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diff --git a/src/node/performance/benchmark_client_express.js b/src/node/performance/benchmark_client_express.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.
+ *
+ */
+
+/**
+ * Benchmark client module
+ * @module
+ */
+
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var util = require('util');
+var EventEmitter = require('events');
+var http = require('http');
+var https = require('https');
+
+var async = require('async');
+var _ = require('lodash');
+var PoissonProcess = require('poisson-process');
+var Histogram = require('./histogram');
+
+/**
+ * Convert a time difference, as returned by process.hrtime, to a number of
+ * nanoseconds.
+ * @param {Array.<number>} time_diff The time diff, represented as
+ *     [seconds, nanoseconds]
+ * @return {number} The total number of nanoseconds
+ */
+function timeDiffToNanos(time_diff) {
+  return time_diff[0] * 1e9 + time_diff[1];
+}
+
+function BenchmarkClient(server_targets, channels, histogram_params,
+    security_params) {
+  var options = {
+    method: 'PUT',
+    headers: {
+      'Content-Type': 'application/json'
+    }
+  };
+  var protocol;
+  if (security_params) {
+    var ca_path;
+    protocol = https;
+    this.request = _.bind(https.request, https);
+    if (security_params.use_test_ca) {
+      ca_path = path.join(__dirname, '../test/data/ca.pem');
+      var ca_data = fs.readFileSync(ca_path);
+      options.ca = ca_data;
+    }
+    if (security_params.server_host_override) {
+      var host_override = security_params.server_host_override;
+      options.servername = host_override;
+    }
+  } else {
+    protocol = http;
+  }
+
+  this.request = _.bind(protocol.request, protocol);
+
+  this.client_options = [];
+
+  for (var i = 0; i < channels; i++) {
+    var host_port;
+    host_port = server_targets[i % server_targets.length].split(':')
+    var new_options = _.assign({hostname: host_port[0], port: +host_port[1]}, options);
+    new_options.agent = new protocol.Agent(new_options);
+    this.client_options[i] = new_options;
+  }
+
+  this.histogram = new Histogram(histogram_params.resolution,
+                                 histogram_params.max_possible);
+
+  this.running = false;
+
+  this.pending_calls = 0;
+}
+
+util.inherits(BenchmarkClient, EventEmitter);
+
+function startAllClients(client_options_list, outstanding_rpcs_per_channel,
+                         makeCall, emitter) {
+  _.each(client_options_list, function(client_options) {
+    _.times(outstanding_rpcs_per_channel, function() {
+      makeCall(client_options);
+    });
+  });
+}
+
+BenchmarkClient.prototype.startClosedLoop = function(
+    outstanding_rpcs_per_channel, rpc_type, req_size, resp_size, generic) {
+  var self = this;
+
+  var options = {};
+
+  self.running = true;
+
+  if (rpc_type == 'UNARY') {
+    options.path = '/serviceProto.BenchmarkService.service/unaryCall';
+  } else {
+    self.emit('error', new Error('Unsupported rpc_type: ' + rpc_type));
+  }
+
+  if (generic) {
+    self.emit('error', new Error('Generic client not supported'));
+  }
+
+  self.last_wall_time = process.hrtime();
+
+  var argument = {
+    response_size: resp_size,
+    payload: {
+      body: '0'.repeat(req_size)
+    }
+  };
+
+  function makeCall(client_options) {
+    if (self.running) {
+      self.pending_calls++;
+      var start_time = process.hrtime();
+      var req = self.request(client_options, function(res) {
+        var res_data = '';
+        res.on('data', function(data) {
+          res_data += data;
+        });
+        res.on('end', function() {
+          JSON.parse(res_data);
+          var time_diff = process.hrtime(start_time);
+          self.histogram.add(timeDiffToNanos(time_diff));
+          makeCall(client_options);
+          self.pending_calls--;
+          if ((!self.running) && self.pending_calls == 0) {
+            self.emit('finished');
+          }
+        });
+      });
+      req.write(JSON.stringify(argument));
+      req.end();
+      req.on('error', function(error) {
+        self.emit('error', new Error('Client error: ' + error.message));
+        self.running = false;
+      });
+    }
+  }
+
+  startAllClients(_.map(self.client_options, _.partial(_.assign, options)),
+                  outstanding_rpcs_per_channel, makeCall, self);
+};
+
+BenchmarkClient.prototype.startPoisson = function(
+    outstanding_rpcs_per_channel, rpc_type, req_size, resp_size, offered_load,
+    generic) {
+  var self = this;
+
+  var options = {};
+
+  self.running = true;
+
+  if (rpc_type == 'UNARY') {
+    options.path = '/serviceProto.BenchmarkService.service/unaryCall';
+  } else {
+    self.emit('error', new Error('Unsupported rpc_type: ' + rpc_type));
+  }
+
+  if (generic) {
+    self.emit('error', new Error('Generic client not supported'));
+  }
+
+  self.last_wall_time = process.hrtime();
+
+  var argument = {
+    response_size: resp_size,
+    payload: {
+      body: '0'.repeat(req_size)
+    }
+  };
+
+  function makeCall(client_options, poisson) {
+    if (self.running) {
+      self.pending_calls++;
+      var start_time = process.hrtime();
+      var req = self.request(client_options, function(res) {
+        var res_data = '';
+        res.on('data', function(data) {
+          res_data += data;
+        });
+        res.on('end', function() {
+          JSON.parse(res_data);
+          var time_diff = process.hrtime(start_time);
+          self.histogram.add(timeDiffToNanos(time_diff));
+          self.pending_calls--;
+          if ((!self.running) && self.pending_calls == 0) {
+            self.emit('finished');
+          }
+        });
+      });
+      req.write(JSON.stringify(argument));
+      req.end();
+      req.on('error', function(error) {
+        self.emit('error', new Error('Client error: ' + error.message));
+        self.running = false;
+      });
+    } else {
+      poisson.stop();
+    }
+  }
+
+  var averageIntervalMs = (1 / offered_load) * 1000;
+
+  startAllClients(_.map(self.client_options, _.partial(_.assign, options)),
+                  outstanding_rpcs_per_channel, function(opts){
+                    var p = PoissonProcess.create(averageIntervalMs, function() {
+                      makeCall(opts, p);
+                    });
+                    p.start();
+                  }, self);
+};
+
+/**
+ * Return curent statistics for the client. If reset is set, restart
+ * statistic collection.
+ * @param {boolean} reset Indicates that statistics should be reset
+ * @return {object} Client statistics
+ */
+BenchmarkClient.prototype.mark = function(reset) {
+  var wall_time_diff = process.hrtime(this.last_wall_time);
+  var histogram = this.histogram;
+  if (reset) {
+    this.last_wall_time = process.hrtime();
+    this.histogram = new Histogram(histogram.resolution,
+                                   histogram.max_possible);
+  }
+
+  return {
+    latencies: {
+      bucket: histogram.getContents(),
+      min_seen: histogram.minimum(),
+      max_seen: histogram.maximum(),
+      sum: histogram.getSum(),
+      sum_of_squares: histogram.sumOfSquares(),
+      count: histogram.getCount()
+    },
+    time_elapsed: wall_time_diff[0] + wall_time_diff[1] / 1e9,
+    // Not sure how to measure these values
+    time_user: 0,
+    time_system: 0
+  };
+};
+
+/**
+ * Stop the clients.
+ * @param {function} callback Called when the clients have finished shutting
+ *     down
+ */
+BenchmarkClient.prototype.stop = function(callback) {
+  this.running = false;
+  this.on('finished', callback);
+};
+
+module.exports = BenchmarkClient;