132 lines
4.1 KiB
C++
132 lines
4.1 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/observer_list.h"
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#include <memory>
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#include "base/logging.h"
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#include "base/observer_list.h"
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#include "base/strings/stringprintf.h"
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#include "base/time/time.h"
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#include "testing/gtest/include/gtest/gtest.h"
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#include "testing/perf/perf_result_reporter.h"
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// Ask the compiler not to use a register for this counter, in case it decides
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// to do magic optimizations like |counter += kLaps|.
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volatile int g_observer_list_perf_test_counter;
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namespace base {
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constexpr char kMetricPrefixObserverList[] = "ObserverList.";
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constexpr char kMetricNotifyTimePerObserver[] = "notify_time_per_observer";
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namespace {
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perf_test::PerfResultReporter SetUpReporter(const std::string& story_name) {
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perf_test::PerfResultReporter reporter(kMetricPrefixObserverList, story_name);
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reporter.RegisterImportantMetric(kMetricNotifyTimePerObserver, "ns");
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return reporter;
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}
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} // namespace
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class ObserverInterface {
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public:
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ObserverInterface() {}
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virtual ~ObserverInterface() {}
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virtual void Observe() const { ++g_observer_list_perf_test_counter; }
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private:
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DISALLOW_COPY_AND_ASSIGN(ObserverInterface);
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};
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class UnsafeObserver : public ObserverInterface {};
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class TestCheckedObserver : public CheckedObserver, public ObserverInterface {};
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template <class ObserverType>
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struct Pick {
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// The ObserverList type to use. Checked observers need to be in a checked
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// ObserverList.
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using ObserverListType = ObserverList<ObserverType>;
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static const char* GetName() { return "CheckedObserver"; }
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};
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template <>
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struct Pick<UnsafeObserver> {
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using ObserverListType = ObserverList<ObserverInterface>::Unchecked;
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static const char* GetName() { return "UnsafeObserver"; }
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};
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template <class ObserverType>
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class ObserverListPerfTest : public ::testing::Test {
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public:
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using ObserverListType = typename Pick<ObserverType>::ObserverListType;
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ObserverListPerfTest() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(ObserverListPerfTest);
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};
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typedef ::testing::Types<UnsafeObserver, TestCheckedObserver> ObserverTypes;
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TYPED_TEST_SUITE(ObserverListPerfTest, ObserverTypes);
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// Performance test for base::ObserverList and Checked Observers.
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TYPED_TEST(ObserverListPerfTest, NotifyPerformance) {
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constexpr int kMaxObservers = 128;
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#if DCHECK_IS_ON()
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// The test takes about 100x longer in debug builds, mostly due to sequence
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// checker overheads when WeakPtr gets involved.
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constexpr int kLaps = 1000000;
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#else
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constexpr int kLaps = 100000000;
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#endif
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constexpr int kWarmupLaps = 100;
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std::vector<std::unique_ptr<TypeParam>> observers;
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for (int observer_count = 0; observer_count <= kMaxObservers;
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observer_count = observer_count ? observer_count * 2 : 1) {
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typename TestFixture::ObserverListType list;
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for (int i = 0; i < observer_count; ++i)
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observers.push_back(std::make_unique<TypeParam>());
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for (auto& o : observers)
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list.AddObserver(o.get());
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for (int i = 0; i < kWarmupLaps; ++i) {
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for (auto& o : list)
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o.Observe();
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}
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g_observer_list_perf_test_counter = 0;
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const int weighted_laps = kLaps / (observer_count + 1);
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TimeTicks start = TimeTicks::Now();
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for (int i = 0; i < weighted_laps; ++i) {
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for (auto& o : list)
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o.Observe();
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}
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TimeDelta duration = TimeTicks::Now() - start;
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observers.clear();
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EXPECT_EQ(observer_count * weighted_laps,
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g_observer_list_perf_test_counter);
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EXPECT_TRUE(observer_count == 0 || list.might_have_observers());
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std::string story_name =
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base::StringPrintf("%s_%d", Pick<TypeParam>::GetName(), observer_count);
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// A typical value is 3-20 nanoseconds per observe in Release, 1000-2000ns
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// in an optimized build with DCHECKs and 3000-6000ns in debug builds.
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auto reporter = SetUpReporter(story_name);
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reporter.AddResult(
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kMetricNotifyTimePerObserver,
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duration.InNanoseconds() /
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static_cast<double>(g_observer_list_perf_test_counter +
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weighted_laps));
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}
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}
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} // namespace base
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