bench: add continuous stress test

Useful in tracking down or at least demonstrating memory leaks.

diff --git a/benchmark/http_bench.js b/benchmark/http_bench.js
new file mode 100644 (file)
index 0000000..842b942
--- /dev/null
+++ b/benchmark/http_bench.js
@@ -0,0 +1,127 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var spawn = require('child_process').spawn;
+var cluster = require('cluster');
+var http = require('http');
+
+var options = {
+  mode: 'master',
+  host: '127.0.0.1',
+  port: 22344,
+  path: '/',
+  servers: 1,
+  clients: 1
+};
+
+for (var i = 2; i < process.argv.length; ++i) {
+  var args = process.argv[i].split('=', 2);
+  var key = args[0];
+  var val = args[1];
+  options[key] = val;
+}
+
+switch (options.mode) {
+case 'master': startMaster(); break;
+case 'server': startServer(); break;
+case 'client': startClient(); break;
+default: throw new Error('Bad mode: ' + options.mode);
+}
+
+process.title = 'http_bench[' + options.mode + ']';
+
+// monkey-patch the log functions so they include name + pid
+console.log = patch(console.log);
+console.trace = patch(console.trace);
+console.error = patch(console.error);
+
+function patch(fun) {
+  var prefix = process.title + '[' + process.pid + '] ';
+  return function() {
+    var args = Array.prototype.slice.call(arguments);
+    args[0] = prefix + args[0];
+    return fun.apply(console, args);
+  };
+}
+
+function startMaster() {
+  if (!cluster.isMaster) return startServer();
+
+  for (var i = ~~options.servers; i > 0; --i) cluster.fork();
+
+  for (var i = ~~options.clients; i > 0; --i) {
+    var cp = spawn(process.execPath, [__filename, 'mode=client']);
+    cp.stdout.pipe(process.stdout);
+    cp.stderr.pipe(process.stderr);
+  }
+}
+
+function startServer() {
+  http.createServer(onRequest).listen(options.port, options.host);
+
+  var body = Array(1024).join('x');
+  var headers = {'Content-Length': '' + body.length};
+
+  function onRequest(req, res) {
+    req.on('error', onError);
+    res.on('error', onError);
+    res.writeHead(200, headers);
+    res.end(body);
+  }
+
+  function onError(err) {
+    console.error(err.stack);
+  }
+}
+
+function startClient() {
+  // send off a bunch of concurrent requests
+  // TODO make configurable
+  sendRequest();
+  sendRequest();
+
+  function sendRequest() {
+    var req = http.request(options, onConnection);
+    req.on('error', onError);
+    req.end();
+  }
+
+  // add a little back-off to prevent EADDRNOTAVAIL errors, it's pretty easy
+  // to exhaust the available port range
+  function relaxedSendRequest() {
+    setTimeout(sendRequest, 1);
+  }
+
+  function onConnection(res) {
+    res.on('error', onError);
+    res.on('data', onData);
+    res.on('end', relaxedSendRequest);
+  }
+
+  function onError(err) {
+    console.error(err.stack);
+    relaxedSendRequest();
+  }
+
+  function onData(data) {
+    // this space intentionally left blank
+  }
+}