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benchmark/fs/bench-accessSync.js

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+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const tmpfile = tmpdir.resolve(`.existing-file-${process.pid}`);
+fs.writeFileSync(tmpfile, 'this-is-for-a-benchmark', 'utf8');
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing', 'non-flat-existing'],
+  method: ['access', 'accessSync'],
+  n: [1e5],
+});
+
+function runBench(n, path) {
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.accessSync(path);
+    } catch {
+      // do nothing
+    }
+  }
+}
+
+function runAsyncBench(n, path) {
+  (function r(cntr, path) {
+    if (cntr-- <= 0)
+      return bench.end(n);
+    fs.access(path, () => {
+      r(cntr, path);
+    });
+  })(n, path);
+}
+
+function main({ n, type, method }) {
+  let path;
+
+  switch (type) {
+    case 'existing':
+      path = __filename;
+      break;
+    case 'non-flat-existing':
+      path = tmpfile;
+      break;
+    case 'non-existing':
+      path = tmpdir.resolve(`.non-existing-file-${process.pid}`);
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  if (method === 'access') {
+    // Warmup the filesystem - it doesn't need to use the async method
+    runBench(n, path);
+
+    bench.start();
+    runAsyncBench(n, path);
+  } else {
+    // warmup
+    runBench(n, path);
+
+    bench.start();
+    runBench(n, path);
+    bench.end(n);
+  }
+}

benchmark/fs/bench-chmodSync.js

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+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'existing': {
+      for (let i = 0; i < n; i++) {
+        fs.writeFileSync(tmpdir.resolve(`chmodsync-bench-file-${i}`), 'bench');
+      }
+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.chmodSync(tmpdir.resolve(`chmodsync-bench-file-${i}`), 0o666);
+      }
+      bench.end(n);
+      break;
+    }
+    case 'non-existing':
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.chmodSync(tmpdir.resolve(`chmod-non-existing-file-${i}`), 0o666);
+        } catch {
+          // do nothing
+        }
+      }
+      bench.end(n);
+      break;
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-chownSync.js

@@ -0,0 +1,54 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+if (process.platform === 'win32') {
+  console.log('Skipping: Windows does not have `getuid` or `getgid`');
+  process.exit(0);
+}
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  method: ['chownSync', 'lchownSync'],
+  n: [1e4],
+});
+
+function main({ n, type, method }) {
+  const uid = process.getuid();
+  const gid = process.getgid();
+  const fsMethod = fs[method];
+
+  switch (type) {
+    case 'existing': {
+      tmpdir.refresh();
+      const tmpfile = tmpdir.resolve(`.existing-file-${process.pid}`);
+      fs.writeFileSync(tmpfile, 'this-is-for-a-benchmark', 'utf8');
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fsMethod(tmpfile, uid, gid);
+      }
+      bench.end(n);
+      break;
+    }
+    case 'non-existing': {
+      const path = tmpdir.resolve(`.non-existing-file-${Date.now()}`);
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs[method](path, uid, gid);
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-copyFileSync.js

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+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['invalid', 'valid'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  tmpdir.refresh();
+  const dest = tmpdir.resolve(`copy-file-bench-${process.pid}`);
+  let path;
+
+  switch (type) {
+    case 'invalid':
+      path = tmpdir.resolve(`.existing-file-${process.pid}`);
+      break;
+    case 'valid':
+      path = __filename;
+      break;
+    default:
+      throw new Error('Invalid type');
+  }
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.copyFileSync(path, dest);
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+}

benchmark/fs/bench-cpSync.js

@@ -0,0 +1,56 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+const tmpdir = require('../../test/common/tmpdir');
+
+const bench = common.createBenchmark(main, {
+  n: [1, 100, 10_000],
+  dereference: ['true', 'false'],
+  force: ['true', 'false'],
+});
+
+function prepareTestDirectory() {
+  const testDir = tmpdir.resolve(`test-cp-${process.pid}`);
+  fs.mkdirSync(testDir, { recursive: true });
+
+  fs.writeFileSync(path.join(testDir, 'source.txt'), 'test content');
+
+  fs.symlinkSync(
+    path.join(testDir, 'source.txt'),
+    path.join(testDir, 'link.txt'),
+  );
+
+  return testDir;
+}
+
+function main({ n, dereference, force }) {
+  tmpdir.refresh();
+
+  const src = prepareTestDirectory();
+  const dest = tmpdir.resolve(`${process.pid}/subdir/cp-bench-${process.pid}`);
+
+  const options = {
+    recursive: true,
+    dereference: dereference === 'true',
+    force: force === 'true',
+  };
+
+  if (options.force) {
+    fs.cpSync(src, dest, { recursive: true });
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    if (options.force) {
+      fs.cpSync(src, dest, options);
+    } else {
+      const uniqueDest = tmpdir.resolve(
+        `${process.pid}/subdir/cp-bench-${process.pid}-${i}`,
+      );
+      fs.cpSync(src, uniqueDest, options);
+    }
+  }
+  bench.end(n);
+}

benchmark/fs/bench-existsSync.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const tmpfile = tmpdir.resolve(`.existing-file-${process.pid}`);
+fs.writeFileSync(tmpfile, 'this-is-for-a-benchmark', 'utf8');
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing', 'non-flat-existing'],
+  n: [1e6],
+});
+
+function main({ n, type }) {
+  let path;
+
+  switch (type) {
+    case 'existing':
+      path = __filename;
+      break;
+    case 'non-flat-existing':
+      path = tmpfile;
+      break;
+    case 'non-existing':
+      path = tmpdir.resolve(`.non-existing-file-${process.pid}`);
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    fs.existsSync(path);
+  }
+  bench.end(n);
+}

