Adding perf test to makefile

Makefile

@@ -34,4 +34,8 @@ docs: .FORCE
 view-docs:
 	open docs/_build/html/index.html
 
+perf: start-server
+	php tests/perf.php
+	$(MAKE) stop-server
+
 .FORCE:

tests/Server.php

@@ -125,6 +125,18 @@ class Server
         self::$started = false;
     }
 
+    public static function wait($maxTries = 3)
+    {
+        $tries = 0;
+        while (!self::isListening() && ++$tries < $maxTries) {
+            usleep(100000);
+        }
+
+        if (!self::isListening()) {
+            throw new \RuntimeException('Unable to contact node.js server');
+        }
+    }
+
     private static function start()
     {
         if (self::$started){
@@ -134,13 +146,7 @@ class Server
         if (!self::isListening()) {
             exec('node ' . __DIR__ . \DIRECTORY_SEPARATOR . 'server.js '
                 . self::$port . ' >> /tmp/server.log 2>&1 &');
-            $tries = 0;
-            while (!self::isListening() && ++$tries < 3) {
-                usleep(100000);
-            }
-            if (!self::isListening()) {
-                throw new \RuntimeException('Unable to contact node.js server');
-            }
+            self::wait();
         }
 
         self::$started = true;

tests/perf.php

@@ -0,0 +1,47 @@
+<?php
+/*
+ * Runs a performance test against the node.js server for both serial and
+ * parallel requests. Requires PHP 5.5 or greater.
+ *
+ *     # Basic usage
+ *     make perf
+ *     # With custom options
+ *     REQUESTS=100 PARALLEL=5000 make perf
+ */
+
+require __DIR__ . '/bootstrap.php';
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Tests\Server;
+
+// Wait until the server is responding
+Server::wait();
+
+// Get custom make variables
+$total = isset($_SERVER['REQUESTS']) ? $_SERVER['REQUESTS'] : 1000;
+$parallel = isset($_SERVER['PARALLEL']) ? $_SERVER['PARALLEL'] : 25;
+
+$client = new Client(['base_url' => Server::$url]);
+
+$t = microtime(true);
+for ($i = 0; $i < $total; $i++) {
+    $client->get('/guzzle-server/perf');
+}
+$totalTime = microtime(true) - $t;
+$perRequest = ($totalTime / $total) * 1000;
+printf("Serial:   %f (%f ms / request) %d total\n",
+    $totalTime, $perRequest, $total);
+
+// Create a generator used to yield batches of requests to sendAll
+$reqs = function () use ($client, $total) {
+    for ($i = 0; $i < $total; $i++) {
+        yield $client->createRequest('GET', '/guzzle-server/perf');
+    }
+};
+
+$t = microtime(true);
+$client->sendAll($reqs(), ['parallel' => $parallel]);
+$totalTime = microtime(true) - $t;
+$perRequest = ($totalTime / $total) * 1000;
+printf("Parallel: %f (%f ms / request) %d total with %d in parallel\n",
+    $totalTime, $perRequest, $total, $parallel);