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diff --git a/src/node/stress/stress_client.js b/src/node/stress/stress_client.js
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+/*
+ *
+ * Copyright 2016, 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.
+ *
+ */
+
+'use strict';
+
+var _ = require('lodash');
+
+var grpc = require('../../..');
+
+var interop_client = require('../interop/interop_client');
+var MetricsServer = require('./metrics_server');
+
+var running;
+
+var metrics_server;
+
+var start_time;
+var query_count;
+
+function makeCall(client, test_cases) {
+  if (!running) {
+    return;
+  }
+  var test_case = test_cases[_.random(test_cases.length - 1)];
+  interop_client.test_cases[test_case].run(client, function() {
+    query_count += 1;
+    makeCall(client, test_cases);
+  });
+}
+
+function makeCalls(client, test_cases, parallel_calls_per_channel) {
+  _.times(parallel_calls_per_channel, function() {
+    makeCall(client, test_cases);
+  });
+}
+
+function getQps() {
+  var diff = process.hrtime(start_time);
+  var seconds = diff[0] + diff[1] / 1e9;
+  return {long_value: query_count / seconds};
+}
+
+function start(server_addresses, test_cases, channels_per_server,
+               parallel_calls_per_channel, metrics_port) {
+  running = true;
+  /* Assuming that we are not calling unimplemented_method. The client class
+   * used by empty_unary is (currently) the client class used by every interop
+   * test except unimplemented_method */
+  var Client = interop_client.test_cases.empty_unary.Client;
+  /* Make channels_per_server clients connecting to each server address */
+  var channels = _.flatten(_.times(
+      channels_per_server, _.partial(_.map, server_addresses, function(address) {
+        return new Client(address, grpc.credentials.createInsecure());
+      })));
+  metrics_server = new MetricsServer(metrics_port);
+  metrics_server.registerGauge('qps', getQps);
+  start_time = process.hrtime();
+  query_count = 0;
+  _.each(channels, _.partial(makeCalls, _, test_cases,
+                             parallel_calls_per_channel));
+  metrics_server.start();
+}
+
+function stop() {
+  running = false;
+  metrics_server.shutdown();
+  console.log('QPS: ' + getQps().long_value);
+}
+
+function main() {
+  var parseArgs = require('minimist');
+  var argv = parseArgs(process.argv, {
+    string: ['server_addresses', 'test_cases', 'metrics_port'],
+    default: {'server_addresses': 'localhost:8080',
+              'test_duration_secs': -1,
+              'num_channels_per_server': 1,
+              'num_stubs_per_channel': 1,
+              'metrics_port': '8081'}
+  });
+  var server_addresses = argv.server_addresses.split(',');
+  /* Generate an array of test cases, where the number of instances of each name
+   * corresponds to the number given in the argument.
+   * e.g. 'empty_unary:1,large_unary:2' =>
+   * ['empty_unary', 'large_unary', 'large_unary'] */
+  var test_cases = _.flatten(_.map(argv.test_cases.split(','), function(value) {
+    var split = value.split(':');
+    return _.times(split[1], _.constant(split[0]));
+  }));
+  start(server_addresses, test_cases, argv.num_channels_per_server,
+        argv.num_stubs_per_channel, argv.metrics_port);
+  if (argv.test_duration_secs > -1) {
+    setTimeout(stop, argv.test_duration_secs * 1000);
+  }
+}
+
+main();