benchmark/fs/bench-fchmodSync.js

@@ -0,0 +1,60 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  let files;
+
+  switch (type) {
+    case 'existing':
+      files = [];
+
+      // Populate tmpdir with mock files
+      for (let i = 0; i < n; i++) {
+        const path = tmpdir.resolve(`fchmodsync-bench-file-${i}`);
+        fs.writeFileSync(path, 'bench');
+        files.push(path);
+      }
+      break;
+    case 'non-existing':
+      files = new Array(n).fill(tmpdir.resolve(`.non-existing-file-${Date.now()}`));
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  const fds = files.map((x) => {
+    // Try to open, if not return likely invalid fd (1 << 30)
+    try {
+      return fs.openSync(x, 'r');
+    } catch {
+      return 1 << 30;
+    }
+  });
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.fchmodSync(fds[i], 0o666);
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+
+  for (const x of fds) {
+    try {
+      fs.closeSync(x);
+    } catch {
+      // do nothing
+    }
+  }
+}

benchmark/fs/bench-fsyncSync.js

@@ -0,0 +1,42 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const tmpfile = tmpdir.resolve(`.existing-file-${process.pid}`);
+fs.writeFileSync(tmpfile, 'this-is-for-a-benchmark', 'utf8');
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  let fd;
+
+  switch (type) {
+    case 'existing':
+      fd = fs.openSync(tmpfile, 'r', 0o666);
+      break;
+    case 'non-existing':
+      fd = 1 << 30;
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.fsyncSync(fd);
+    } catch {
+      // do nothing
+    }
+  }
+
+  bench.end(n);
+
+  if (type === 'existing') fs.closeSync(fd);
+}

benchmark/fs/bench-ftruncateSync.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const path = tmpdir.resolve(`new-file-${process.pid}`);
+fs.appendFileSync(path, 'Some content.');
+
+const bench = common.createBenchmark(main, {
+  type: ['invalid', 'valid'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  let fd;
+
+  switch (type) {
+    case 'invalid':
+      fd = 1 << 30;
+      break;
+    case 'valid':
+      fd = fs.openSync(path, 'r+');
+      break;
+    default:
+      throw new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.ftruncateSync(fd, 4);
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+  if (type === 'valid') fs.closeSync(fd);
+}

benchmark/fs/bench-glob.js

@@ -0,0 +1,59 @@
+'use strict';
+
+const common = require('../common');
+const {
+  glob,
+  globSync,
+  promises: { glob: globAsync },
+} = require('fs');
+const path = require('path');
+const assert = require('node:assert');
+
+const benchmarkDirectory = path.resolve(__dirname, '..', '..');
+
+const configs = {
+  n: [1e3],
+  dir: ['lib'],
+  pattern: ['**/*', '*.js', '**/**.js'],
+  mode: ['sync', 'promise', 'callback'],
+  recursive: ['true', 'false'],
+};
+
+const bench = common.createBenchmark(main, configs);
+
+async function main(config) {
+  const fullPath = path.resolve(benchmarkDirectory, config.dir);
+  const { pattern, recursive, mode } = config;
+  const options = { cwd: fullPath, recursive };
+  const callback = (resolve, reject) => {
+    glob(pattern, options, (err, matches) => {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(matches);
+      }
+    });
+  };
+
+  let noDead;
+  bench.start();
+
+  for (let i = 0; i < config.n; i++) {
+    switch (mode) {
+      case 'sync':
+        noDead = globSync(pattern, options);
+        break;
+      case 'promise':
+        noDead = await globAsync(pattern, options);
+        break;
+      case 'callback':
+        noDead = await new Promise(callback);
+        break;
+      default:
+        throw new Error(`Unknown mode: ${mode}`);
+    }
+  }
+
+  bench.end(config.n);
+  assert.ok(noDead);
+}

benchmark/fs/bench-linkSync.js

@@ -0,0 +1,50 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+tmpdir.refresh();
+const tmpfile = tmpdir.resolve(`.bench-file-data-${Date.now()}`);
+fs.writeFileSync(tmpfile, 'bench-file', 'utf-8');
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'valid': {
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.linkSync(tmpfile, tmpdir.resolve(`.valid-${i}`), 'file');
+      }
+      bench.end(n);
+
+      break;
+    }
+
+    case 'invalid': {
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.linkSync(
+            tmpdir.resolve(`.non-existing-file-for-linkSync-${i}`),
+            __filename,
+            'file',
+          );
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-mkdirSync.js

@@ -0,0 +1,44 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  recursive: ['true', 'false'],
+  n: [1e3],
+});
+
+function main({ n, type, recursive }) {
+  recursive = recursive === 'true';
+  let files;
+
+  switch (type) {
+    case 'non-existing':
+      files = [];
+
+      // Populate tmpdir with target dirs
+      for (let i = 0; i < n; i++) {
+        const path = tmpdir.resolve(recursive ? `rmdirsync-bench-dir-${process.pid}-${i}/a/b/c` : `rmdirsync-bench-dir-${process.pid}-${i}`);
+        files.push(path);
+      }
+      break;
+    case 'existing':
+      files = new Array(n).fill(__dirname);
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.mkdirSync(files[i], { recursive });
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+}

benchmark/fs/bench-mkdirp.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+let dirc = 0;
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+});
+
+function main({ n }) {
+  bench.start();
+  (function r(cntr) {
+    if (cntr-- <= 0)
+      return bench.end(n);
+    const pathname = `${tmpdir.path}/${++dirc}/${++dirc}/${++dirc}/${++dirc}`;
+    fs.mkdir(pathname, { recursive: true }, (err) => {
+      r(cntr);
+    });
+  }(n));
+}

benchmark/fs/bench-mkdtempSync.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+const bench = common.createBenchmark(main, {
+  type: ['valid-string', 'valid-buffer', 'invalid'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  tmpdir.refresh();
+  const options = { encoding: 'utf8' };
+  let prefix;
+  let out = true;
+
+  switch (type) {
+    case 'valid-string':
+      prefix = tmpdir.resolve(`${Date.now()}`);
+      break;
+    case 'valid-buffer':
+      prefix = Buffer.from(tmpdir.resolve(`${Date.now()}`));
+      break;
+    case 'invalid':
+      prefix = tmpdir.resolve('non-existent', 'foo', 'bar');
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      out = fs.mkdtempSync(prefix, options);
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+  assert.ok(out);
+}

