Why LLM Inference Batching Breaks: Prefill vs Decode
This story is from 2026-10-22. It is preserved in the archive; the latest stories are on the live feed.
TL;DR — LLM inference serving treats prefill and decode as one workload, but they have opposite resource profiles — prefill is compute-bound and parallel, decode is memory-bound and sequential. Continuous batching and quantization optimize around this mismatch instead of fixing it. Disaggregating p…
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- 2026-10-22 13:16 · DEV Community — AI
Why LLM Inference Batching Breaks: Prefill vs Decode