A confidence interval expresses uncertainty around an estimated benchmark time. Criterion reports a configurable interval, defaulting to 95%, with lower and upper bounds around its best estimate. section 6.5
Reading Criterion output
For the u8 benchmark, Criterion reports time: [257.13 ps 261.71 ps 266.79 ps]. The first value is the lower bound, the last is the upper bound, and the middle value is Criterion’s best estimate. section 6.5
Figure 6.4 Anatomy of Criterion’s command-line output
Use the command-line output anatomy to identify the confidence interval’s bounds and central estimate in benchmark results. section 6.5