benchmark/fs/bench-openSync.js

@@ -0,0 +1,44 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e5],
+});
+
+function runBench({ n, path }) {
+  for (let i = 0; i < n; i++) {
+    try {
+      const fd = fs.openSync(path, 'r', 0o666);
+      fs.closeSync(fd);
+    } catch {
+      // do nothing
+    }
+  }
+}
+
+
+function main({ n, type }) {
+  let path;
+
+  switch (type) {
+    case 'existing':
+      path = __filename;
+      break;
+    case 'non-existing':
+      path = tmpdir.resolve(`.non-existing-file-${process.pid}`);
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  runBench({ n, path });
+
+  bench.start();
+  runBench({ n, path });
+  bench.end(n);
+}

benchmark/fs/bench-opendir.js

@@ -0,0 +1,53 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+
+const bench = common.createBenchmark(main, {
+  n: [100],
+  dir: [ 'lib', 'test/parallel'],
+  mode: [ 'async', 'sync', 'callback' ],
+  bufferSize: [ 4, 32, 1024 ],
+});
+
+async function main({ n, dir, mode, bufferSize }) {
+  const fullPath = path.resolve(__dirname, '../../', dir);
+
+  bench.start();
+
+  let counter = 0;
+  for (let i = 0; i < n; i++) {
+    if (mode === 'async') {
+      const dir = await fs.promises.opendir(fullPath, { bufferSize });
+      // eslint-disable-next-line no-unused-vars
+      for await (const entry of dir)
+        counter++;
+    } else if (mode === 'callback') {
+      const dir = await fs.promises.opendir(fullPath, { bufferSize });
+      await new Promise((resolve, reject) => {
+        function read() {
+          dir.read((err, entry) => {
+            if (err) {
+              reject(err);
+            } else if (entry === null) {
+              resolve(dir.close());
+            } else {
+              counter++;
+              read();
+            }
+          });
+        }
+
+        read();
+      });
+    } else {
+      const dir = fs.opendirSync(fullPath, { bufferSize });
+      while (dir.readSync() !== null)
+        counter++;
+      dir.closeSync();
+    }
+  }
+
+  bench.end(counter);
+}

benchmark/fs/bench-opendirSync.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const testFiles = fs.readdirSync('test', { withFileTypes: true })
+  .filter((f) => f.isDirectory())
+  .map((f) => path.join(f.parentPath, f.name));
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  let files;
+
+  switch (type) {
+    case 'existing':
+      files = testFiles;
+      break;
+    case 'non-existing':
+      files = [tmpdir.resolve(`.non-existing-file-${Date.now()}`)];
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    for (let j = 0; j < files.length; j++) {
+      try {
+        const dir = fs.opendirSync(files[j]);
+        dir.closeSync();
+      } catch {
+        // do nothing
+      }
+    }
+  }
+  bench.end(n);
+}

benchmark/fs/bench-readSync.js

@@ -0,0 +1,57 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bufferSize = 1024;
+const sectorSize = 512;
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  let fd;
+
+  const tmpfile = { name: tmpdir.resolve(`.existing-file-${process.pid}`),
+                    len: bufferSize * n };
+
+
+  tmpfile.contents = Buffer.allocUnsafe(tmpfile.len);
+
+  for (let offset = 0; offset < tmpfile.len; offset += sectorSize) {
+    const fillByte = 256 * Math.random();
+    const nBytesToFill = Math.min(sectorSize, tmpfile.len - offset);
+    tmpfile.contents.fill(fillByte, offset, offset + nBytesToFill);
+  }
+
+  fs.writeFileSync(tmpfile.name, tmpfile.contents);
+
+  switch (type) {
+    case 'existing':
+      fd = fs.openSync(tmpfile.name, 'r', 0o666);
+      break;
+    case 'non-existing':
+      fd = 1 << 30;
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  const buffer = Buffer.alloc(bufferSize);
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.readSync(fd, buffer);
+    } catch {
+      // Continue regardless of error.
+    }
+  }
+  bench.end(n);
+
+  if (type === 'existing') fs.closeSync(fd);
+}

benchmark/fs/bench-readdir.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+
+const bench = common.createBenchmark(main, {
+  n: [10],
+  dir: [ 'lib', 'test/parallel'],
+  withFileTypes: ['true', 'false'],
+});
+
+function main({ n, dir, withFileTypes }) {
+  withFileTypes = withFileTypes === 'true';
+  const fullPath = path.resolve(__dirname, '../../', dir);
+  bench.start();
+  (function r(cntr) {
+    if (cntr-- <= 0)
+      return bench.end(n);
+    fs.readdir(fullPath, { withFileTypes }, () => {
+      r(cntr);
+    });
+  }(n));
+}

benchmark/fs/bench-readdirSync.js

@@ -0,0 +1,22 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+
+const bench = common.createBenchmark(main, {
+  n: [10],
+  dir: [ 'lib', 'test/parallel'],
+  withFileTypes: ['true', 'false'],
+});
+
+
+function main({ n, dir, withFileTypes }) {
+  withFileTypes = withFileTypes === 'true';
+  const fullPath = path.resolve(__dirname, '../../', dir);
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    fs.readdirSync(fullPath, { withFileTypes });
+  }
+  bench.end(n);
+}

benchmark/fs/bench-readlinkSync.js

@@ -0,0 +1,54 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+if (process.platform === 'win32') {
+  console.log('Skipping: Windows does not play well with `symlinkSync`');
+  process.exit(0);
+}
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'valid': {
+      tmpdir.refresh();
+      const tmpfile = tmpdir.resolve(`.readlink-file-${process.pid}`);
+      fs.writeFileSync(tmpfile, 'data', 'utf8');
+      let returnValue;
+      for (let i = 0; i < n; i++) {
+        fs.symlinkSync(tmpfile, tmpdir.resolve(`.readlink-sync-${i}`), 'file');
+      }
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        returnValue = fs.readlinkSync(tmpdir.resolve(`.readlink-sync-${i}`), { encoding: 'utf8' });
+      }
+      bench.end(n);
+      assert.ok(returnValue);
+      break;
+    }
+
+    case 'invalid': {
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.readlinkSync(tmpdir.resolve('.non-existing-file-for-readlinkSync'));
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-readvSync.js

