bench: measure ticks per second of idle event loop

test/benchmark-list.h

@@ -20,6 +20,7 @@
  */
 
 BENCHMARK_DECLARE (sizes)
+BENCHMARK_DECLARE (loop_count)
 BENCHMARK_DECLARE (ping_pongs)
 BENCHMARK_DECLARE (tcp_write_batch)
 BENCHMARK_DECLARE (tcp4_pound_100)
@@ -53,6 +54,7 @@ HELPER_DECLARE    (dns_server)
 
 TASK_LIST_START
   BENCHMARK_ENTRY  (sizes)
+  BENCHMARK_ENTRY  (loop_count)
 
   BENCHMARK_ENTRY  (ping_pongs)
   BENCHMARK_HELPER (ping_pongs, tcp4_echo_server)

test/benchmark-loop-count.c

@@ -0,0 +1,58 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * 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.
+ */
+
+#include "task.h"
+#include "uv.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+static unsigned long ticks;
+static uv_idle_t idle_handle;
+static uv_timer_t timer_handle;
+
+
+static void idle_cb(uv_idle_t* handle, int status) {
+  ticks++;
+}
+
+
+static void timer_cb(uv_timer_t* handle, int status) {
+  uv_idle_stop(&idle_handle);
+  uv_timer_stop(&timer_handle);
+}
+
+
+BENCHMARK_IMPL(loop_count) {
+  uv_loop_t* loop = uv_default_loop();
+
+  uv_timer_init(loop, &timer_handle);
+  uv_timer_start(&timer_handle, timer_cb, 5000, 0);
+
+  uv_idle_init(loop, &idle_handle);
+  uv_idle_start(&idle_handle, idle_cb);
+
+  uv_run(loop);
+
+  LOGF("loop_count: %lu ticks (%.0f ticks/s)\n", ticks, ticks / 5.0);
+
+  return 0;
+}

uv.gyp

@@ -394,6 +394,7 @@
         'test/benchmark-ares.c',
         'test/benchmark-getaddrinfo.c',
         'test/benchmark-list.h',
+        'test/benchmark-loop-count.c',
         'test/benchmark-ping-pongs.c',
         'test/benchmark-pound.c',
         'test/benchmark-pump.c',