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benchmark/net/net-c2s-cork.js

@@ -0,0 +1,85 @@
+// Test the speed of .pipe() with sockets
+'use strict';
+
+const common = require('../common.js');
+const net = require('net');
+const PORT = common.PORT;
+
+const bench = common.createBenchmark(main, {
+  len: [4, 8, 16, 32, 64, 128, 512, 1024],
+  type: ['buf'],
+  dur: [5],
+});
+
+let chunk;
+let encoding;
+
+function main({ dur, len, type }) {
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(len, 'x');
+      break;
+    case 'utf':
+      encoding = 'utf8';
+      chunk = 'ü'.repeat(len / 2);
+      break;
+    case 'asc':
+      encoding = 'ascii';
+      chunk = 'x'.repeat(len);
+      break;
+    default:
+      throw new Error(`invalid type: ${type}`);
+  }
+
+  const writer = new Writer();
+
+  // The actual benchmark.
+  const server = net.createServer((socket) => {
+    socket.pipe(writer);
+  });
+
+  server.listen(PORT, () => {
+    const socket = net.connect(PORT);
+    socket.on('connect', () => {
+      bench.start();
+
+      socket.on('drain', send);
+      send();
+
+      setTimeout(() => {
+        const bytes = writer.received;
+        const gbits = (bytes * 8) / (1024 * 1024 * 1024);
+        bench.end(gbits);
+        process.exit(0);
+      }, dur * 1000);
+
+      function send() {
+        socket.cork();
+        while (socket.write(chunk, encoding));
+        socket.uncork();
+      }
+    });
+  });
+}
+
+function Writer() {
+  this.received = 0;
+  this.writable = true;
+}
+
+Writer.prototype.write = function(chunk, encoding, cb) {
+  this.received += chunk.length;
+
+  if (typeof encoding === 'function')
+    encoding();
+  else if (typeof cb === 'function')
+    cb();
+
+  return true;
+};
+
+// Doesn't matter, never emits anything.
+Writer.prototype.on = function() {};
+Writer.prototype.once = function() {};
+Writer.prototype.emit = function() {};
+Writer.prototype.prependListener = function() {};

benchmark/net/net-c2s.js

@@ -0,0 +1,102 @@
+// Test the speed of .pipe() with sockets
+'use strict';
+
+const common = require('../common.js');
+const net = require('net');
+const PORT = common.PORT;
+
+const bench = common.createBenchmark(main, {
+  len: [64, 102400, 1024 * 64 * 16],
+  type: ['utf', 'asc', 'buf'],
+  dur: [5],
+}, {
+  test: { len: 1024 },
+});
+
+let chunk;
+let encoding;
+
+function main({ dur, len, type }) {
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(len, 'x');
+      break;
+    case 'utf':
+      encoding = 'utf8';
+      chunk = 'ü'.repeat(len / 2);
+      break;
+    case 'asc':
+      encoding = 'ascii';
+      chunk = 'x'.repeat(len);
+      break;
+    default:
+      throw new Error(`invalid type: ${type}`);
+  }
+
+  const reader = new Reader();
+  const writer = new Writer();
+
+  // The actual benchmark.
+  const server = net.createServer((socket) => {
+    socket.pipe(writer);
+  });
+
+  server.listen(PORT, () => {
+    const socket = net.connect(PORT);
+    socket.on('connect', () => {
+      bench.start();
+
+      reader.pipe(socket);
+
+      setTimeout(() => {
+        const bytes = writer.received;
+        const gbits = (bytes * 8) / (1024 * 1024 * 1024);
+        bench.end(gbits);
+        process.exit(0);
+      }, dur * 1000);
+    });
+  });
+}
+
+function Writer() {
+  this.received = 0;
+  this.writable = true;
+}
+
+Writer.prototype.write = function(chunk, encoding, cb) {
+  this.received += chunk.length;
+
+  if (typeof encoding === 'function')
+    encoding();
+  else if (typeof cb === 'function')
+    cb();
+
+  return true;
+};
+
+// Doesn't matter, never emits anything.
+Writer.prototype.on = function() {};
+Writer.prototype.once = function() {};
+Writer.prototype.emit = function() {};
+Writer.prototype.prependListener = function() {};
+
+
+function flow() {
+  const dest = this.dest;
+  const res = dest.write(chunk, encoding);
+  if (!res)
+    dest.once('drain', this.flow);
+  else
+    process.nextTick(this.flow);
+}
+
+function Reader() {
+  this.flow = flow.bind(this);
+  this.readable = true;
+}
+
+Reader.prototype.pipe = function(dest) {
+  this.dest = dest;
+  this.flow();
+  return dest;
+};