@@ -0,0 +1,58 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const exptectedBuff = Buffer.from('Benchmark Data');
+const expectedLength = exptectedBuff.length;
+
+const bufferArr = [Buffer.alloc(expectedLength)];
+
+const filename = tmpdir.resolve('readv_sync.txt');
+fs.writeFileSync(filename, exptectedBuff);
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e5],
+});
+
+function main({ n, type }) {
+  let fd;
+  let result;
+
+  switch (type) {
+    case 'valid':
+      fd = fs.openSync(filename, 'r');
+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        result = fs.readvSync(fd, bufferArr, 0);
+      }
+
+      bench.end(n);
+      assert.strictEqual(result, expectedLength);
+      fs.closeSync(fd);
+      break;
+    case 'invalid': {
+      fd = 1 << 30;
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          result = fs.readvSync(fd, bufferArr, 0);
+        } catch {
+          hasError = true;
+        }
+      }
+
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    default:
+      throw new Error('Invalid type');
+  }
+}

benchmark/fs/bench-realpath.js

@@ -0,0 +1,41 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+const resolved_path = path.resolve(__dirname, '../../lib/');
+const relative_path = path.relative(__dirname, '../../lib/');
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+  pathType: ['relative', 'resolved'],
+});
+
+
+function main({ n, pathType }) {
+  bench.start();
+  if (pathType === 'relative')
+    relativePath(n);
+  else
+    resolvedPath(n);
+}
+
+function relativePath(n) {
+  (function r(cntr) {
+    if (cntr-- <= 0)
+      return bench.end(n);
+    fs.realpath(relative_path, () => {
+      r(cntr);
+    });
+  }(n));
+}
+
+function resolvedPath(n) {
+  (function r(cntr) {
+    if (cntr-- <= 0)
+      return bench.end(n);
+    fs.realpath(resolved_path, () => {
+      r(cntr);
+    });
+  }(n));
+}

benchmark/fs/bench-realpathSync.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+
+process.chdir(__dirname);
+const resolved_path = path.resolve(__dirname, '../../lib/');
+const relative_path = path.relative(__dirname, '../../lib/');
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+  pathType: ['relative', 'resolved'],
+});
+
+
+function main({ n, pathType }) {
+  const path = pathType === 'relative' ? relative_path : resolved_path;
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    fs.realpathSync(path);
+  }
+  bench.end(n);
+}

benchmark/fs/bench-renameSync.js

@@ -0,0 +1,49 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+const bench = common.createBenchmark(main, {
+  type: ['invalid', 'valid'],
+  n: [2e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'invalid': {
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.renameSync(tmpdir.resolve(`.non-existing-file-${i}`), tmpdir.resolve(`.new-file-${i}`));
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    case 'valid': {
+      tmpdir.refresh();
+      for (let i = 0; i < n; i++) {
+        fs.writeFileSync(tmpdir.resolve(`.existing-file-${i}`), 'bench', 'utf8');
+      }
+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.renameSync(
+          tmpdir.resolve(`.existing-file-${i}`),
+          tmpdir.resolve(`.new-existing-file-${i}`),
+        );
+      }
+
+      bench.end(n);
+      break;
+    }
+    default:
+      throw new Error('Invalid type');
+  }
+}

benchmark/fs/bench-rmdirSync.js

@@ -0,0 +1,42 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'existing': {
+      for (let i = 0; i < n; i++) {
+        fs.mkdirSync(tmpdir.resolve(`rmdirsync-bench-dir-${i}`));
+      }
+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.rmdirSync(tmpdir.resolve(`rmdirsync-bench-dir-${i}`));
+      }
+      bench.end(n);
+      break;
+    }
+    case 'non-existing': {
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.rmdirSync(tmpdir.resolve(`.non-existent-folder-${i}`));
+        } catch {
+          // do nothing
+        }
+      }
+      bench.end(n);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-stat-promise.js

@@ -0,0 +1,28 @@
+'use strict';
+
+const common = require('../common');
+const fsPromises = require('fs').promises;
+
+const bench = common.createBenchmark(main, {
+  n: [20e4],
+  statType: ['fstat', 'lstat', 'stat'],
+});
+
+async function run(n, statType) {
+  const handleMode = statType === 'fstat';
+  const arg = handleMode ? await fsPromises.open(__filename, 'r') : __filename;
+  let remaining = n;
+  bench.start();
+  while (remaining-- > 0)
+    await (handleMode ? arg.stat() : fsPromises[statType](arg));
+  bench.end(n);
+
+  if (typeof arg.close === 'function')
+    await arg.close();
+}
+
+function main(conf) {
+  const n = conf.n >>> 0;
+  const statType = conf.statType;
+  run(n, statType).catch(console.log);
+}

benchmark/fs/bench-stat.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+
+const bench = common.createBenchmark(main, {
+  n: [20e4],
+  statType: ['fstat', 'lstat', 'stat'],
+});
+
+
+function main({ n, statType }) {
+  let arg;
+  if (statType === 'fstat')
+    arg = fs.openSync(__filename, 'r');
+  else
+    arg = __filename;
+
+  bench.start();
+  (function r(cntr, fn) {
+    if (cntr-- <= 0) {
+      bench.end(n);
+      if (statType === 'fstat')
+        fs.closeSync(arg);
+      return;
+    }
+    fn(arg, () => {
+      r(cntr, fn);
+    });
+  }(n, fs[statType]));
+}

