content/renderer/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/renderer/scheduler/task_queue_manager.h"
   6
   7 #include "base/bind.h"
   8 #include "base/threading/thread.h"
   9 #include "content/renderer/scheduler/renderer_scheduler_message_loop_delegate.h"
  10 #include "content/renderer/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 AsValueInto(base::trace_event::TracedValue* state) const override {}
  46
  47  private:
  48   std::vector<const base::TaskQueue*> work_queues_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(SelectorForTest);
  51 };
  52
  53 }  // namespace
  54
  55 class TaskQueueManagerPerfTest : public testing::Test {
  56  public:
  57   TaskQueueManagerPerfTest()
  58       : num_queues_(0),
  59         max_tasks_in_flight_(0),
  60         num_tasks_in_flight_(0),
  61         num_tasks_to_post_(0),
  62         num_tasks_to_run_(0) {}
  63
  64   void Initialize(size_t num_queues) {
  65     num_queues_ = num_queues;
  66     message_loop_.reset(new base::MessageLoop());
  67     selector_ = make_scoped_ptr(new SelectorForTest);
  68     manager_ = make_scoped_ptr(new TaskQueueManager(
  69         num_queues,
  70         RendererSchedulerMessageLoopDelegate::Create(message_loop_.get()),
  71         selector_.get()));
  72   }
  73
  74   void TestDelayedTask() {
  75     if (--num_tasks_to_run_ == 0) {
  76       message_loop_->Quit();
  77     }
  78
  79     num_tasks_in_flight_--;
  80     // NOTE there are only up to max_tasks_in_flight_ pending delayed tasks at
  81     // any one time.  Thanks to the lower_num_tasks_to_post going to zero if
  82     // there are a lot of tasks in flight, the total number of task in flight at
  83     // any one time is very variable.
  84     unsigned int lower_num_tasks_to_post =
  85         num_tasks_in_flight_ < (max_tasks_in_flight_ / 2) ? 1 : 0;
  86     unsigned int max_tasks_to_post =
  87         num_tasks_to_post_ % 2 ? lower_num_tasks_to_post : 10;
  88     for (unsigned int i = 0;
  89          i < max_tasks_to_post && num_tasks_in_flight_ < max_tasks_in_flight_ &&
  90              num_tasks_to_post_ > 0;
  91          i++) {
  92       // Choose a queue weighted towards queue 0.
  93       unsigned int queue = num_tasks_to_post_ % (num_queues_ + 1);
  94       if (queue == num_queues_) {
  95         queue = 0;
  96       }
  97       // Simulate a mix of short and longer delays.
  98       unsigned int delay =
  99           num_tasks_to_post_ % 2 ? 1 : (10 + num_tasks_to_post_ % 10);
 100       scoped_refptr<base::SingleThreadTaskRunner> runner =
 101           manager_->TaskRunnerForQueue(queue);
 102       runner->PostDelayedTask(
 103           FROM_HERE, base::Bind(&TaskQueueManagerPerfTest::TestDelayedTask,
 104                                 base::Unretained(this)),
 105           base::TimeDelta::FromMicroseconds(delay));
 106       num_tasks_in_flight_++;
 107       num_tasks_to_post_--;
 108     }
 109   }
 110
 111   void ResetAndCallTestDelayedTask(unsigned int num_tasks_to_run) {
 112     num_tasks_in_flight_ = 1;
 113     num_tasks_to_post_ = num_tasks_to_run;
 114     num_tasks_to_run_ = num_tasks_to_run;
 115     TestDelayedTask();
 116   }
 117
 118   void Benchmark(const std::string& trace, const base::Closure& test_task) {
 119     base::TimeTicks start = base::TimeTicks::Now();
 120     base::TimeTicks now;
 121     unsigned long long num_iterations = 0;
 122     do {
 123       test_task.Run();
 124       message_loop_->Run();
 125       now = base::TimeTicks::Now();
 126       num_iterations++;
 127     } while (now - start < base::TimeDelta::FromSeconds(5));
 128     perf_test::PrintResult(
 129         "task", "", trace,
 130         (now - start).InMicroseconds() / static_cast<double>(num_iterations),
 131         "us/run", true);
 132   }
 133
 134   size_t num_queues_;
 135   unsigned int max_tasks_in_flight_;
 136   unsigned int num_tasks_in_flight_;
 137   unsigned int num_tasks_to_post_;
 138   unsigned int num_tasks_to_run_;
 139   scoped_ptr<SelectorForTest> selector_;
 140   scoped_ptr<TaskQueueManager> manager_;
 141   scoped_ptr<base::MessageLoop> message_loop_;
 142 };
 143
 144 TEST_F(TaskQueueManagerPerfTest, RunTenThousandDelayedTasks_OneQueue) {
 145   Initialize(1u);
 146
 147   max_tasks_in_flight_ = 200;
 148   Benchmark("run 10000 delayed tasks with one queue",
 149             base::Bind(&TaskQueueManagerPerfTest::ResetAndCallTestDelayedTask,
 150                        base::Unretained(this), 10000));
 151 }
 152
 153 TEST_F(TaskQueueManagerPerfTest, RunTenThousandDelayedTasks_FourQueues) {
 154   Initialize(4u);
 155
 156   max_tasks_in_flight_ = 200;
 157   Benchmark("run 10000 delayed tasks with four queues",
 158             base::Bind(&TaskQueueManagerPerfTest::ResetAndCallTestDelayedTask,
 159                        base::Unretained(this), 10000));
 160 }
 161
 162 TEST_F(TaskQueueManagerPerfTest, RunTenThousandDelayedTasks_EightQueues) {
 163   Initialize(8u);
 164
 165   max_tasks_in_flight_ = 200;
 166   Benchmark("run 10000 delayed tasks with eight queues",
 167             base::Bind(&TaskQueueManagerPerfTest::ResetAndCallTestDelayedTask,
 168                        base::Unretained(this), 10000));
 169 }
 170
 171 // TODO(alexclarke): Add additional tests with different mixes of non-delayed vs
 172 // delayed tasks.
 173
 174 }  // namespace content