node/deps/uv/test/benchmark-loop-count.c

/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "task.h"
#include "uv.h"

#include <stdio.h>
#include <stdlib.h>

#define NUM_TICKS (2 * 1000 * 1000)

static unsigned long ticks;
static uv_idle_t idle_handle;
static uv_timer_t timer_handle;


static void idle_cb(uv_idle_t* handle) {
  if (++ticks == NUM_TICKS)
    uv_idle_stop(handle);
}


static void idle2_cb(uv_idle_t* handle) {
  ticks++;
}


static void timer_cb(uv_timer_t* handle) {
  uv_idle_stop(&idle_handle);
  uv_timer_stop(&timer_handle);
}


BENCHMARK_IMPL(loop_count) {
  uv_loop_t* loop = uv_default_loop();
  uint64_t ns;

  uv_idle_init(loop, &idle_handle);
  uv_idle_start(&idle_handle, idle_cb);

  ns = uv_hrtime();
  uv_run(loop, UV_RUN_DEFAULT);
  ns = uv_hrtime() - ns;

  ASSERT(ticks == NUM_TICKS);

  LOGF("loop_count: %d ticks in %.2fs (%.0f/s)\n",
       NUM_TICKS,
       ns / 1e9,
       NUM_TICKS / (ns / 1e9));

  MAKE_VALGRIND_HAPPY();
  return 0;
}


BENCHMARK_IMPL(loop_count_timed) {
  uv_loop_t* loop = uv_default_loop();

  uv_idle_init(loop, &idle_handle);
  uv_idle_start(&idle_handle, idle2_cb);

  uv_timer_init(loop, &timer_handle);
  uv_timer_start(&timer_handle, timer_cb, 5000, 0);

  uv_run(loop, UV_RUN_DEFAULT);

  LOGF("loop_count: %lu ticks (%.0f ticks/s)\n", ticks, ticks / 5.0);

  MAKE_VALGRIND_HAPPY();
  return 0;
}