readiness.rs:110-120. Python now enforces the same backend/minimum pairing with a re… |
| Review Evidence | |
The description lists commands with results for Rust, Python, support-matrix, parity, lint, and formatting checks. It reports negative and boundary cases, including older and supported runtime version… |
| Description check | |
The description follows the repository template and covers the change, review map, compatibility risks, test commands and results, boundary cases, numerical derivation, provenance, and tracking. It do… |
Full details: Title check
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Explanation
The title "fix: enable GLM-5.3-Flash Hopper FP8 KV on supported runtimes" names the main behavior change: Hopper FP8 KV is admitted on the runtime versions that support it. The changeset admits FP8 KV for vLLM 0.32.0 and SGLang 0.5.22 and rejects older runtimes, so the title matches the change. The title follows the state-the-behavior guidance and avoids vague terms.
Full details: Cross-Layer Contract
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Explanation
The changed runtime and KV contract is traced across the layers. Rust gates SM90 FP8 KV by backend-specific PEP 440 minimums and applies the gate during engine construction (
readiness.rs:101-128,runtime.rs:445-448). Existing public serialization mapsbackend_versionandkvcache_quant_modeinto the engine configuration (python.rs:255-289,402-420). The operator model changes only SGLang Hopper latent QK/PV pricing (glm53flash.rs:494-515), with decode/prefill and vLLM/Blackwell regression coverage. Documentation records runtime requirements, flags, SOL behavior, and exact-runtime SILICON limits. The support-matrix classifier now pairs each backend with its own minimum through the backreference and explicit pair check (fpe_support_matrix.py:507-520), and tests cover both valid pairs and both cross-backend negative pairs (test_fpe_support_matrix.py:360-379). Immutable upstream revisions provide the stated compatibility evidence. No changed schema field or output lacks a traced consumer. Prior failure addressed: The classifier now enforces paired groups: vllm only accepts 0.32.0 and sglang only accepts 0.5.22. Added tests reject vllm with 0.5.22 and sglang with 0.32.0 while retaining stage, type, and extra-text checks.
Full details: Modeling And Data Evidence
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Explanation
The PR supplies the required provenance and reproducible model evidence. The Rust operator cites the exact SGLang TileLang revision and file, while the synchronized notices describe the adaptation and state that no kernel or performance data is vendored. The new arithmetic test uses controlled BF16/FP8 rates, documents the FLOP counts and expected decode/prefill deltas, and compares the changed SGLang SM90 path with unchanged SGLang SM100 and vLLM SM90 paths. The Python tests also preserve exact latency goldens and verify FP8/BF16 identity, runtime boundaries, and exact-runtime SILICON fallback behavior. The diff changes no performance-data tables and explicitly documents that the new path is analytical only.
Full details: Compatibility Boundaries
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Explanation
The compatibility boundary is synchronized. Rust uses backend-specific minimums: vLLM 0.32.0 and SGLang 0.5.22 in
readiness.rs:110-120. Python now enforces the same backend/minimum pairing with a regex backreference and exact pair check infpe_support_matrix.py:507-520; tests cover both cross-paired diagnostics and preserve build-stage, exception-type, and complete-message checks. No schema, binding, manifest, or data-file paths changed. The existing one-wheel/one-crate setup remains:pyproject.toml:104-122builds fromcrates/core/Cargo.toml, andCargo.toml:4-8has one workspace crate. The changed code adds no Dynamo dependency or import. Documentation states the same version boundaries and defaults indocs/glm53flash-native-contract.md:174-183anddocs/perf-model/support-matrix.md:59-67. Prior failure addressed:fpe_support_matrix.py:509-520now ties the captured backend to its minimum through\1and accepts only (vllm,0.32.0) or (sglang,0.5.22); tests attest_fpe_support_matrix.py:357-376reject both cross-paired diagnostics.
Full details: Review Evidence
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Explanation
The description lists commands with results for Rust, Python, support-matrix, parity, lint, and formatting checks. It reports negative and boundary cases, including older and supported runtime versions, prereleases, unknown labels, GPU generations, KV identities, missing data, and query errors. It separates local test results, parity results, public-API smoke evidence, and the absence of native-GPU or nightly production qualification. Fast CI and Full CI are marked pending, not cited as completed evidence. The PR diff changes no workflow files and does not cite inactive nested workflows as hosted CI evidence.
Full details: Description check
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Explanation
The description follows the repository template and covers the change, review map, compatibility risks, test commands and results, boundary cases, numerical derivation, provenance, and tracking. It does not list a closing issue, but no completed issue is identified and this is non-critical.
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Inline comments:
Review comments at
@python/aisimulate/tools/support_matrix/fpe_support_matrix.py:
- Line 510: Update the diagnostic matcher so each backend is paired only with
its documented minimum version, rather than allowing either version with either
backend. Add negative tests for the vLLM/sglang cross-pairs to ensure those
diagnostics are not classified as the documented incompatibility.
