content/child/scheduler/task_queue_manager_perftest.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/child/scheduler/task_queue_manager.h"
   6
   7 #include "base/bind.h"
   8 #include "base/threading/thread.h"
   9 #include "content/child/scheduler/scheduler_message_loop_delegate.h"
  10 #include "content/child/scheduler/task_queue_selector.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12 #include "testing/perf/perf_test.h"
  13
  14 namespace content {
  15
  16 namespace {
  17
  18 class SelectorForTest : public TaskQueueSelector {
  19  public:
  20   SelectorForTest() {}
  21
  22   void RegisterWorkQueues(
  23       const std::vector<const base::TaskQueue*>& work_queues) override {
  24     work_queues_ = work_queues;
  25   }
  26
  27   bool SelectWorkQueueToService(size_t* out_queue_index) override {
  28     // Choose the oldest task, if any.
  29     bool found_one = false;
  30     for (size_t i = 0; i < work_queues_.size(); i++) {
  31       if (work_queues_[i]->empty())
  32         continue;
  33       // Note: the < comparison is correct due to the fact that the PendingTask
  34       // operator inverts its comparison operation in order to work well in a
  35       // heap based priority queue.
  36       if (!found_one ||
  37           work_queues_[*out_queue_index]->front() < work_queues_[i]->front())
  38         *out_queue_index = i;
  39       found_one = true;
  40     }
  41     CHECK(found_one);
  42     return found_one;
  43   }
  44
  45   void SetTaskQueueSelectorObserver(Observer* observer) override {}
  46
  47   void AsValueInto(base::trace_event::TracedValue* state) const override {}
  48
  49  private:
  50   std::vector<const base::TaskQueue*> work_queues_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(SelectorForTest);
  53 };
  54
  55 }  // namespace
  56
  57 class TaskQueueManagerPerfTest : public testing::Test {
  58  public:
  59   TaskQueueManagerPerfTest()
  60       : num_queues_(0),
  61         max_tasks_in_flight_(0),
  62         num_tasks_in_flight_(0),
  63         num_tasks_to_post_(0),
  64         num_tasks_to_run_(0) {}
  65
  66   void Initialize(size_t num_queues) {
  67     num_queues_ = num_queues;
  68     message_loop_.reset(new base::MessageLoop());
  69     selector_ = make_scoped_ptr(new SelectorForTest);
  70     manager_ = make_scoped_ptr(new TaskQueueManager(
  71         num_queues, SchedulerMessageLoopDelegate::Create(message_loop_.get()),
  72         selector_.get(), "fake.category"));
  73   }
  74
  75   void TestDelayedTask() {
  76     if (--num_tasks_to_run_ == 0) {
  77       message_loop_->Quit();
  78     }
  79
  80     num_tasks_in_flight_--;
  81     // NOTE there are only up to max_tasks_in_flight_ pending delayed tasks at
  82     // any one time.  Thanks to the lower_num_tasks_to_post going to zero if
  83     // there are a lot of tasks in flight, the total number of task in flight at
  84     // any one time is very variable.
  85     unsigned int lower_num_tasks_to_post =
  86         num_tasks_in_flight_ < (max_tasks_in_flight_ / 2) ? 1 : 0;
  87     unsigned int max_tasks_to_post =
  88         num_tasks_to_post_ % 2 ? lower_num_tasks_to_post : 10;
  89     for (unsigned int i = 0;
  90          i < max_tasks_to_post && num_tasks_in_flight_ < max_tasks_in_flight_ &&
  91              num_tasks_to_post_ > 0;
  92          i++) {
  93       // Choose a queue weighted towards queue 0.
  94       unsigned int queue = num_tasks_to_post_ % (num_queues_ + 1);
  95       if (queue == num_queues_) {
  96         queue = 0;
  97       }
  98       // Simulate a mix of short and longer delays.
  99       unsigned int delay =
 100           num_tasks_to_post_ % 2 ? 1 : (10 + num_tasks_to_post_ % 10);
 101       scoped_refptr<base::SingleThreadTaskRunner> runner =
 102           manager_->TaskRunnerForQueue(queue);
 103       runner->PostDelayedTask(
 104           FROM_HERE, base::Bind(&TaskQueueManagerPerfTest::TestDelayedTask,
 105                                 base::Unretained(this)),
 106           base::TimeDelta::FromMicroseconds(delay));
 107       num_tasks_in_flight_++;
 108       num_tasks_to_post_--;
 109     }
 110   }
 111
 112   void ResetAndCallTestDelayedTask(unsigned int num_tasks_to_run) {
 113     num_tasks_in_flight_ = 1;
 114     num_tasks_to_post_ = num_tasks_to_run;
 115     num_tasks_to_run_ = num_tasks_to_run;
 116     TestDelayedTask();
 117   }
 118
 119   void Benchmark(const std::string& trace, const base::Closure& test_task) {
 120     base::TimeTicks start = base::TimeTicks::Now();
 121     base::TimeTicks now;
 122     unsigned long long num_iterations = 0;
 123     do {
 124       test_task.Run();
 125       message_loop_->Run();
 126       now = base::TimeTicks::Now();
 127       num_iterations++;
 128     } while (now - start < base::TimeDelta::FromSeconds(5));
 129     perf_test::PrintResult(
 130         "task", "", trace,
 131         (now - start).InMicroseconds() / static_cast<double>(num_iterations),
 132         "us/run", true);
 133   }
 134
 135   size_t num_queues_;
 136   unsigned int max_tasks_in_flight_;
 137   unsigned int num_tasks_in_flight_;
 138   unsigned int num_tasks_to_post_;
 139   unsigned int num_tasks_to_run_;
 140   scoped_ptr<SelectorForTest> selector_;
 141   scoped_ptr<TaskQueueManager> manager_;
 142   scoped_ptr<base::MessageLoop> message_loop_;
 143 };
 144
 145 TEST_F(TaskQueueManagerPerfTest, RunTenThousandDelayedTasks_OneQueue) {
 146   Initialize(1u);
 147
 148   max_tasks_in_flight_ = 200;
 149   Benchmark("run 10000 delayed tasks with one queue",
 150             base::Bind(&TaskQueueManagerPerfTest::ResetAndCallTestDelayedTask,
 151                        base::Unretained(this), 10000));
 152 }
 153
 154 TEST_F(TaskQueueManagerPerfTest, RunTenThousandDelayedTasks_FourQueues) {
 155   Initialize(4u);
 156
 157   max_tasks_in_flight_ = 200;
 158   Benchmark("run 10000 delayed tasks with four queues",
 159             base::Bind(&TaskQueueManagerPerfTest::ResetAndCallTestDelayedTask,
 160                        base::Unretained(this), 10000));
 161 }
 162
 163 TEST_F(TaskQueueManagerPerfTest, RunTenThousandDelayedTasks_EightQueues) {
 164   Initialize(8u);
 165
 166   max_tasks_in_flight_ = 200;
 167   Benchmark("run 10000 delayed tasks with eight queues",
 168             base::Bind(&TaskQueueManagerPerfTest::ResetAndCallTestDelayedTask,
 169                        base::Unretained(this), 10000));
 170 }
 171
 172 // TODO(alexclarke): Add additional tests with different mixes of non-delayed vs
 173 // delayed tasks.
 174
 175 }  // namespace content