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KV cache blending technique boosts LLM prefill speed by 3x

A user on Reddit's r/LocalLLaMA subreddit has shared a technique called KV cache blending, which significantly speeds up prompt processing for large language models. This method involves splitting a prompt into smaller chunks, generating separate KV caches for each, and then concatenating them. The user reports a 3x increase in prefill speed, achieving approximately 1.3k tokens per second at a 256k token context length, while maintaining full retrieval capabilities even across split prompt sections. AI

IMPACT This technique could significantly improve inference speeds for LLMs, enabling faster processing of long contexts and potentially reducing operational costs.

RANK_REASON User-developed technique for improving LLM inference performance.

Read on r/LocalLLaMA →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

KV cache blending technique boosts LLM prefill speed by 3x

COVERAGE [1]

  1. r/LocalLLaMA TIER_1 English(EN) · /u/maddie-lovelace ·

    Anyone else tried out KV cache blending?

    <!-- SC_OFF --><div class="md"><p>Idea is simple-ish in abstract: instead of running normal prefill over all of a given prompt, split it into parts - generates caches for part A and part B in isolation, concatenate the result, feed it into decode like normal.</p> <p>I honestly th…