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📒 Files selected for processing: 9
THIRD_PARTY_NOTICES.mdcrates/core/src/perfmodel/engine/readiness.rscrates/core/src/perfmodel/operators/glm53flash.rsdocs/glm53flash-native-contract.mddocs/perf-model/support-matrix.mdpython/aisimulate/THIRD_PARTY_NOTICES.mdpython/aisimulate/tests/unit/sdk/models/test_glm53flash.pypython/aisimulate/tests/unit/support_matrix/test_fpe_support_matrix.pypython/aisimulate/tools/support_matrix/fpe_support_matrix.py
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- GitHub Check: Simulation Performance (advisory)
- GitHub Check: FPE matrix (rtx_pro_6000_server, sglang)
- GitHub Check: FPE matrix (l40s, vllm)
- GitHub Check: FPE matrix (rtx_pro_6000_server, trtllm)
- GitHub Check: FPE matrix (rtx_pro_6000_server, vllm)
- GitHub Check: FPE matrix (l40s, sglang)
- GitHub Check: FPE matrix (h200_sxm, vllm)
- GitHub Check: FPE matrix (b300_sxm, sglang)
- GitHub Check: FPE matrix (b200_sxm, sglang)
- GitHub Check: FPE matrix (b200_sxm, vllm)
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📚 Code guidelines: 4
python/aisimulate/.claude/rules/rust-core/parity.md — configured
python/aisimulate/.claude/rules/perfmodel-api.md — auto-discovered
AGENTS.md — configured
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Enforce the single-oracle and golden-diff rules in python/aisimulate/.claude/rules/rust-core/parity.md.
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crates/core/src/perfmodel/operators/glm53flash.rscrates/core/src/perfmodel/engine/readiness.rs
Verify upstream provenance, license text, collection and overlay hashes, local modification notices, and generated derivative records remain complete and internally consistent.
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⚙️ CodeRabbit configuration file
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docs/perf-model/support-matrix.mddocs/glm53flash-native-contract.md
Read REVIEW.md before commenting.
⚙️ CodeRabbit configuration file
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THIRD_PARTY_NOTICES.mdpython/aisimulate/tools/support_matrix/fpe_support_matrix.pypython/aisimulate/tests/unit/support_matrix/test_fpe_support_matrix.pydocs/perf-model/support-matrix.mdcrates/core/src/perfmodel/operators/glm53flash.rscrates/core/src/perfmodel/engine/readiness.rsdocs/glm53flash-native-contract.mdpython/aisimulate/THIRD_PARTY_NOTICES.mdpython/aisimulate/tests/unit/sdk/models/test_glm53flash.py
Source excerpt: Any PR that changes what the compiled engine computes (operators, loaders, interpolation, selection rules, engine composition) MUST in the same PR: Keep `test_engine_step_parity.py` / `test_compile_engine_parity.py` green —...
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crates/core/src/perfmodel/operators/glm53flash.rscrates/core/src/perfmodel/engine/readiness.rs
Applicability reference: AGENTS.md: # AGENTS Before changing a performance model, its configuration, or a caller in Rust, Python, CLI, Sweeper, Replay, or Planner, MUST read and follow [`perfmodel-api.md`](python/aisimulat...
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Source excerpt: Keep run logs, investigation notes, and benchmark results out of `docs/`; measured evidence belongs under `benchmarks/evidence/`.
📄 CodeRabbit inference engine (AGENTS.md)
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THIRD_PARTY_NOTICES.mdpython/aisimulate/tools/support_matrix/fpe_support_matrix.pypython/aisimulate/tests/unit/support_matrix/test_fpe_support_matrix.pydocs/perf-model/support-matrix.mdcrates/core/src/perfmodel/operators/glm53flash.rscrates/core/src/perfmodel/engine/readiness.rsdocs/glm53flash-native-contract.mdpython/aisimulate/THIRD_PARTY_NOTICES.mdpython/aisimulate/tests/unit/sdk/models/test_glm53flash.py
Source excerpt: Binary parquet changes require a machine-readable summary of keys, shapes, units, row counts, coverage, and anomalies plus proof that a real consumer reaches the new data.
