benchmark: add test for module loader

Adds a test for benchmarking the module loader, needed for benchmarking
changes / refacortings in the module loader.

Reviewed-by: Trevor Norris <trev.norris@gmail.com>
Reviewed-by: Timothy J Fontaine <tjfontaine@gmail.com>

benchmark/misc/module-loader.js

@@ -0,0 +1,72 @@
+// 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 fs = require('fs');
+var path = require('path');
+var common = require('../common.js');
+var packageJson = '{"main": "index.js"}';
+
+var tmpDirectory = path.join(__dirname, '..', 'tmp');
+var benchmarkDirectory = path.join(tmpDirectory, 'nodejs-benchmark-module');
+
+var bench = common.createBenchmark(main, {
+  thousands: [50]
+});
+
+function main(conf) {
+  rmrf(tmpDirectory);
+  try { fs.mkdirSync(tmpDirectory); } catch (e) {}
+  try { fs.mkdirSync(benchmarkDirectory); } catch (e) {}
+
+  var n = +conf.thousands * 1e3;
+  for (var i = 0; i <= n; i++) {
+    fs.mkdirSync(benchmarkDirectory + i);
+    fs.writeFileSync(benchmarkDirectory + i + '/package.json', '{"main": "index.js"}');
+    fs.writeFileSync(benchmarkDirectory + i + '/index.js', 'module.exports = "";');
+  }
+
+  measure(n);
+}
+
+function measure(n) {
+  bench.start();
+  for (var i = 0; i <= n; i++) {
+    require(benchmarkDirectory + i);
+  }
+  bench.end(n / 1e3);
+}
+
+function rmrf(location) {
+  if (fs.existsSync(location)) {
+    var things = fs.readdirSync(location);
+    things.forEach(function(thing) {
+      var cur = path.join(location, thing),
+          isDirectory = fs.statSync(cur).isDirectory();
+      if (isDirectory) {
+        rmrf(cur);
+        return;
+      }
+      fs.unlinkSync(cur);
+    });
+    fs.rmdirSync(location);
+  }
+}