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How does an engine batch requests for different LoRA adapters in one forward pass, and what do Punica-style shrink and expand kernels do?

Eight tenants, eight adapters, one base model and one batch. The answer explains why the extra cost scales with distinct adapters rather than requests, and which default serializes them.

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

Eight tenants, eight adapters, one base model and one batch. The answer explains why the extra cost scales with distinct adapters rather than requests, and which default serializes them.

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