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You upgraded the serving engine with the same flags and throughput fell. Which defaults do you diff first, and how do you prove it?

Same command line, new version, lower throughput. The answer is a method: capture the resolved configuration on both sides, diff the handful of defaults that move every quarter, then pin and bisect.

Updated Oct 2026 · Worked answers on inference mechanisms, with calculations, implementation details, and follow-up questions.

Same command line, new version, lower throughput. The answer is a method: capture the resolved configuration on both sides, diff the handful of defaults that move every quarter, then pin and bisect.

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Next in this trackllama.cpp versus vLLM: what is each engine built for, and when does the CPU or Apple Silicon path actually win?Next in this trackWrite the main loop of a minimal LLM serving engine: request queue, scheduler, model step, sampling and streaming.Next in this trackWhat changed in vLLM's Model Runner V2 compared with the V1 runner, how does the engine decide which one to use, and what falls back?

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