AI Interview Prep

AI Interview Prep

LLM System Design Interview #6 - When Memory Becomes the Enemy

KV caching solves compute - and creates a VRAM fragmentation nightmare. How PagedAttention turns GPUs into miniature operating systems.

Hao Hoang's avatar
Hao Hoang
Nov 05, 2025
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You’re in an AI Engineer interview at Meta and the interviewer asks:

“We all know KV Caching speeds up token generation. What’s the primary bottleneck this technique creates in a high-throughput production system, and how do you conceptually solve it?”

Don’t say: “It’s an optimization that stops the model from re-computing the Key/Value states for all pre…

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