diff --git a/src/node/examples/qps_test.js b/src/node/examples/qps_test.js
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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/**
+ * This script runs a QPS test. It sends requests for a specified length of time
+ * with a specified number pending at any one time. It then outputs the measured
+ * QPS. Usage:
+ * node qps_test.js [--concurrent=count] [--time=seconds]
+ * concurrent defaults to 100 and time defaults to 10
+ */
+
+'use strict';
+
+var async = require('async');
+var parseArgs = require('minimist');
+
+var grpc = require('..');
+var testProto = grpc.load(__dirname + '/../interop/test.proto').grpc.testing;
+var interop_server = require('../interop/interop_server.js');
+
+/**
+ * Runs the QPS test. Sends requests constantly for the given number of seconds,
+ * and keeps concurrent_calls requests pending at all times. When the test ends,
+ * the callback is called with the number of calls that completed within the
+ * time limit.
+ * @param {number} concurrent_calls The number of calls to have pending
+ *     simultaneously
+ * @param {number} seconds The number of seconds to run the test for
+ * @param {function(Error, number)} callback Callback for test completion
+ */
+function runTest(concurrent_calls, seconds, callback) {
+  var testServer = interop_server.getServer(0, false);
+  testServer.server.listen();
+  var client = new testProto.TestService('localhost:' + testServer.port);
+
+  var warmup_num = 100;
+
+  /**
+   * Warms up the client to avoid counting startup time in the test result
+   * @param {function(Error)} callback Called when warmup is complete
+   */
+  function warmUp(callback) {
+    var pending = warmup_num;
+    function startCall() {
+      client.emptyCall({}, function(err, resp) {
+        if (err) {
+          callback(err);
+          return;
+        }
+        pending--;
+        if (pending === 0) {
+          callback(null);
+        }
+      });
+    }
+    for (var i = 0; i < warmup_num; i++) {
+      startCall();
+    }
+  }
+  /**
+   * Run the QPS test. Starts concurrent_calls requests, then starts a new
+   * request whenever one completes until time runs out.
+   * @param {function(Error, number)} callback Called when the test is complete.
+   *     The second argument is the number of calls that finished within the
+   *     time limit
+   */
+  function run(callback) {
+    var running = 0;
+    var count = 0;
+    var start = process.hrtime();
+    function responseCallback(err, resp) {
+      if (process.hrtime(start)[0] < seconds) {
+        count += 1;
+        client.emptyCall({}, responseCallback);
+      } else {
+        running -= 1;
+        if (running <= 0) {
+          callback(null, count);
+        }
+      }
+    }
+    for (var i = 0; i < concurrent_calls; i++) {
+      running += 1;
+      client.emptyCall({}, responseCallback);
+    }
+  }
+  async.waterfall([warmUp, run], function(err, count) {
+      testServer.server.shutdown();
+      callback(err, count);
+    });
+}
+
+if (require.main === module) {
+  var argv = parseArgs(process.argv.slice(2), {
+    default: {'concurrent': 100,
+              'time': 10}
+  });
+  runTest(argv.concurrent, argv.time, function(err, count) {
+    if (err) {
+      throw err;
+    }
+    console.log('Concurrent calls:', argv.concurrent);
+    console.log('Time:', argv.time, 'seconds');
+    console.log('QPS:', (count/argv.time));
+  });
+}