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@@ -943,3 +943,17 @@ r27 watch; aiden 159 as the community reference).
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- **Eager A/B (our r18 2x lane + --enforce-eager): 159 vs 158** — the eager
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quality rumor does not hold on this stack (+1 = noise); perf at parity
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(tg c1 27.1 vs 24.5, TTFT 1.17 vs 1.24 s). Graphs remain the default.
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+
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+## Rust frontend (vllm-frontend-rs) — evaluated, deferred (2026-09-07)
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+
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+The r27 tree ships the Rust OpenAI frontend (axum, ZMQ bridge; `vllm-rs`
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+binary is already in our r27 image, built with the wheel; toggle
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+`VLLM_USE_RUST_FRONTEND=1`). Smoke test (dgx5, Qwen3.8-27B, 1 node):
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+fronted boots but fails `engine input registration timed out after 600s`
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+— the Rust client's fixed ready_timeout is shorter than our GB10 boots
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+(NAS weights + JIT + cudagraphs = 10–40 min). Verdict (operator): not
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+pursuing — the fork stays selective about upstream imports and the
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+frontend is upstream-experimental (not feature-complete; parser parity
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+for glm45/glm47 tool/reasoning unverified). Revisit only if upstream
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+matures it (or if per-request CPU overhead ever becomes a bottleneck in
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+our benches).
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