node/benchmark/run.js

'use strict';

const path = require('path');
const fork = require('child_process').fork;
const CLI = require('./_cli.js');

const cli = CLI(`usage: ./node run.js [options] [--] <category> ...
  Run each benchmark in the <category> directory a single time, more than one
  <categoty> directory can be specified.

  --filter pattern          string to filter benchmark scripts
  --set    variable=value   set benchmark variable (can be repeated)
`, {
  arrayArgs: ['set']
});
const benchmarks = cli.benchmarks();

if (benchmarks.length === 0) {
  console.error('no benchmarks found');
  process.exit(1);
}

(function recursive(i) {
  const filename = benchmarks[i];
  const child = fork(path.resolve(__dirname, filename), cli.optional.set);

  console.log();
  console.log(filename);

  child.on('message', function(data) {
    // Construct configuration string, " A=a, B=b, ..."
    let conf = '';
    for (const key of Object.keys(data.conf)) {
      conf += ' ' + key + '=' + JSON.stringify(data.conf[key]);
    }

    console.log(`${data.name}${conf}: ${data.rate}`);
  });

  child.once('close', function(code) {
    if (code) {
      process.exit(code);
      return;
    }

    // If there are more benchmarks execute the next
    if (i + 1 < benchmarks.length) {
      recursive(i + 1);
    }
  });
})(0);