hyperfine 命令

常用示例

说明

hyperfine is a command-line benchmarking tool that measures command execution time with statistical analysis. It provides accurate measurements by running commands multiple times and calculating mean, standard deviation, min, max, and relative comparisons. The tool automatically determines the optimal number of runs based on variance, ensuring statistically meaningful results. Warmup runs help account for cache effects and JIT compilation in interpreted languages. When comparing multiple commands, hyperfine shows relative speedup/slowdown ratios. Color-coded output highlights the fastest command. This makes A/B testing of optimizations straightforward. Parameter scanning enables benchmarking across value ranges without writing wrapper scripts. For example, testing thread counts from 1-16 with a single command. Results can be exported to JSON, CSV, or Markdown for further analysis or documentation. The prepare option enables clean-state benchmarks (e.g., clearing caches or rebuilding). The shell option allows testing shell-specific features or running with minimal shell overhead using -N.

参数

-w, --warmup _n_

Run n warmup iterations before timing.

-m, --min-runs _n_

Minimum number of runs (default: 10).

-M, --max-runs _n_

Maximum number of runs.

-r, --runs _n_

Exact number of runs.

-p, --prepare _cmd_

Command to run before each timing run.

-c, --cleanup _cmd_

Command to run after each timing run.

-s, --setup _cmd_

Command to run once before all benchmarks.

-P, --parameter-scan _var start end_

Run benchmark for parameter range.

-L, --parameter-list _var_ _vals_

Run benchmark for comma-separated values.

-S, --shell _shell_

Shell to use (default: system default).

-N

No shell, run command directly.

--ignore-failure

Continue on non-zero exit codes.

--export-json _file_

Export to JSON.

--export-csv _file_

Export to CSV.

--export-markdown _file_

Export to Markdown.

--show-output

Show command output.

--style _type_

Output style: auto, full, basic, nocolor, color, none.