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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/timer.h"
#include <memory>
#include "base/logging.h"
#include "base/run_loop.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/scheduler/test/renderer_scheduler_test_support.h"
#include "third_party/blink/renderer/platform/testing/task_environment.h"
#include "third_party/blink/renderer/platform/testing/unit_test_helpers.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class TimerPerfTest : public testing::Test {
public:
void NopTask(TimerBase*) {}
void RecordStartRunTime(TimerBase*) { run_start_ = base::ThreadTicks::Now(); }
void RecordEndRunTime(TimerBase*) {
run_end_ = base::ThreadTicks::Now();
loop_.Quit();
}
void Run() { loop_.Run(); }
test::TaskEnvironment task_environment_;
base::ThreadTicks run_start_;
base::ThreadTicks run_end_;
base::RunLoop loop_;
};
TEST_F(TimerPerfTest, PostAndRunTimers) {
const int kNumIterations = 10000;
Vector<std::unique_ptr<TaskRunnerTimer<TimerPerfTest>>> timers(
kNumIterations);
for (int i = 0; i < kNumIterations; i++) {
timers[i] = std::make_unique<TaskRunnerTimer<TimerPerfTest>>(
scheduler::GetSingleThreadTaskRunnerForTesting(), this,
&TimerPerfTest::NopTask);
}
TaskRunnerTimer<TimerPerfTest> measure_run_start(
scheduler::GetSingleThreadTaskRunnerForTesting(), this,
&TimerPerfTest::RecordStartRunTime);
TaskRunnerTimer<TimerPerfTest> measure_run_end(
scheduler::GetSingleThreadTaskRunnerForTesting(), this,
&TimerPerfTest::RecordEndRunTime);
measure_run_start.StartOneShot(base::TimeDelta(), FROM_HERE);
base::ThreadTicks post_start = base::ThreadTicks::Now();
for (int i = 0; i < kNumIterations; i++) {
timers[i]->StartOneShot(base::TimeDelta(), FROM_HERE);
}
base::ThreadTicks post_end = base::ThreadTicks::Now();
measure_run_end.StartOneShot(base::TimeDelta(), FROM_HERE);
Run();
double posting_time = (post_end - post_start).InMicrosecondsF();
double posting_time_us_per_call =
posting_time / static_cast<double>(kNumIterations);
LOG(INFO) << "TimerBase::startOneShot cost (us/call) "
<< posting_time_us_per_call << " (total " << posting_time << " us)";
LOG(INFO) << "Time to run " << kNumIterations << " trivial tasks (us) "
<< (run_end_ - run_start_).InMicroseconds();
}
TEST_F(TimerPerfTest, PostThenCancelTenThousandTimers) {
const int kNumIterations = 10000;
Vector<std::unique_ptr<TaskRunnerTimer<TimerPerfTest>>> timers(
kNumIterations);
for (int i = 0; i < kNumIterations; i++) {
timers[i] = std::make_unique<TaskRunnerTimer<TimerPerfTest>>(
scheduler::GetSingleThreadTaskRunnerForTesting(), this,
&TimerPerfTest::NopTask);
}
TaskRunnerTimer<TimerPerfTest> measure_run_start(
scheduler::GetSingleThreadTaskRunnerForTesting(), this,
&TimerPerfTest::RecordStartRunTime);
TaskRunnerTimer<TimerPerfTest> measure_run_end(
scheduler::GetSingleThreadTaskRunnerForTesting(), this,
&TimerPerfTest::RecordEndRunTime);
measure_run_start.StartOneShot(base::TimeDelta(), FROM_HERE);
base::ThreadTicks post_start = base::ThreadTicks::Now();
for (int i = 0; i < kNumIterations; i++) {
timers[i]->StartOneShot(base::TimeDelta(), FROM_HERE);
}
base::ThreadTicks post_end = base::ThreadTicks::Now();
measure_run_end.StartOneShot(base::TimeDelta(), FROM_HERE);
base::ThreadTicks cancel_start = base::ThreadTicks::Now();
for (int i = 0; i < kNumIterations; i++) {
timers[i]->Stop();
}
base::ThreadTicks cancel_end = base::ThreadTicks::Now();
Run();
double posting_time = (post_end - post_start).InMicrosecondsF();
double posting_time_us_per_call =
posting_time / static_cast<double>(kNumIterations);
LOG(INFO) << "TimerBase::startOneShot cost (us/call) "
<< posting_time_us_per_call << " (total " << posting_time << " us)";
double cancel_time = (cancel_end - cancel_start).InMicrosecondsF();
double cancel_time_us_per_call =
cancel_time / static_cast<double>(kNumIterations);
LOG(INFO) << "TimerBase::stop cost (us/call) " << cancel_time_us_per_call
<< " (total " << cancel_time << " us)";
LOG(INFO) << "Time to run " << kNumIterations << " canceled tasks (us) "
<< (run_end_ - run_start_).InMicroseconds();
}
} // namespace blink
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