Add a benchmark for QSharedPointer
Initial results with GCC: Even though GCC's assembly looks rather bad because of the implicit fall-back from atomics to non-atomics for single-threaded applications, libstdc++'s shared_ptr still performs twice as fast as QSharedPointer, proving that the branch predictor eats libstdc++'s is-multi-threaded-check for breakfast and the two atomic operations of a QSharedPointer copy vs. one for std::shared_ptr dominate the run-time. ********* Start testing of tst_QSharedPointer ********* Config: Using QtTest library 6.2.0, Qt 6.2.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 11.1.1 20210712), ubuntu 20.04 PASS : tst_QSharedPointer::initTestCase() PASS : tst_QSharedPointer::refAndDeref_null_QSP_int() RESULT : tst_QSharedPointer::refAndDeref_null_QSP_int(): 0.0000024 msecs per iteration (total: 81, iterations: 33554432) PASS : tst_QSharedPointer::refAndDeref_null_SSP_int() RESULT : tst_QSharedPointer::refAndDeref_null_SSP_int(): 0.0000024 msecs per iteration (total: 81, iterations: 33554432) PASS : tst_QSharedPointer::refAndDeref_null_BSP_int() RESULT : tst_QSharedPointer::refAndDeref_null_BSP_int(): 0.0000025 msecs per iteration (total: 87, iterations: 33554432) PASS : tst_QSharedPointer::refAndDeref_null_QSP_QString() RESULT : tst_QSharedPointer::refAndDeref_null_QSP_QString(): 0.0000025 msecs per iteration (total: 86, iterations: 33554432) PASS : tst_QSharedPointer::refAndDeref_null_SSP_QString() RESULT : tst_QSharedPointer::refAndDeref_null_SSP_QString(): 0.0000023 msecs per iteration (total: 80, iterations: 33554432) PASS : tst_QSharedPointer::refAndDeref_null_BSP_QString() RESULT : tst_QSharedPointer::refAndDeref_null_BSP_QString(): 0.0000026 msecs per iteration (total: 88, iterations: 33554432) PASS : tst_QSharedPointer::refAndDeref_nonnull_QSP_int() RESULT : tst_QSharedPointer::refAndDeref_nonnull_QSP_int(): 0.000019 msecs per iteration (total: 83, iterations: 4194304) PASS : tst_QSharedPointer::refAndDeref_nonnull_SSP_int() RESULT : tst_QSharedPointer::refAndDeref_nonnull_SSP_int(): 0.000010 msecs per iteration (total: 90, iterations: 8388608) PASS : tst_QSharedPointer::refAndDeref_nonnull_BSP_int() RESULT : tst_QSharedPointer::refAndDeref_nonnull_BSP_int(): 0.0000094 msecs per iteration (total: 79, iterations: 8388608) PASS : tst_QSharedPointer::refAndDeref_nonnull_QSP_QString() RESULT : tst_QSharedPointer::refAndDeref_nonnull_QSP_QString(): 0.000017 msecs per iteration (total: 75, iterations: 4194304) PASS : tst_QSharedPointer::refAndDeref_nonnull_SSP_QString() RESULT : tst_QSharedPointer::refAndDeref_nonnull_SSP_QString(): 0.000010 msecs per iteration (total: 90, iterations: 8388608) PASS : tst_QSharedPointer::refAndDeref_nonnull_BSP_QString() RESULT : tst_QSharedPointer::refAndDeref_nonnull_BSP_QString(): 0.0000091 msecs per iteration (total: 77, iterations: 8388608) PASS : tst_QSharedPointer::threadedRefAndDeref_null_QSP_int() RESULT : tst_QSharedPointer::threadedRefAndDeref_null_QSP_int(): 0.000016 msecs per iteration (total: 68, iterations: 4194304) PASS : tst_QSharedPointer::threadedRefAndDeref_null_SSP_int() RESULT : tst_QSharedPointer::threadedRefAndDeref_null_SSP_int(): 0.000025 msecs per iteration (total: 53, iterations: 2097152) PASS : tst_QSharedPointer::threadedRefAndDeref_null_BSP_int() RESULT : tst_QSharedPointer::threadedRefAndDeref_null_BSP_int(): 0.000027 msecs per iteration (total: 58, iterations: 2097152) PASS : tst_QSharedPointer::threadedRefAndDeref_null_QSP_QString() RESULT : tst_QSharedPointer::threadedRefAndDeref_null_QSP_QString(): 0.000016 msecs per iteration (total: 71, iterations: 4194304) PASS : tst_QSharedPointer::threadedRefAndDeref_null_SSP_QString() RESULT : tst_QSharedPointer::threadedRefAndDeref_null_SSP_QString(): 0.000027 msecs per iteration (total: 58, iterations: 2097152) PASS : tst_QSharedPointer::threadedRefAndDeref_null_BSP_QString() RESULT : tst_QSharedPointer::threadedRefAndDeref_null_BSP_QString(): 0.000017 msecs per iteration (total: 73, iterations: 4194304) PASS : tst_QSharedPointer::threadedRefAndDeref_nonnull_QSP_int() RESULT : tst_QSharedPointer::threadedRefAndDeref_nonnull_QSP_int(): 0.00073 msecs per iteration (total: 96, iterations: 131072) PASS : tst_QSharedPointer::threadedRefAndDeref_nonnull_SSP_int() RESULT : tst_QSharedPointer::threadedRefAndDeref_nonnull_SSP_int(): 0.000408 msecs per iteration (total: 107, iterations: 262144) PASS : tst_QSharedPointer::threadedRefAndDeref_nonnull_BSP_int() RESULT : tst_QSharedPointer::threadedRefAndDeref_nonnull_BSP_int(): 0.00033 msecs per iteration (total: 89, iterations: 262144) PASS : tst_QSharedPointer::threadedRefAndDeref_nonnull_QSP_QString() RESULT : tst_QSharedPointer::threadedRefAndDeref_nonnull_QSP_QString(): 0.000877 msecs per iteration (total: 115, iterations: 131072) PASS : tst_QSharedPointer::threadedRefAndDeref_nonnull_SSP_QString() RESULT : tst_QSharedPointer::threadedRefAndDeref_nonnull_SSP_QString(): 0.00033 msecs per iteration (total: 89, iterations: 262144) PASS : tst_QSharedPointer::threadedRefAndDeref_nonnull_BSP_QString() RESULT : tst_QSharedPointer::threadedRefAndDeref_nonnull_BSP_QString(): 0.000385 msecs per iteration (total: 101, iterations: 262144) PASS : tst_QSharedPointer::cleanupTestCase() Totals: 26 passed, 0 failed, 0 skipped, 0 blacklisted, 7995ms ********* Finished testing of tst_QSharedPointer ********* Change-Id: I0bed70142ffdbde6898ec0e27cb470b50fc0e97d Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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@ -8,5 +8,6 @@ add_subdirectory(qlist)
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add_subdirectory(qmap)
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add_subdirectory(qrect)
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add_subdirectory(qringbuffer)
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add_subdirectory(qsharedpointer)
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add_subdirectory(qstack)
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add_subdirectory(qvector)
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@ -0,0 +1,9 @@
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qt_internal_add_benchmark(tst_bench_shared_ptr
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SOURCES
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tst_bench_shared_ptr.cpp
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INCLUDE_DIRECTORIES
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.
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PUBLIC_LIBRARIES
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Qt::Core
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Qt::Test
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)
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@ -0,0 +1,123 @@
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/****************************************************************************
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**
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** Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QObject>
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#include <QScopeGuard>
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#include <QSharedPointer>
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#include <QTest>
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#include <atomic>
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#include <memory>
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#include <thread>
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#include <vector>
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#if __has_include(<boost/shared_ptr.hpp>)
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# include <boost/shared_ptr.hpp>
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# include <boost/make_shared.hpp>
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# define ONLY_IF_BOOST(x) x
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#else
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# define ONLY_IF_BOOST(x) QSKIP("This benchmark requires Boost.SharedPtr.")
