tail latency

AI infra interview questions tagged tail latency, across every topic.

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Concepts behind "tail latency"

The curriculum that explains the ideas these questions test.

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Designing for Latency SLOsA latency objective is met or missed by the sum of a chain of delays, and the way to design for it is to write the chain down with a number on every link, find the links that dominate at the tail, and attack those. For an LLM request the chain is network, gateway, router, queue, prefill, then the decode loop, and the tail is shaped by queueing and by the size of the batch the request lands in. This page decomposes a 500 ms time-to-first-token budget link by link, derives how queueing turns a comfortable median into a broken p99, and gives the design moves (admission control, chunked prefill, priority lanes, hedging) that hold it.

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