benchmark/fs/bench-statSync-failure.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const path = require('path');
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+  statSyncType: ['fstatSync', 'lstatSync', 'statSync'],
+  throwType: [ 'throw', 'noThrow' ],
+}, {
+  // fstatSync does not support throwIfNoEntry
+  combinationFilter: ({ statSyncType, throwType }) => !(statSyncType === 'fstatSync' && throwType === 'noThrow'),
+});
+
+
+function main({ n, statSyncType, throwType }) {
+  const arg = (statSyncType === 'fstatSync' ?
+    (1 << 30) :
+    path.join(__dirname, 'non.existent'));
+
+  const fn = fs[statSyncType];
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    if (throwType === 'noThrow') {
+      fn(arg, { throwIfNoEntry: false });
+    } else {
+      try {
+        fn(arg);
+      } catch {
+        // Continue regardless of error.
+      }
+    }
+  }
+  bench.end(n);
+}

benchmark/fs/bench-statSync.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+  statSyncType: ['fstatSync', 'lstatSync', 'statSync'],
+});
+
+
+function main({ n, statSyncType }) {
+  const arg = (statSyncType === 'fstatSync' ?
+    fs.openSync(__filename, 'r') :
+    __dirname);
+  const fn = fs[statSyncType];
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    fn(arg);
+  }
+  bench.end(n);
+
+  if (statSyncType === 'fstatSync')
+    fs.closeSync(arg);
+}

benchmark/fs/bench-symlinkSync.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+
+if (process.platform === 'win32') {
+  console.log('Skipping: Windows does not play well with `symlink`');
+  process.exit(0);
+}
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  switch (type) {
+    case 'valid': {
+      tmpdir.refresh();
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fs.symlinkSync(tmpdir.resolve('.non-existent-symlink-file'), tmpdir.resolve(`.valid-${i}`), 'file');
+      }
+      bench.end(n);
+      break;
+    }
+
+    case 'invalid': {
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fs.symlinkSync(
+            tmpdir.resolve('.non-existent-symlink-file'),
+            __filename,
+            'file',
+          );
+        } catch {
+          hasError = true;
+        }
+      }
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-timesSync.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  func: [ 'utimes', 'futimes', 'lutimes' ],
+  n: [1e3],
+});
+
+function main({ n, type, func }) {
+  const useFds = func === 'futimes';
+  const fsFunc = fs[func + 'Sync'];
+
+  switch (type) {
+    case 'existing': {
+      const files = [];
+
+      // Populate tmpdir with mock files
+      for (let i = 0; i < n; i++) {
+        const path = tmpdir.resolve(`timessync-bench-file-${i}`);
+        fs.writeFileSync(path, 'bench');
+        files.push(useFds ? fs.openSync(path, 'r+') : path);
+      }
+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        fsFunc(files[i], i, i);
+      }
+      bench.end(n);
+
+      if (useFds) files.forEach((x) => {
+        try {
+          fs.closeSync(x);
+        } catch {
+          // do nothing
+        }
+      });
+
+      break;
+    }
+    case 'non-existing': {
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          fsFunc(useFds ? (1 << 30) : tmpdir.resolve(`.non-existing-file-${Date.now()}`), i, i);
+        } catch {
+          // do nothing
+        }
+      }
+      bench.end(n);
+
+      break;
+    }
+    default:
+      new Error('Invalid type');
+  }
+}

benchmark/fs/bench-unlinkSync.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e3],
+});
+
+function main({ n, type }) {
+  let files;
+
+  switch (type) {
+    case 'existing':
+      files = [];
+
+      // Populate tmpdir with mock files
+      for (let i = 0; i < n; i++) {
+        const path = tmpdir.resolve(`unlinksync-bench-file-${i}`);
+        fs.writeFileSync(path, 'bench');
+        files.push(path);
+      }
+      break;
+    case 'non-existing':
+      files = new Array(n).fill(tmpdir.resolve(`.non-existing-file-${Date.now()}`));
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.unlinkSync(files[i]);
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+}

benchmark/fs/bench-writeFileSync.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+// Some variants are commented out as they do not show a change and just slow
+const bench = common.createBenchmark(main, {
+  encoding: ['utf8'],
+  useFd: ['true', 'false'],
+  length: [1024, 102400, 1024 * 1024],
+
+  // useBuffer: ['true', 'false'],
+  useBuffer: ['false'],
+
+  // func: ['appendFile', 'writeFile'],
+  func: ['writeFile'],
+
+  n: [1e3],
+});
+
+function main({ n, func, encoding, length, useFd, useBuffer }) {
+  tmpdir.refresh();
+  const enc = encoding === 'undefined' ? undefined : encoding;
+  const path = tmpdir.resolve(`.writefilesync-file-${Date.now()}`);
+
+  useFd = useFd === 'true';
+  const file = useFd ? fs.openSync(path, 'w') : path;
+
+  let data = 'a'.repeat(length);
+  if (useBuffer === 'true') data = Buffer.from(data, encoding);
+
+  const fn = fs[func + 'Sync'];
+
+  bench.start();
+  for (let i = 0; i < n; ++i) {
+    fn(file, data, enc);
+  }
+  bench.end(n);
+
+  if (useFd) fs.closeSync(file);
+}

