Benchmarks

Benchmarks measure how fast code runs and how much it allocates. The testing package runs them with the same go test tooling you already use for unit tests, so the workflow lives next to your tests instead of in a separate harness. This chapter covers the BenchmarkXxx function shape, the b.N loop and timer controls, the -bench, -benchtime, and -benchmem flags, and the common traps that produce misleading numbers.