perf(rocm): fuse Kimi-K3 B1 pre-route projections - #9
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Fuse the routed, shared gate-up, and shared down projections for the exact gfx950 batch-one contract, while preserving the existing path for every unsupported configuration. Assisted-by: OpenAI Codex Signed-off-by: Yanyuan Qin <yanyuan.qin@amd.com>
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Summary
Integrate the exact-BF16 AITER Kimi-K3 batch-one pre-route specialization
behind
VLLM_ROCM_USE_KIMI_K3_PREROUTE_BF16=1.The specialization computes the routed latent activation and shared-expert
output together. The existing MoE runner consumes the precomputed shared
output without repeating gate/up, SiTU, or down-projection work.
This PR depends on JohnQinAMD/aiter-amd#21.
Design
KimiK3PrerouteBf16.create_if_supportedowns construction-time eligibility:AITER on ROCm, FlyDSL on gfx950, latent MoE, TP8, shared experts, SiTU, and no
LoRA. Runtime tensor checks remain in AITER. Every unsupported configuration
uses the existing path.
SharedExperts.use_precomputed_outputis a backend-neutral, one-shot ownershipboundary with per-DBO-microbatch slots, collision detection, and
exception-safe cleanup. Empty slots preserve ordinary shared-expert execution.
No checkpoint parameter is duplicated or re-registered. NVIDIA model code,
kernel dispatch, and runner selection are unchanged.
Performance
Kimi-K3 TP8, batch 1, 8K input / 1K output, no speculative decoding:
The candidate gains 5.53%, removes 0.8596 ms/token, and saves 184 launches per
token.
Accuracy and validation
questions; 5-shot, temperature 0, seed 42, concurrency 1.
dc402c40c86bd8dd863ff3dbbb26e2c6295151cca6a557027729a2e561b70dfc.mypy, SPDX, lazy/forbidden imports, configuration checks, and CUDA API guard.
git diff --checkpassed.This clean replacement drops an unrelated stale latent-tail environment entry
that caused the original branch to conflict with current main. The optimization
diff and measured contract are unchanged.
Disclosure
Developed with assistance from OpenAI Codex. The author reviewed the code,
tests, numerical thresholds, and benchmark evidence.