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Split-KV decoding: how many splits would you use for batch 1 at 128K context on 132 SMs, and how are the partial results merged?

Batch-1 decode at long context gives the GPU eight thread blocks and 132 SMs. The answer counts the waves, picks the split count from a wave-efficiency rule rather than a guess, and derives the merge that makes the result exact.

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

Batch-1 decode at long context gives the GPU eight thread blocks and 132 SMs. The answer counts the waves, picks the split count from a wave-efficiency rule rather than a guess, and derives the merge that makes the result exact.

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