Problems / LLM serving, easy

Timeouts on long answers

Answers are 800 tokens at 70 tokens a second, about 12 seconds each. The app gives up after 8 seconds.

Free to open. Runs in your browser, no sign-up.

Your goals

Success ≥ 99%.

The traffic

10 requests a second for 30 seconds: 100% request (reads).

The system

What each component does in this design, and what calls it. The simulator mimics each one from these settings.

ComponentIts job hereSettings
Load balancerLoad balancerTraffic enters here.Calls AI app.Layer 4 balancers route by IP and port; layer 7 balancers read HTTP and can route by path or header.–
AI appApp serviceLoad balancer forwards to it.Calls Model.Little's law: throughput ≈ concurrency ÷ latency. 200 slots at 50 ms serve about 4,000 req/s.3 replicas × 500 slots · timeout 8.0 s
ModelLLM endpointAI app calls it.Latency has two parts: time to the first token, then a steady stream of tokens per second.400 streams

Hints

Try it first. Open one hint at a time if you get stuck.

Hint 1

Compare the timeout with a typical answer time.

Hint 2

Time to first token is not the whole answer.

One way to solve it

Raise the timeout above the full answer time (or stream to the client).

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