benchmark/net/net-is-ip-v4.js

@@ -0,0 +1,25 @@
+'use strict';
+
+const common = require('../common.js');
+const { isIPv4 } = require('net');
+
+const ips = [
+  '0.0.0.0',
+  '255.255.255.255',
+  '0.0.0.0.0',
+  '192.168.0.1',
+  '10.168.209.250',
+];
+
+const bench = common.createBenchmark(main, {
+  n: [1e7],
+});
+
+function main({ n }) {
+  bench.start();
+  for (let i = 0; i < n; ++i) {
+    for (let j = 0; j < ips.length; ++j)
+      isIPv4(ips[j]);
+  }
+  bench.end(n);
+}

benchmark/net/net-is-ip-v6.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const common = require('../common.js');
+const { isIPv6 } = require('net');
+
+const ips = [
+  '::1',
+  'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
+  '0.0.0.0',
+];
+
+const bench = common.createBenchmark(main, {
+  n: [1e7],
+});
+
+function main({ n }) {
+  bench.start();
+  for (let i = 0; i < n; ++i) {
+    for (let j = 0; j < ips.length; ++j)
+      isIPv6(ips[j]);
+  }
+  bench.end(n);
+}

benchmark/net/net-pipe.js

@@ -0,0 +1,105 @@
+// Test the speed of .pipe() with sockets
+'use strict';
+
+const common = require('../common.js');
+const net = require('net');
+const PORT = common.PORT;
+
+const bench = common.createBenchmark(main, {
+  len: [2, 64, 102400, 1024 * 64 * 16],
+  type: ['utf', 'asc', 'buf'],
+  dur: [5],
+}, {
+  test: { len: 1024 },
+});
+
+let chunk;
+let encoding;
+
+function main({ dur, len, type }) {
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(len, 'x');
+      break;
+    case 'utf':
+      encoding = 'utf8';
+      chunk = 'ü'.repeat(len / 2);
+      break;
+    case 'asc':
+      encoding = 'ascii';
+      chunk = 'x'.repeat(len);
+      break;
+    default:
+      throw new Error(`invalid type: ${type}`);
+  }
+
+  const reader = new Reader();
+  const writer = new Writer();
+
+  // The actual benchmark.
+  const server = net.createServer((socket) => {
+    socket.pipe(socket);
+  });
+
+  server.listen(PORT, () => {
+    const socket = net.connect(PORT);
+    socket.on('connect', () => {
+      bench.start();
+
+      reader.pipe(socket);
+      socket.pipe(writer);
+
+      setTimeout(() => {
+        // Multiply by 2 since we're sending it first one way
+        // then back again.
+        const bytes = writer.received * 2;
+        const gbits = (bytes * 8) / (1024 * 1024 * 1024);
+        bench.end(gbits);
+        process.exit(0);
+      }, dur * 1000);
+    });
+  });
+}
+
+function Writer() {
+  this.received = 0;
+  this.writable = true;
+}
+
+Writer.prototype.write = function(chunk, encoding, cb) {
+  this.received += chunk.length;
+
+  if (typeof encoding === 'function')
+    encoding();
+  else if (typeof cb === 'function')
+    cb();
+
+  return true;
+};
+
+// Doesn't matter, never emits anything.
+Writer.prototype.on = function() {};
+Writer.prototype.once = function() {};
+Writer.prototype.emit = function() {};
+Writer.prototype.prependListener = function() {};
+
+
+function flow() {
+  const dest = this.dest;
+  const res = dest.write(chunk, encoding);
+  if (!res)
+    dest.once('drain', this.flow);
+  else
+    process.nextTick(this.flow);
+}
+
+function Reader() {
+  this.flow = flow.bind(this);
+  this.readable = true;
+}
+
+Reader.prototype.pipe = function(dest) {
+  this.dest = dest;
+  this.flow();
+  return dest;
+};

