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What does SGLang's overlap scheduler hide, how does it build the next batch before the current tokens exist, and what does it cost?

The GPU finishes a decode step and waits while Python appends tokens, checks stop strings and plans the next batch. The answer shows how the loop reorders that work, where the placeholder tokens live, and the request that pays for it.

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

The GPU finishes a decode step and waits while Python appends tokens, checks stop strings and plans the next batch. The answer shows how the loop reorders that work, where the placeholder tokens live, and the request that pays for it.

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