benchmark/fs/bench-writevSync.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const assert = require('assert');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const path = tmpdir.resolve(`new-file-${process.pid}`);
+fs.writeFileSync(path, 'Some content.');
+
+const bench = common.createBenchmark(main, {
+  type: ['valid', 'invalid'],
+  n: [1e5],
+});
+
+const buffer = Buffer.from('Benchmark data.');
+
+function main({ n, type }) {
+  let fd;
+  let result;
+
+  switch (type) {
+    case 'valid':
+      fd = fs.openSync(path, 'r+');
+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        result = fs.writevSync(fd, [buffer]);
+      }
+
+      bench.end(n);
+      assert.ok(result);
+      fs.closeSync(fd);
+      break;
+    case 'invalid': {
+      fd = 1 << 30;
+      let hasError = false;
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {
+          result = fs.writevSync(fd, [buffer]);
+        } catch {
+          hasError = true;
+        }
+      }
+
+      bench.end(n);
+      assert.ok(hasError);
+      break;
+    }
+    default:
+      throw new Error('Invalid type');
+  }
+}

benchmark/fs/bench_fdatasyncSync.js

@@ -0,0 +1,42 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+
+const tmpfile = tmpdir.resolve(`.existing-file-${process.pid}`);
+fs.writeFileSync(tmpfile, 'this-is-for-a-benchmark', 'utf8');
+
+const bench = common.createBenchmark(main, {
+  type: ['existing', 'non-existing'],
+  n: [1e4],
+});
+
+function main({ n, type }) {
+  let fd;
+
+  switch (type) {
+    case 'existing':
+      fd = fs.openSync(tmpfile, 'r', 0o666);
+      break;
+    case 'non-existing':
+      fd = 1 << 30;
+      break;
+    default:
+      new Error('Invalid type');
+  }
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.fdatasyncSync(fd);
+    } catch {
+      // do nothing
+    }
+  }
+
+  bench.end(n);
+
+  if (type === 'existing') fs.closeSync(fd);
+}

benchmark/fs/read-stream-throughput.js

@@ -0,0 +1,94 @@
+// Test the throughput of the fs.WriteStream class.
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+const assert = require('assert');
+
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`);
+
+const bench = common.createBenchmark(main, {
+  encodingType: ['buf', 'asc', 'utf'],
+  filesize: [1000 * 1024],
+  highWaterMark: [1024, 4096, 65535, 1024 * 1024],
+  n: 1024,
+});
+
+function main(conf) {
+  const { encodingType, highWaterMark, filesize } = conf;
+  let { n } = conf;
+
+  let encoding = '';
+  switch (encodingType) {
+    case 'buf':
+      encoding = null;
+      break;
+    case 'asc':
+      encoding = 'ascii';
+      break;
+    case 'utf':
+      encoding = 'utf8';
+      break;
+    default:
+      throw new Error(`invalid encodingType: ${encodingType}`);
+  }
+
+  // Make file
+  const buf = Buffer.allocUnsafe(filesize);
+  if (encoding === 'utf8') {
+    // ü
+    for (let i = 0; i < buf.length; i++) {
+      buf[i] = i % 2 === 0 ? 0xC3 : 0xBC;
+    }
+  } else if (encoding === 'ascii') {
+    buf.fill('a');
+  } else {
+    buf.fill('x');
+  }
+
+  try {
+    fs.unlinkSync(filename);
+  } catch {
+    // Continue regardless of error.
+  }
+  const ws = fs.createWriteStream(filename);
+  ws.on('close', runTest.bind(null, filesize, highWaterMark, encoding, n));
+  ws.on('drain', write);
+  write();
+  function write() {
+    do {
+      n--;
+    } while (false !== ws.write(buf) && n > 0);
+    if (n === 0)
+      ws.end();
+  }
+}
+
+function runTest(filesize, highWaterMark, encoding, n) {
+  assert.strictEqual(fs.statSync(filename).size, filesize * n);
+  const rs = fs.createReadStream(filename, {
+    highWaterMark,
+    encoding,
+  });
+
+  rs.on('open', () => {
+    bench.start();
+  });
+
+  let bytes = 0;
+  rs.on('data', (chunk) => {
+    bytes += chunk.length;
+  });
+
+  rs.on('end', () => {
+    try {
+      fs.unlinkSync(filename);
+    } catch {
+      // Continue regardless of error.
+    }
+    // MB/sec
+    bench.end(bytes / (1024 * 1024));
+  });
+}

benchmark/fs/readFileSync.js

@@ -0,0 +1,36 @@
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+
+const bench = common.createBenchmark(main, {
+  encoding: ['undefined', 'utf8', 'ascii'],
+  path: ['existing', 'non-existing'],
+  hasFileDescriptor: ['true', 'false'],
+  n: [1e4],
+});
+
+function main({ n, encoding, path, hasFileDescriptor }) {
+  const enc = encoding === 'undefined' ? undefined : encoding;
+  let file;
+  let shouldClose = false;
+
+  if (hasFileDescriptor === 'true') {
+    shouldClose = path === 'existing';
+    file = path === 'existing' ? fs.openSync(__filename) : -1;
+  } else {
+    file = path === 'existing' ? __filename : '/tmp/not-found';
+  }
+  bench.start();
+  for (let i = 0; i < n; ++i) {
+    try {
+      fs.readFileSync(file, enc);
+    } catch {
+      // do nothing
+    }
+  }
+  bench.end(n);
+  if (shouldClose) {
+    fs.closeSync(file);
+  }
+}