benchmark/net/net-s2c.js

@@ -0,0 +1,138 @@
+// Test the speed of .pipe() with sockets
+'use strict';
+
+const common = require('../common.js');
+const PORT = common.PORT;
+
+const bench = common.createBenchmark(main, {
+  sendchunklen: [256, 32 * 1024, 128 * 1024, 16 * 64 * 1024],
+  type: ['utf', 'asc', 'buf'],
+  recvbuflen: [0, 64 * 1024, 1024 * 1024],
+  recvbufgenfn: ['true', 'false'],
+  dur: [5],
+}, {
+  test: { sendchunklen: 256 },
+});
+
+let chunk;
+let encoding;
+let recvbuf;
+let received = 0;
+
+function main({ dur, sendchunklen, type, recvbuflen, recvbufgenfn }) {
+  if (isFinite(recvbuflen) && recvbuflen > 0)
+    recvbuf = Buffer.alloc(recvbuflen);
+
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(sendchunklen, 'x');
+      break;
+    case 'utf':
+      encoding = 'utf8';
+      chunk = 'ü'.repeat(sendchunklen / 2);
+      break;
+    case 'asc':
+      encoding = 'ascii';
+      chunk = 'x'.repeat(sendchunklen);
+      break;
+    default:
+      throw new Error(`invalid type: ${type}`);
+  }
+
+  const reader = new Reader();
+  let writer;
+  let socketOpts;
+  if (recvbuf === undefined) {
+    writer = new Writer();
+    socketOpts = { port: PORT };
+  } else {
+    let buffer = recvbuf;
+    if (recvbufgenfn === 'true') {
+      let bufidx = -1;
+      const bufpool = [
+        recvbuf,
+        Buffer.from(recvbuf),
+        Buffer.from(recvbuf),
+      ];
+      buffer = () => {
+        bufidx = (bufidx + 1) % bufpool.length;
+        return bufpool[bufidx];
+      };
+    }
+    socketOpts = {
+      port: PORT,
+      onread: {
+        buffer,
+        callback: function(nread, buf) {
+          received += nread;
+        },
+      },
+    };
+  }
+
+  // The actual benchmark.
+  const server = net.createServer((socket) => {
+    reader.pipe(socket);
+  });
+
+  server.listen(PORT, () => {
+    const socket = net.connect(socketOpts);
+    socket.on('connect', () => {
+      bench.start();
+
+      if (recvbuf === undefined)
+        socket.pipe(writer);
+
+      setTimeout(() => {
+        const bytes = received;
+        const gbits = (bytes * 8) / (1024 * 1024 * 1024);
+        bench.end(gbits);
+        process.exit(0);
+      }, dur * 1000);
+    });
+  });
+}
+
+const net = require('net');
+
+function Writer() {
+  this.writable = true;
+}
+
+Writer.prototype.write = function(chunk, encoding, cb) {
+  received += chunk.length;
+
+  if (typeof encoding === 'function')
+    encoding();
+  else if (typeof cb === 'function')
+    cb();
+
+  return true;
+};
+
+// Doesn't matter, never emits anything.
+Writer.prototype.on = function() {};
+Writer.prototype.once = function() {};
+Writer.prototype.emit = function() {};
+Writer.prototype.prependListener = function() {};
+
+
+function flow() {
+  const dest = this.dest;
+  const res = dest.write(chunk, encoding);
+  if (!res)
+    dest.once('drain', this.flow);
+  else
+    process.nextTick(this.flow);
+}
+
+function Reader() {
+  this.flow = flow.bind(this);
+  this.readable = true;
+}
+
+Reader.prototype.pipe = function(dest) {
+  this.dest = dest;
+  this.flow();
+  return dest;
+};