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THIRD_PARTY_NOTICES.mdpython/aisimulate/tools/support_matrix/fpe_support_matrix.pypython/aisimulate/tests/unit/support_matrix/test_fpe_support_matrix.pydocs/perf-model/support-matrix.mdcrates/core/src/perfmodel/operators/glm53flash.rscrates/core/src/perfmodel/engine/readiness.rsdocs/glm53flash-native-contract.mdpython/aisimulate/THIRD_PARTY_NOTICES.mdpython/aisimulate/tests/unit/sdk/models/test_glm53flash.py
🧠 Learnings: 3
📓 Common learnings
Learnt from: CR
Repo: ai-dynamo/aisimulate PR: 0
File: python/aisimulate/.claude/rules/repo-guide.md:0-0
Timestamp: 2026-10-20T16:51:36.054Z
Learning: Source excerpt:
# Repo Guide (always loaded — everything else loads by path)
## Governed areas
- Performance models and their Rust/Python/CLI/Sweeper/Replay/Planner consumers
→ read [perfmodel-api.md](perfmodel-api.md) before extending or migrating an API.
Learnt from: CR
Repo: ai-dynamo/aisimulate PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-10-20T16:50:41.000Z
Learning: Source excerpt:
# AGENTS
## Performance Model Changes
Before changing a performance model, its configuration, or a caller in Rust,
Python, CLI, Sweeper, Replay, or Planner, MUST read and follow
[`perfmodel-api.md`](python/aisimulate/.claude/rules/perfmodel-api.md).
This includes new features and configuration migrations.
📚 Learning: 2026-10-20T16:50:41.000Z
Learnt from: CR
Repo: ai-dynamo/aisimulate PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-10-20T16:50:41.000Z
Learning: Applies to python/aisimulate/THIRD_PARTY_NOTICES.md : Source excerpt:
# AGENTS
## Required Third-Party Attribution
Before adding code or other content copied, adapted, translated, or
substantially derived from an external project, MUST:
- Add an entry to the root `THIRD_PARTY_NOTICES.md` identifying the derived
files, upstream source and immutable revision, copyright owner, applicable
license, and whether the files were modified. The root notice is canonical;
keep `python/aisimulate/THIRD_PARTY_NOTICES.md` byte-identical so the notice
is included in Python distributions. Run
`python3 scripts/ci/check_packaged_legal_files.py` after either copy changes.
Applied to files:
python/aisimulate/THIRD_PARTY_NOTICES.md
📚 Learning: 2026-10-20T16:50:41.000Z
Learnt from: CR
Repo: ai-dynamo/aisimulate PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-10-20T16:50:41.000Z
Learning: Applies to {THIRD_PARTY_NOTICES.md,python/aisimulate/THIRD_PARTY_NOTICES.md} : Source excerpt:
# AGENTS
## Required Third-Party Attribution
Before adding code or other content copied, adapted, translated, or
substantially derived from an external project, MUST:
- Add an entry to the root `THIRD_PARTY_NOTICES.md` identifying the derived
files, upstream source and immutable revision, copyright owner, applicable
license, and whether the files were modified. The root notice is canonical;
keep `python/aisimulate/THIRD_PARTY_NOTICES.md` byte-identical so the notice
is included in Python distributions. Run
`python3 scripts/ci/check_packaged_legal_files.py` after either copy changes.
Applied to files:
python/aisimulate/THIRD_PARTY_NOTICES.md
🪛 ast-grep (0.45.3)
python/aisimulate/tools/support_matrix/fpe_support_matrix.py
[warning] 515-515: Regex pattern passed to re is built from a non-literal (variable, call, concatenation, or f-string) value. If that value is attacker-controlled it can introduce a malicious pattern with catastrophic backtracking (ReDoS). Use a hardcoded literal pattern, or validate/escape untrusted input with re.escape() and bound the regex complexity before compiling.
Context: re.fullmatch(hopper_kv_rejection, str(item).strip())
Note: [CWE-1333] Inefficient Regular Expression Complexity.
(redos-non-literal-regex-python)
🔀 Multi-repo context ai-dynamo/dynamo, ai-dynamo/aiconfigurator
Linked repositories findings
ai-dynamo/dynamo
- GLM-5.3 recipes use SGLang 0.5.18. [::ai-dynamo/dynamo::recipes/glm-5.3/README.md:27]
- H200 aggregate deployment enables FP8 KV and DSA attention on that image. [::ai-dynamo/dynamo::recipes/glm-5.3/sglang/agg-h200-agentic/deploy.yaml:13-30] [::ai-dynamo/dynamo::recipes/glm-5.3/sglang/agg-h200-agentic/deploy.yaml:67-68]
- H200 disaggregated prefill and decode configurations likewise enable FP8 KV and DSA. [::ai-dynamo/dynamo::recipes/glm-5.3/sglang/disagg-h200-agentic/deploy.yaml:12-28] [::ai-dynamo/dynamo::recipes/glm-5.3/sglang/disagg-h200-agentic/deploy.yaml:48-60] [::ai-dynamo/dynamo::recipes/glm-5.3/sglang/disagg-h200-agentic/deploy.yaml:83-90]
These downstream recipes request the capability admitted by this PR but remain pinned below the new SGLang 0.5.22 minimum.
ai-dynamo/aiconfigurator
- The frozen compatibility model aliases GLM-5.3 to GLM-5.2 and separates BF16,
fp8_block, and NVFP4 model quantization modes. [::ai-dynamo/aiconfigurator::collector/cases/models/GlmMoeDsaForCausalLM_cases.yaml:134-176] - Its sparse GLM collector and tests are explicitly tied to the SGLang 0.5.14 DSA API. [::ai-dynamo/aiconfigurator::tests/unit/collector/test_sglang_glm5_sparse_0514.py:61-66]
This reference contains no corresponding 0.5.22 runtime-gate update or exact-runtime FP8-KV coverage.