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#endif
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class tst_QSharedPointer : public QObject
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{
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Q_OBJECT
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private Q_SLOTS:
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void refAndDeref_null_QSP_int() { refAndDeref<QSharedPointer<int>>(); }
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void refAndDeref_null_SSP_int() { refAndDeref<std::shared_ptr<int>>(); }
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void refAndDeref_null_BSP_int() { ONLY_IF_BOOST(refAndDeref<boost::shared_ptr<int>>()); }
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void refAndDeref_null_QSP_QString() { refAndDeref<QSharedPointer<QString>>(); }
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void refAndDeref_null_SSP_QString() { refAndDeref<std::shared_ptr<QString>>(); }
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void refAndDeref_null_BSP_QString() { ONLY_IF_BOOST(refAndDeref<boost::shared_ptr<QString>>()); }
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void refAndDeref_nonnull_QSP_int() { refAndDeref(QSharedPointer<int>::create(42)); }
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void refAndDeref_nonnull_SSP_int() { refAndDeref(std::make_shared<int>(42)); }
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void refAndDeref_nonnull_BSP_int() { ONLY_IF_BOOST(refAndDeref(boost::make_shared<int>(42))); }
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void refAndDeref_nonnull_QSP_QString() { refAndDeref(QSharedPointer<QString>::create(QStringLiteral("Hello"))); }
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void refAndDeref_nonnull_SSP_QString() { refAndDeref(std::make_shared<QString>(QStringLiteral("Hello"))); }
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void refAndDeref_nonnull_BSP_QString() { ONLY_IF_BOOST(refAndDeref(boost::make_shared<QString>(QStringLiteral("Hello")))); }
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private:
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template <typename SP>
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void refAndDeref(SP sp = {})
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{
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QBENCHMARK {
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[[maybe_unused]] auto copy = sp;
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}
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}
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private Q_SLOTS:
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void threadedRefAndDeref_null_QSP_int() { threadedRefAndDeref<QSharedPointer<int>>(); }
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void threadedRefAndDeref_null_SSP_int() { threadedRefAndDeref<std::shared_ptr<int>>(); }
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void threadedRefAndDeref_null_BSP_int() { ONLY_IF_BOOST(threadedRefAndDeref<boost::shared_ptr<int>>()); }
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void threadedRefAndDeref_null_QSP_QString() { threadedRefAndDeref<QSharedPointer<QString>>(); }
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void threadedRefAndDeref_null_SSP_QString() { threadedRefAndDeref<std::shared_ptr<QString>>(); }
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void threadedRefAndDeref_null_BSP_QString() { ONLY_IF_BOOST(threadedRefAndDeref<boost::shared_ptr<QString>>()); }
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void threadedRefAndDeref_nonnull_QSP_int() { threadedRefAndDeref(QSharedPointer<int>::create(42)); }
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void threadedRefAndDeref_nonnull_SSP_int() { threadedRefAndDeref(std::make_shared<int>(42)); }
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void threadedRefAndDeref_nonnull_BSP_int() { ONLY_IF_BOOST(threadedRefAndDeref(boost::make_shared<int>(42))); }
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void threadedRefAndDeref_nonnull_QSP_QString() { threadedRefAndDeref(QSharedPointer<QString>::create(QStringLiteral("Hello"))); }
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void threadedRefAndDeref_nonnull_SSP_QString() { threadedRefAndDeref(std::make_shared<QString>(QStringLiteral("Hello"))); }
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void threadedRefAndDeref_nonnull_BSP_QString() { ONLY_IF_BOOST(threadedRefAndDeref(boost::make_shared<QString>(QStringLiteral("Hello")))); }
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private:
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template <typename SP>
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void threadedRefAndDeref(SP sp = {})
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{
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std::atomic<bool> cancel = false;
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std::vector<std::thread> threads;
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const auto numCores = std::max(2U, std::thread::hardware_concurrency());
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for (uint i = 0; i < numCores - 1; ++i) {
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threads.emplace_back([sp, &cancel] {
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while (!cancel.load(std::memory_order_relaxed)) {
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for (int i = 0; i < 100; ++i)
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[[maybe_unused]] auto copy = sp;
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}
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});
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}
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const auto join = qScopeGuard([&] {
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cancel.store(true, std::memory_order_relaxed);
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for (auto &t : threads)
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t.join();
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});
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QBENCHMARK {
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[[maybe_unused]] auto copy = sp;
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}
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}
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};
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QTEST_MAIN(tst_QSharedPointer)
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#include "tst_bench_shared_ptr.moc"
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