benchmark/fs/readfile-partitioned.js

@@ -0,0 +1,105 @@
+// Submit a mix of short and long jobs to the threadpool.
+// Report total job throughput.
+// If we partition the long job, overall job throughput goes up significantly.
+// However, this comes at the cost of the long job throughput.
+//
+// Short jobs: small zip jobs.
+// Long jobs: fs.readFile on a large file.
+
+'use strict';
+
+const path = require('path');
+const common = require('../common.js');
+const filename = path.resolve(__dirname,
+                              `.removeme-benchmark-garbage-${process.pid}`);
+const fs = require('fs');
+const zlib = require('zlib');
+
+const bench = common.createBenchmark(main, {
+  duration: [5],
+  encoding: ['', 'utf-8'],
+  len: [1024, 16 * 1024 * 1024],
+  concurrent: [1, 10],
+});
+
+function main({ len, duration, concurrent, encoding }) {
+  try {
+    fs.unlinkSync(filename);
+  } catch {
+    // Continue regardless of error.
+  }
+  let data = Buffer.alloc(len, 'x');
+  fs.writeFileSync(filename, data);
+  data = null;
+
+  const zipData = Buffer.alloc(1024, 'a');
+
+  let waitConcurrent = 0;
+
+  // Plus one because of zip
+  const targetConcurrency = concurrent + 1;
+  const startedAt = Date.now();
+  const endAt = startedAt + (duration * 1000);
+
+  let reads = 0;
+  let zips = 0;
+
+  bench.start();
+
+  function stop() {
+    const totalOps = reads + zips;
+    bench.end(totalOps);
+
+    try {
+      fs.unlinkSync(filename);
+    } catch {
+      // Continue regardless of error.
+    }
+  }
+
+  function read() {
+    fs.readFile(filename, encoding, afterRead);
+  }
+
+  function afterRead(er, data) {
+    if (er) {
+      throw er;
+    }
+
+    if (data.length !== len)
+      throw new Error('wrong number of bytes returned');
+
+    reads++;
+    const benchEnded = Date.now() >= endAt;
+
+    if (benchEnded && (++waitConcurrent) === targetConcurrency) {
+      stop();
+    } else if (!benchEnded) {
+      read();
+    }
+  }
+
+  function zip() {
+    zlib.deflate(zipData, afterZip);
+  }
+
+  function afterZip(er, data) {
+    if (er)
+      throw er;
+
+    zips++;
+    const benchEnded = Date.now() >= endAt;
+
+    if (benchEnded && (++waitConcurrent) === targetConcurrency) {
+      stop();
+    } else if (!benchEnded) {
+      zip();
+    }
+  }
+
+  // Start reads
+  for (let i = 0; i < concurrent; i++) read();
+
+  // Start a competing zip
+  zip();
+}

benchmark/fs/readfile-permission-enabled.js

@@ -0,0 +1,80 @@
+// Call fs.readFile with permission system enabled
+// over and over again really fast.
+// Then see how many times it got called.
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`);
+
+const bench = common.createBenchmark(main, {
+  duration: [5],
+  encoding: ['', 'utf-8'],
+  len: [1024, 16 * 1024 * 1024],
+  concurrent: [1, 10],
+}, {
+  flags: [
+    '--permission',
+    '--allow-fs-read=*',
+    '--allow-fs-write=*',
+    '--allow-child-process',
+  ],
+});
+
+function main({ len, duration, concurrent, encoding }) {
+  try {
+    fs.unlinkSync(filename);
+  } catch {
+    // Continue regardless of error.
+  }
+  let data = Buffer.alloc(len, 'x');
+  fs.writeFileSync(filename, data);
+  data = null;
+
+  let reads = 0;
+  let waitConcurrent = 0;
+
+  const startedAt = Date.now();
+  const endAt = startedAt + (duration * 1000);
+
+  bench.start();
+
+  function stop() {
+    bench.end(reads);
+
+    try {
+      fs.unlinkSync(filename);
+    } catch {
+      // Continue regardless of error.
+    }
+
+    process.exit(0);
+  }
+
+  function read() {
+    fs.readFile(filename, encoding, afterRead);
+  }
+
+  function afterRead(er, data) {
+    if (er) {
+      throw er;
+    }
+
+    if (data.length !== len)
+      throw new Error('wrong number of bytes returned');
+
+    reads++;
+    const benchEnded = Date.now() >= endAt;
+
+    if (benchEnded && (++waitConcurrent) === concurrent) {
+      stop();
+    } else if (!benchEnded) {
+      read();
+    }
+  }
+
+  for (let i = 0; i < concurrent; i++) read();
+}

benchmark/fs/readfile-promises.js

@@ -0,0 +1,82 @@
+// Call fs.promises.readFile over and over again really fast.
+// Then see how many times it got called.
+// Yes, this is a silly benchmark.  Most benchmarks are silly.
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`);
+
+const bench = common.createBenchmark(main, {
+  duration: [5],
+  encoding: ['', 'utf-8'],
+  len: [
+    1024,
+    512 * 1024,
+    4 * 1024 ** 2,
+    8 * 1024 ** 2,
+    16 * 1024 ** 2,
+    32 * 1024 ** 2,
+  ],
+  concurrent: [1, 10],
+});
+
+function main({ len, duration, concurrent, encoding }) {
+  try {
+    fs.unlinkSync(filename);
+  } catch {
+    // Continue regardless of error.
+  }
+  let data = Buffer.alloc(len, 'x');
+  fs.writeFileSync(filename, data);
+  data = null;
+
+  let reads = 0;
+  let waitConcurrent = 0;
+
+  const startedAt = Date.now();
+  const endAt = startedAt + (duration * 1000);
+
+  bench.start();
+
+  function stop() {
+    bench.end(reads);
+
+    try {
+      fs.unlinkSync(filename);
+    } catch {
+      // Continue regardless of error.
+    }
+
+    process.exit(0);
+  }
+
+  function read() {
+    fs.promises.readFile(filename, encoding)
+      .then((res) => afterRead(undefined, res))
+      .catch((err) => afterRead(err));
+  }
+
+  function afterRead(er, data) {
+    if (er) {
+      throw er;
+    }
+
+    if (data.length !== len)
+      throw new Error('wrong number of bytes returned');
+
+    reads++;
+    const benchEnded = Date.now() >= endAt;
+
+    if (benchEnded && (++waitConcurrent) === concurrent) {
+      stop();
+    } else if (!benchEnded) {
+      read();
+    }
+  }
+
+  for (let i = 0; i < concurrent; i++) read();
+}

