nano-benchmark provides command-line utilities for benchmarking code and related statistical modules.

Two utilities are available:

• nano-watch — provides statistics in a streaming mode continuously running your code, watching memory usage and updating the output.
• nano-bench — runs benchmark tests on your code, calculating statistics and statistical significance, and presenting them in a tabular format.

The utilities are mostly used to measure performance of your code and compare it with other variants. It is geared toward benchmarking and performance tuning of small fast snippets of code, e.g., used in tight loops.

npm install --save nano-benchmark

Both deno and bun are supported.

If you want to run the benchmark in Deno, Bun, etc. you can specify self as the file argument or the --self option. In this case the utility will print out its file name to stdout and exit. It allows running the utility with alternative JavaScript interpreters.

Examples with bash:

$ npx nano-bench benchmark.js
$ bun `npx nano-bench --self` benchmark.js
$ deno run --allow-read --allow-hrtime `npx nano-bench --self` benchmark.js
$ deno run -A `npx nano-bench --self` benchmark.js
$ node `npx nano-bench --self` benchmark.js

Don't forget to specify the appropriate permissions for Deno to run the benchmark scripts: --allow-read (required) and --allow-hrtime (optional but recommended). Or consider using -A or --allow-all to allow all permissions (used it only in safe environments!).

Both utilities are available by name if you installed nano-benchmark globally (npm install -g nano-benchmark). If it is installed as a dependency, you can use utilities by name in the scripts section of your package.json file or from the command line by prefixing them with npx, e.g., npx nano-watch.

Utilities are self-documented — run them with --help flag to learn about arguments.

Both utilities import a module to benchmark using its (default) export. nano-bench assumes that it is an object with functional properties, which should be benchmarked and compared. nano-watch can use the same file format as nano-bench or it can use a single function.

Example of a module for nano-bench called bench-strings-concat.js:

export default {
  strings: n => {
    const a = 'a',
      b = 'b';
    for (let i = 0; i < n;   i) {
      const x = a   '-'   b;
    }
  },
  backticks: n => {
    const a = 'a',
      b = 'b';
    for (let i = 0; i < n;   i) {
      const x = `${a}-${b}`;
    }
  },
  join: n => {
    const a = 'a',
      b = 'b';
    for (let i = 0; i < n;   i) {
      const x = [a, b].join('-');
    }
  }
};

The way to use it:

npx nano-bench bench-strings-concat.js
npx nano-watch bench-strings-concat.js backticks

See wiki for more details.

BSD 3-Clause License

• 1.0.2: Added the --self option.
• 1.0.1: Added "self" argument to utilities so it can be used with Deno, Bun, etc.
• 1.0.0: Initial release.