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benchmark/module/module-loader-circular.js

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+'use strict';
+const fs = require('fs');
+const path = require('path');
+const common = require('../common.js');
+
+const tmpdir = require('../../test/common/tmpdir');
+const benchmarkDirectory = tmpdir.resolve('benchmark-module-circular');
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+});
+
+function main({ n }) {
+  tmpdir.refresh();
+
+  const aDotJS = path.join(benchmarkDirectory, 'a.js');
+  const bDotJS = path.join(benchmarkDirectory, 'b.js');
+
+  fs.mkdirSync(benchmarkDirectory);
+  fs.writeFileSync(aDotJS, 'require("./b.js");');
+  fs.writeFileSync(bDotJS, 'require("./a.js");');
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    require(aDotJS);
+    require(bDotJS);
+    delete require.cache[aDotJS];
+    delete require.cache[bDotJS];
+  }
+  bench.end(n);
+
+  tmpdir.refresh();
+}

benchmark/module/module-loader-deep.js

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+'use strict';
+const fs = require('fs');
+const common = require('../common.js');
+
+const tmpdir = require('../../test/common/tmpdir');
+const benchmarkDirectory = tmpdir.resolve('nodejs-benchmark-module');
+
+const bench = common.createBenchmark(main, {
+  ext: ['', '.js'],
+  files: [1e3],
+  cache: ['true', 'false'],
+});
+
+function main({ ext, cache, files }) {
+  tmpdir.refresh();
+  fs.mkdirSync(benchmarkDirectory);
+  fs.writeFileSync(
+    `${benchmarkDirectory}/a.js`,
+    'module.exports = {};',
+  );
+  for (let i = 0; i <= files; i++) {
+    fs.mkdirSync(`${benchmarkDirectory}/${i}`);
+    fs.writeFileSync(
+      `${benchmarkDirectory}/${i}/package.json`,
+      '{"main": "index.js"}',
+    );
+    fs.writeFileSync(
+      `${benchmarkDirectory}/${i}/index.js`,
+      `require('../a${ext}');`,
+    );
+  }
+
+  measureDir(cache === 'true', files);
+
+  tmpdir.refresh();
+}
+
+function measureDir(cache, files) {
+  if (cache) {
+    for (let i = 0; i <= files; i++) {
+      require(`${benchmarkDirectory}/${i}`);
+    }
+  }
+  bench.start();
+  for (let i = 0; i <= files; i++) {
+    require(`${benchmarkDirectory}/${i}`);
+  }
+  bench.end(files);
+}

benchmark/module/module-loader.js

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+'use strict';
+const fs = require('fs');
+const path = require('path');
+const { builtinModules } = require('module');
+const common = require('../common.js');
+
+const tmpdir = require('../../test/common/tmpdir');
+let benchmarkDirectory = tmpdir.resolve('nodejs-benchmark-module');
+
+// Filter all irregular modules.
+const otherModules = builtinModules.filter((name) => !/\/|^_|^sys/.test(name));
+
+const bench = common.createBenchmark(main, {
+  name: ['', '/', '/index.js'],
+  dir: ['rel', 'abs'],
+  files: [5e2],
+  n: [1, 1e3],
+  cache: ['true', 'false'],
+}, { flags: '--no-warnings' });
+
+function main({ n, name, cache, files, dir }) {
+  tmpdir.refresh();
+  fs.mkdirSync(benchmarkDirectory);
+  for (let i = 0; i <= files; i++) {
+    fs.mkdirSync(`${benchmarkDirectory}${i}`);
+    fs.writeFileSync(
+      `${benchmarkDirectory}${i}/package.json`,
+      '{"main": "index.js"}',
+    );
+    fs.writeFileSync(
+      `${benchmarkDirectory}${i}/index.js`,
+      'module.exports = "";',
+    );
+  }
+
+  if (dir === 'rel')
+    benchmarkDirectory = path.relative(__dirname, benchmarkDirectory);
+
+  measureDir(n, cache === 'true', files, name);
+
+  tmpdir.refresh();
+}
+
+function measureDir(n, cache, files, name) {
+  if (cache) {
+    for (let i = 0; i <= files; i++) {
+      require(`${benchmarkDirectory}${i}${name}`);
+    }
+  }
+  bench.start();
+  for (let i = 0; i <= files; i++) {
+    for (let j = 0; j < n; j++)
+      require(`${benchmarkDirectory}${i}${name}`);
+    // Pretend mixed input (otherwise the results are less representative due to
+    // highly specialized code).
+    require(otherModules[i % otherModules.length]);
+  }
+  bench.end(n * files);
+}

benchmark/module/module-require.js

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+'use strict';
+
+const fs = require('fs');
+const common = require('../common.js');
+const tmpdir = require('../../test/common/tmpdir');
+const benchmarkDirectory = tmpdir.resolve('nodejs-benchmark-module');
+
+const bench = common.createBenchmark(main, {
+  type: ['.js', '.json', 'dir'],
+  n: [1e4],
+});
+
+function main({ type, n }) {
+  tmpdir.refresh();
+  createEntryPoint(n);
+
+  switch (type) {
+    case '.js':
+      measureJSFile(n);
+      break;
+    case '.json':
+      measureJSONFile(n);
+      break;
+    case 'dir':
+      measureDir(n);
+  }
+
+  tmpdir.refresh();
+}
+
+function measureJSFile(n) {
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    require(`${benchmarkDirectory}/${i}`);
+  }
+  bench.end(n);
+}
+
+function measureJSONFile(n) {
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    require(`${benchmarkDirectory}/json_${i}.json`);
+  }
+  bench.end(n);
+}
+
+function measureDir(n) {
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    require(`${benchmarkDirectory}${i}`);
+  }
+  bench.end(n);
+}
+
+function createEntryPoint(n) {
+  fs.mkdirSync(benchmarkDirectory);
+
+  const JSFileContent = 'module.exports = [];';
+  const JSONFileContent = '[]';
+
+  for (let i = 0; i < n; i++) {
+    // JS file.
+    fs.writeFileSync(`${benchmarkDirectory}/${i}.js`, JSFileContent);
+
+    // JSON file.
+    fs.writeFileSync(`${benchmarkDirectory}/json_${i}.json`, JSONFileContent);
+
+    // Dir.
+    fs.mkdirSync(`${benchmarkDirectory}${i}`);
+    fs.writeFileSync(
+      `${benchmarkDirectory}${i}/package.json`,
+      '{"main": "index.js"}',
+    );
+    fs.writeFileSync(
+      `${benchmarkDirectory}${i}/index.js`,
+      JSFileContent,
+    );
+  }
+}