🔇 Additional comments: 1
python/aisimulate/tests/unit/sdk/models/test_glm53flash.py: 1
351-351: 🎯 Functional CorrectnessKeep the assertion unchanged.
The provenance config retains
Nonefor an omitted KV request. The native engine may apply FP8 internally, but that does not rewrite the diagnostic request value. The proposed assertion change is not needed.
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Reviewed 3539fee6 with independent checks of upstream release boundaries, FP8 QK/PV arithmetic, and native diagnostic classification. No blocking findings. Locally ran 613 model, support-matrix and numerical-parity tests against this head's CI-built wheel; all passed. Exact-head Hopper FPE artifacts also show the original 96 plans / 328 blocking rows correctly classified as incompatible, without fabricating PASS results.
The non-blocking backend/minimum pairing hardening remains noted in the existing thread. No GPU latency-accuracy or completed nightly-publication claim is implied by this approval.
…amo#574) * fix: enable GLM Hopper FP8 KV on supported runtimes * fix: bind Hopper KV diagnostics to backend minimums
Why and what changed
GLM-5.3-Flash FP8 KV on H100/H200 was rejected for every runtime version. SGLang v0.5.22 contains the CUDA TileLang implementation and vLLM v0.32.0 fixes the SM90 FlashInfer plan dtype, so this restriction also rejected working deployments.
Admit Hopper FP8 KV at those release boundaries, retain the older-runtime rejection, and classify that exact build diagnostic as
FRAMEWORK_INCOMPATIBLE. Price SGLang's newly admitted QK/PV arithmetic using FP8 tensor-core throughput. Document the required TileLang serving flags and the existingAIC_ALLOW_UNLISTED_VERSIONS=1opt-in for analytical evaluation of versions outside the packaged query slots.Review map
crates/core/src/perfmodel/engine/readiness.rs, thenoperators/glm53flash.rsand the support-matrix classifier.Evidence
cargo test -p aisimulate-core glm53 --lib— 37 passed.python/aisimulate/.venv/bin/pytest -c python/aisimulate/pytest.ini python/aisimulate/tests/unit/sdk/models/test_glm53flash.py -q— 144 passed.python/aisimulate/.venv/bin/pytest -c python/aisimulate/pytest.ini python/aisimulate/tests/unit/support_matrix/test_fpe_support_matrix.py python/aisimulate/tests/unit/support_matrix/test_fpe_qualification.py -q— 82 passed.python/aisimulate/.venv/bin/pytest -c python/aisimulate/pytest.ini crates/core/parity_tests/perfmodel/test_engine_step_parity.py crates/core/parity_tests/perfmodel/test_compile_engine_parity.py -q— 389 passed.cargo fmt --all --check,git diff --check, andpython3 scripts/ci/check_packaged_legal_files.pypassed.5d94f69d0d7543950dc133d9926ac6a0eb33452e; Full CI completed with 54 successful jobs and 2 conditional skips.5d94f69d0d7543950dc133d9926ac6a0eb33452e(31 successful jobs). The four H100/H200 SGLang/vLLM reports contain zeroBUILD_FAILED/QUERY_FAILED; all 328 original GLM Hopper old-runtime rejections areFRAMEWORK_INCOMPATIBLE. This verifies FPE qualification, not the complete nightly publication pipeline.3539fee6ab73cd557d882a0cb843e7e46faf8f4f; the backend/minimum pairing finding is addressed in5d94f69d0d7543950dc133d9926ac6a0eb33452ewith two negative regression cases.5d94f69d0d7543950dc133d9926ac6a0eb33452e(independent review of the initial change and follow-up).BUILD_FAILED.Modeling or data provenance
Upstream support: SGLang #42957, merge
9336681310c7a7153c4fbd7c2b9ae62011899014; vLLM #55222, mergec37f86e5721f089a27c8e4358c30e435805fcaab. Immutable source attribution is recorded in both synchronized notices.This adds analytical capability, not new measured performance or accuracy acceptance. Strict SILICON still requires exact-runtime and exact-KV data. SGLang serving requires FP8 E4M3 plus TileLang for both DSA prefill and decode; DCP > 1 and HiSparse remain outside the modeled path. No new native GPU run was performed in this PR.
Tracking