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Chapter D · 4 of 4~10 min

Load testing lab

**Spike, soak, breakpoint** — find limits before your launch traffic does.

Reviewed July 2026 · interactive lab

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1Try it yourself

Playground

Load testing lab

Spike, soak, or breakpoint — match the test to the risk.

Black Friday traffic 10× normal for 2 hours

Spike, soak, or breakpoint test?

2Read & reflect

Recap

#What you just did

You matched Black Friday spikes, overnight leaks, and max-concurrency hunts to the right test type.

Teach

#Pattern

spike:   0 → 500 rps in 1m, hold 10m   # autoscale + queue behavior
soak:    50 rps for 8h                 # memory + cost drift
breakpoint: ramp until p95 > SLO or 5xx # find ceiling

Record token usage per test — load tests can burn real budget.

Use it

#When you'd use this

  • Before marketing launches a viral feature
  • Sizing GPU / serverless concurrency for RAG
  • Validating rate limits and circuit breakers under stress

Watch out

#Watch out

Testing against production without throttles can trigger provider bans — use staging or synthetic traffic caps.

Try next

#Try this next

Define one spike scenario for your capstone chat API with success criteria.

3Spark check

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