benchmark/net/net-wrap-js-stream-passthrough.js

@@ -0,0 +1,97 @@
+// Test the speed of .pipe() with JSStream wrapping for PassThrough streams
+'use strict';
+
+const common = require('../common.js');
+const { PassThrough } = require('stream');
+
+const bench = common.createBenchmark(main, {
+  len: [64, 102400, 1024 * 64 * 16],
+  type: ['utf', 'asc', 'buf'],
+  dur: [5],
+}, {
+  test: { len: 64 },
+  flags: ['--expose-internals'],
+});
+
+let chunk;
+let encoding;
+
+function main({ dur, len, type }) {
+  // Can only require internals inside main().
+  const JSStreamWrap = require('internal/js_stream_socket');
+
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(len, 'x');
+      break;
+    case 'utf':
+      encoding = 'utf8';
+      chunk = 'ü'.repeat(len / 2);
+      break;
+    case 'asc':
+      encoding = 'ascii';
+      chunk = 'x'.repeat(len);
+      break;
+    default:
+      throw new Error(`invalid type: ${type}`);
+  }
+
+  const reader = new Reader();
+  const writer = new Writer();
+
+  // The actual benchmark.
+  const fakeSocket = new JSStreamWrap(new PassThrough());
+  bench.start();
+  reader.pipe(fakeSocket);
+  fakeSocket.pipe(writer);
+
+  setTimeout(() => {
+    const bytes = writer.received;
+    const gbits = (bytes * 8) / (1024 * 1024 * 1024);
+    bench.end(gbits);
+    process.exit(0);
+  }, dur * 1000);
+}
+
+function Writer() {
+  this.received = 0;
+  this.writable = true;
+}
+
+Writer.prototype.write = function(chunk, encoding, cb) {
+  this.received += chunk.length;
+
+  if (typeof encoding === 'function')
+    encoding();
+  else if (typeof cb === 'function')
+    cb();
+
+  return true;
+};
+
+// Doesn't matter, never emits anything.
+Writer.prototype.on = function() {};
+Writer.prototype.once = function() {};
+Writer.prototype.emit = function() {};
+Writer.prototype.prependListener = function() {};
+
+
+function flow() {
+  const dest = this.dest;
+  const res = dest.write(chunk, encoding);
+  if (!res)
+    dest.once('drain', this.flow);
+  else
+    process.nextTick(this.flow);
+}
+
+function Reader() {
+  this.flow = flow.bind(this);
+  this.readable = true;
+}
+
+Reader.prototype.pipe = function(dest) {
+  this.dest = dest;
+  this.flow();
+  return dest;
+};

benchmark/net/tcp-raw-c2s.js

@@ -0,0 +1,133 @@
+// In this benchmark, we connect a client to the server, and write
+// as many bytes as we can in the specified time (default = 10s)
+'use strict';
+
+const common = require('../common.js');
+const util = require('util');
+
+// If there are --dur=N and --len=N args, then
+// run the function with those settings.
+// if not, then queue up a bunch of child processes.
+const bench = common.createBenchmark(main, {
+  len: [102400, 1024 * 64 * 16],
+  type: ['utf', 'asc', 'buf'],
+  dur: [5],
+}, {
+  test: { len: 1024 },
+  flags: [ '--expose-internals', '--no-warnings' ],
+});
+
+function main({ dur, len, type }) {
+  const {
+    TCP,
+    TCPConnectWrap,
+    constants: TCPConstants,
+  } = common.binding('tcp_wrap');
+  const { WriteWrap } = common.binding('stream_wrap');
+  const PORT = common.PORT;
+
+  const serverHandle = new TCP(TCPConstants.SERVER);
+  let err = serverHandle.bind('127.0.0.1', PORT);
+  if (err)
+    fail(err, 'bind');
+
+  err = serverHandle.listen(511);
+  if (err)
+    fail(err, 'listen');
+
+  serverHandle.onconnection = function(err, clientHandle) {
+    if (err)
+      fail(err, 'connect');
+
+    // The meat of the benchmark is right here:
+    bench.start();
+    let bytes = 0;
+
+    setTimeout(() => {
+      // report in Gb/sec
+      bench.end((bytes * 8) / (1024 * 1024 * 1024));
+      process.exit(0);
+    }, dur * 1000);
+
+    clientHandle.onread = function(buffer) {
+      // We're not expecting to ever get an EOF from the client.
+      // Just lots of data forever.
+      if (!buffer)
+        fail('read');
+
+      // Don't slice the buffer. The point of this is to isolate, not
+      // simulate real traffic.
+      bytes += buffer.byteLength;
+    };
+
+    clientHandle.readStart();
+  };
+
+  client(type, len);
+
+  function fail(err, syscall) {
+    throw util._errnoException(err, syscall);
+  }
+
+  function client(type, len) {
+    let chunk;
+    switch (type) {
+      case 'buf':
+        chunk = Buffer.alloc(len, 'x');
+        break;
+      case 'utf':
+        chunk = 'ü'.repeat(len / 2);
+        break;
+      case 'asc':
+        chunk = 'x'.repeat(len);
+        break;
+      default:
+        throw new Error(`invalid type: ${type}`);
+    }
+
+    const clientHandle = new TCP(TCPConstants.SOCKET);
+    const connectReq = new TCPConnectWrap();
+    const err = clientHandle.connect(connectReq, '127.0.0.1', PORT);
+
+    if (err)
+      fail(err, 'connect');
+
+    clientHandle.readStart();
+
+    connectReq.oncomplete = function(err) {
+      if (err)
+        fail(err, 'connect');
+
+      while (clientHandle.writeQueueSize === 0)
+        write();
+    };
+
+    function write() {
+      const writeReq = new WriteWrap();
+      writeReq.oncomplete = afterWrite;
+      let err;
+      switch (type) {
+        case 'buf':
+          err = clientHandle.writeBuffer(writeReq, chunk);
+          break;
+        case 'utf':
+          err = clientHandle.writeUtf8String(writeReq, chunk);
+          break;
+        case 'asc':
+          err = clientHandle.writeAsciiString(writeReq, chunk);
+          break;
+      }
+
+      if (err)
+        fail(err, 'write');
+    }
+
+    function afterWrite(err, handle) {
+      if (err)
+        fail(err, 'write');
+
+      while (clientHandle.writeQueueSize === 0)
+        write();
+    }
+  }
+}

