BAC-L2-SUB-111Substrate / Polkadot SDK
Benchmarking and weights
A call whose cost is underestimated is a denial-of-service attack you priced yourself. Measure, do not estimate.
- Level
- L2 — Appchain developer
- Duration
- 4 h
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Write a benchmark representing a call's worst case
- 02Generate measured weights and wire them into the runtime
- 03Explain the link between weight, fees and block capacity
Guided lab
Benchmark the pallet's calls and replace every placeholder weight with a measured value.
Independent lab
Compare weights obtained on two machines of differing power and draw an operational conclusion.
Security angle
Saturate a block with an underpriced call, then show by measurement that the fix closes the attack.
Assessment
Measured weights wired into the runtime, with the benchmark log attached.