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An 8B model on one H100 stops scaling at high request rates and the GPU is not saturated. Prove the CPU is the bottleneck, then fix it.

Small models make the GPU step so short that host work stops hiding behind it. The answer shows how to prove that with a timeline instead of a hunch, how much throughput a few milliseconds of Python cost, and which fixes help in which order.

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

Small models make the GPU step so short that host work stops hiding behind it. The answer shows how to prove that with a timeline instead of a hunch, how much throughput a few milliseconds of Python cost, and which fixes help in which order.

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Next in this trackMemory on an inference server grows slowly all day until the engine OOMs and restarts. Find the leak.Next in this trackBuild the dashboard you want open before your next inference incident, and say what decision each panel drives.Next in this trackStructured output slowed generation. Is the cause grammar compilation, mask construction, or host scheduling?
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