Method run

packages/bench/metabench.ts:150–213

()

class BenchmarkJS extends Metabench {
  runner = "benchmarkjs";
  async run() {
    const suite = new Benchmark.Suite();
    console.log(`  benchmarking ${chalk.white(this.name)} with ${this.runner}`);
    for (const name in this.benchmarks) {
      const fn = this.benchmarks[name];
      suite.add(name, fn);
    }
    suite.on("cycle", (event: Benchmark.Event) => {
      // const target = event.target;
      // console.log(target.name, target.hz, target.stats!.mean);
      console.log(chalk.white.dim(`  → ${String(event.target)}`));
      // print summary
    });
    suite.on("complete", (event: Benchmark.Event) => {
      // print summary
      const suite = event.currentTarget as Benchmark.Suite;

      // for(const benchmark of suite){}
      const results: {
        name: string;
        hz: number;
        mean: number;
        rme: number;
        samples: number;
      }[] = suite.map((benchmark: Benchmark) => ({
        name: benchmark.name,
        hz: benchmark.hz,
        mean: benchmark.stats.mean,
        rme: benchmark.stats.rme,
        samples: benchmark.stats.sample.length,
      }));

      results.sort((a, b) => a.hz - b.hz).reverse();
      const slowest = results[results.length - 1];

      const table = new Table({
        columns: [
          { name: "name", color: "white" },
          { name: "summary", alignment: "left" },
          { name: "ops/sec", color: "cyan" },
          { name: "time/op", color: "magenta" },
          { name: "margin", color: "magenta" },
          { name: "samples", color: "magenta" },
        ],
      });
      for (const result of results) {
        table.addRow({
          name: result.name,
          summary:
            result === slowest ? "slowest" : `${(result.hz / slowest.hz).toFixed(3)}x faster than ${slowest.name}`,
          "ops/sec": `${formatNumber(result.hz)} ops/sec`,
          "time/op": `${formatNumber(1 / result.hz)}s`,
          margin: `±${result.rme.toFixed(2)}%`,
          samples: result.samples,
        });
      }

      const rendered = `  ${table.render().split("\n").join("\n  ")}`;