benchmark/net/tcp-raw-pipe.js

@@ -0,0 +1,146 @@
+// In this benchmark, we connect a client to the server, and write
+// as many bytes as we can in the specified time (default = 10s)
+'use strict';
+
+const common = require('../common.js');
+const util = require('util');
+
+// If there are --dur=N and --len=N args, then
+// run the function with those settings.
+// if not, then queue up a bunch of child processes.
+const bench = common.createBenchmark(main, {
+  len: [102400, 1024 * 64 * 16],
+  type: ['utf', 'asc', 'buf'],
+  dur: [5],
+}, {
+  test: { len: 1024 },
+  flags: [ '--expose-internals', '--no-warnings' ],
+});
+
+function main({ dur, len, type }) {
+  const {
+    TCP,
+    TCPConnectWrap,
+    constants: TCPConstants,
+  } = common.binding('tcp_wrap');
+  const { WriteWrap } = common.binding('stream_wrap');
+  const PORT = common.PORT;
+
+  function fail(err, syscall) {
+    throw util._errnoException(err, syscall);
+  }
+
+  // Server
+  const serverHandle = new TCP(TCPConstants.SERVER);
+  let err = serverHandle.bind('127.0.0.1', PORT);
+  if (err)
+    fail(err, 'bind');
+
+  err = serverHandle.listen(511);
+  if (err)
+    fail(err, 'listen');
+
+  serverHandle.onconnection = function(err, clientHandle) {
+    if (err)
+      fail(err, 'connect');
+
+    clientHandle.onread = function(buffer) {
+      // We're not expecting to ever get an EOF from the client.
+      // Just lots of data forever.
+      if (!buffer)
+        fail('read');
+
+      const writeReq = new WriteWrap();
+      writeReq.async = false;
+      err = clientHandle.writeBuffer(writeReq, Buffer.from(buffer));
+
+      if (err)
+        fail(err, 'write');
+
+      writeReq.oncomplete = function(status, handle, err) {
+        if (err)
+          fail(err, 'write');
+      };
+    };
+
+    clientHandle.readStart();
+  };
+
+  // Client
+  let chunk;
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(len, 'x');
+      break;
+    case 'utf':
+      chunk = 'ü'.repeat(len / 2);
+      break;
+    case 'asc':
+      chunk = 'x'.repeat(len);
+      break;
+    default:
+      throw new Error(`invalid type: ${type}`);
+  }
+
+  const clientHandle = new TCP(TCPConstants.SOCKET);
+  const connectReq = new TCPConnectWrap();
+  let bytes = 0;
+
+  err = clientHandle.connect(connectReq, '127.0.0.1', PORT);
+  if (err)
+    fail(err, 'connect');
+
+  clientHandle.onread = function(buffer) {
+    if (!buffer)
+      fail('read');
+
+    bytes += buffer.byteLength;
+  };
+
+  connectReq.oncomplete = function(err) {
+    if (err)
+      fail(err, 'connect');
+
+    bench.start();
+
+    clientHandle.readStart();
+
+    setTimeout(() => {
+      // Multiply by 2 since we're sending it first one way
+      // then back again.
+      bench.end(2 * (bytes * 8) / (1024 * 1024 * 1024));
+      process.exit(0);
+    }, dur * 1000);
+
+    while (clientHandle.writeQueueSize === 0)
+      write();
+  };
+
+  function write() {
+    const writeReq = new WriteWrap();
+    writeReq.oncomplete = afterWrite;
+    let err;
+    switch (type) {
+      case 'buf':
+        err = clientHandle.writeBuffer(writeReq, chunk);
+        break;
+      case 'utf':
+        err = clientHandle.writeUtf8String(writeReq, chunk);
+        break;
+      case 'asc':
+        err = clientHandle.writeAsciiString(writeReq, chunk);
+        break;
+    }
+
+    if (err)
+      fail(err, 'write');
+  }
+
+  function afterWrite(err, handle) {
+    if (err)
+      fail(err, 'write');
+
+    while (clientHandle.writeQueueSize === 0)
+      write();
+  }
+}