benchmark/fs/readfile.js

@@ -0,0 +1,73 @@
+// Call fs.readFile over and over again really fast.
+// Then see how many times it got called.
+// Yes, this is a silly benchmark.  Most benchmarks are silly.
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`);
+
+const bench = common.createBenchmark(main, {
+  duration: [5],
+  encoding: ['', 'utf-8', 'ascii'],
+  len: [1024, 16 * 1024 * 1024],
+  concurrent: [1, 10],
+});
+
+function main({ len, duration, concurrent, encoding }) {
+  try {
+    fs.unlinkSync(filename);
+  } catch {
+    // Continue regardless of error.
+  }
+  let data = Buffer.alloc(len, 'x');
+  fs.writeFileSync(filename, data);
+  data = null;
+
+  let reads = 0;
+  let waitConcurrent = 0;
+
+  const startedAt = Date.now();
+  const endAt = startedAt + (duration * 1000);
+
+  bench.start();
+
+  function read() {
+    fs.readFile(filename, encoding, afterRead);
+  }
+
+  function stop() {
+    bench.end(reads);
+
+    try {
+      fs.unlinkSync(filename);
+    } catch {
+      // Continue regardless of error.
+    }
+
+    process.exit(0);
+  }
+
+  function afterRead(er, data) {
+    if (er) {
+      throw er;
+    }
+
+    if (data.length !== len)
+      throw new Error('wrong number of bytes returned');
+
+    reads++;
+    const benchEnded = Date.now() >= endAt;
+
+    if (benchEnded && (++waitConcurrent) === concurrent) {
+      stop();
+    } else if (!benchEnded) {
+      read();
+    }
+  }
+
+  for (let i = 0; i < concurrent; i++) read();
+}

benchmark/fs/write-stream-throughput.js

@@ -0,0 +1,78 @@
+// Test the throughput of the fs.WriteStream class.
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+
+const tmpdir = require('../../test/common/tmpdir');
+tmpdir.refresh();
+const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`);
+
+const bench = common.createBenchmark(main, {
+  dur: [5],
+  encodingType: ['buf', 'asc', 'utf'],
+  size: [2, 1024, 65535, 1024 * 1024],
+});
+
+function main({ dur, encodingType, size }) {
+  let encoding;
+
+  let chunk;
+  switch (encodingType) {
+    case 'buf':
+      chunk = Buffer.alloc(size, 'b');
+      break;
+    case 'asc':
+      chunk = 'a'.repeat(size);
+      encoding = 'ascii';
+      break;
+    case 'utf':
+      chunk = 'ü'.repeat(Math.ceil(size / 2));
+      encoding = 'utf8';
+      break;
+    default:
+      throw new Error(`invalid encodingType: ${encodingType}`);
+  }
+
+  try {
+    fs.unlinkSync(filename);
+  } catch {
+    // Continue regardless of error.
+  }
+
+  let started = false;
+  let ended = false;
+
+  const f = fs.createWriteStream(filename);
+  f.on('drain', write);
+  f.on('open', write);
+  f.on('close', done);
+  f.on('finish', () => {
+    ended = true;
+    const written = fs.statSync(filename).size / 1024;
+    try {
+      fs.unlinkSync(filename);
+    } catch {
+      // Continue regardless of error.
+    }
+    bench.end(written / 1024);
+  });
+
+
+  function write() {
+    if (!started) {
+      started = true;
+      setTimeout(() => {
+        f.end();
+      }, dur * 1000);
+      bench.start();
+    }
+
+    while (false !== f.write(chunk, encoding));
+  }
+
+  function done() {
+    if (!ended)
+      f.emit('finish');
+  }
+}

benchmark/fs/writefile-promises.js

@@ -0,0 +1,83 @@
+// Call fs.promises.writeFile over and over again really fast.
+// Then see how many times it got called.
+// Yes, this is a silly benchmark.  Most benchmarks are silly.
+'use strict';
+
+const common = require('../common.js');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+
+tmpdir.refresh();
+const filename = tmpdir.resolve(`.removeme-benchmark-garbage-${process.pid}`);
+let filesWritten = 0;
+const bench = common.createBenchmark(main, {
+  duration: [5],
+  encodingType: ['buf', 'asc', 'utf'],
+  size: [2, 1024, 65535, 1024 * 1024],
+  concurrent: [1, 10],
+});
+
+function main({ encodingType, duration, concurrent, size }) {
+  let encoding;
+  let chunk;
+  switch (encodingType) {
+    case 'buf':
+      chunk = Buffer.alloc(size, 'b');
+      break;
+    case 'asc':
+      chunk = 'a'.repeat(size);
+      encoding = 'ascii';
+      break;
+    case 'utf':
+      chunk = 'ü'.repeat(Math.ceil(size / 2));
+      encoding = 'utf8';
+      break;
+    default:
+      throw new Error(`invalid encodingType: ${encodingType}`);
+  }
+
+  let writes = 0;
+  let waitConcurrent = 0;
+
+  const startedAt = Date.now();
+  const endAt = startedAt + (duration * 1000);
+
+  bench.start();
+
+  function stop() {
+    bench.end(writes);
+
+    for (let i = 0; i < filesWritten; i++) {
+      try {
+        fs.unlinkSync(`${filename}-${i}`);
+      } catch {
+        // Continue regardless of error.
+      }
+    }
+
+    process.exit(0);
+  }
+
+  function write() {
+    fs.promises.writeFile(`${filename}-${filesWritten++}`, chunk, encoding)
+      .then(() => afterWrite())
+      .catch((err) => afterWrite(err));
+  }
+
+  function afterWrite(er) {
+    if (er) {
+      throw er;
+    }
+
+    writes++;
+    const benchEnded = Date.now() >= endAt;
+
+    if (benchEnded && (++waitConcurrent) === concurrent) {
+      stop();
+    } else if (!benchEnded) {
+      write();
+    }
+  }
+
+  for (let i = 0; i < concurrent; i++) write();
+}