benchmark/net/tcp-raw-s2c.js

@@ -0,0 +1,136 @@
+// In this benchmark, we connect a client to the server, and write
+// as many bytes as we can in the specified time (default = 10s)
+'use strict';
+
+const common = require('../common.js');
+const util = require('util');
+
+// If there are dur=N and len=N args, then
+// run the function with those settings.
+// If not, then queue up a bunch of child processes.
+const bench = common.createBenchmark(main, {
+  len: [102400, 1024 * 64 * 16],
+  type: ['utf', 'asc', 'buf'],
+  dur: [5],
+}, {
+  test: { len: 1024 },
+  flags: [ '--expose-internals', '--no-warnings' ],
+});
+
+function main({ dur, len, type }) {
+  const {
+    TCP,
+    TCPConnectWrap,
+    constants: TCPConstants,
+  } = common.binding('tcp_wrap');
+  const { WriteWrap } = common.binding('stream_wrap');
+  const PORT = common.PORT;
+
+  const serverHandle = new TCP(TCPConstants.SERVER);
+  let err = serverHandle.bind('127.0.0.1', PORT);
+  if (err)
+    fail(err, 'bind');
+
+  err = serverHandle.listen(511);
+  if (err)
+    fail(err, 'listen');
+
+  serverHandle.onconnection = function(err, clientHandle) {
+    if (err)
+      fail(err, 'connect');
+
+    let chunk;
+    switch (type) {
+      case 'buf':
+        chunk = Buffer.alloc(len, 'x');
+        break;
+      case 'utf':
+        chunk = 'ü'.repeat(len / 2);
+        break;
+      case 'asc':
+        chunk = 'x'.repeat(len);
+        break;
+      default:
+        throw new Error(`invalid type: ${type}`);
+    }
+
+    clientHandle.readStart();
+
+    while (clientHandle.writeQueueSize === 0)
+      write();
+
+    function write() {
+      const writeReq = new WriteWrap();
+      writeReq.async = false;
+      writeReq.oncomplete = afterWrite;
+      let err;
+      switch (type) {
+        case 'buf':
+          err = clientHandle.writeBuffer(writeReq, chunk);
+          break;
+        case 'utf':
+          err = clientHandle.writeUtf8String(writeReq, chunk);
+          break;
+        case 'asc':
+          err = clientHandle.writeAsciiString(writeReq, chunk);
+          break;
+      }
+
+      if (err) {
+        fail(err, 'write');
+      } else if (!writeReq.async) {
+        process.nextTick(() => {
+          afterWrite(0, clientHandle);
+        });
+      }
+    }
+
+    function afterWrite(status, handle) {
+      if (status)
+        fail(status, 'write');
+
+      while (clientHandle.writeQueueSize === 0)
+        write();
+    }
+  };
+
+  client(dur);
+
+  function fail(err, syscall) {
+    throw util._errnoException(err, syscall);
+  }
+
+  function client(dur) {
+    const clientHandle = new TCP(TCPConstants.SOCKET);
+    const connectReq = new TCPConnectWrap();
+    const err = clientHandle.connect(connectReq, '127.0.0.1', PORT);
+
+    if (err)
+      fail(err, 'connect');
+
+    connectReq.oncomplete = function() {
+      let bytes = 0;
+      clientHandle.onread = function(buffer) {
+        // We're not expecting to ever get an EOF from the client.
+        // Just lots of data forever.
+        if (!buffer)
+          fail('read');
+
+        // Don't slice the buffer. The point of this is to isolate, not
+        // simulate real traffic.
+        bytes += buffer.byteLength;
+      };
+
+      clientHandle.readStart();
+
+      // The meat of the benchmark is right here:
+      bench.start();
+
+      setTimeout(() => {
+        // report in Gb/sec
+        bench.end((bytes * 8) / (1024 * 1024 * 1024));
+        process.exit(0);
+      }, dur * 1000);
+    };
+  }
+}