qt 6.5.1 original

tests/benchmarks/corelib/thread/qmutex/CMakeLists.txt

@@ -0,0 +1,14 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## tst_bench_qmutex Binary:
+#####################################################################
+
+qt_internal_add_benchmark(tst_bench_qmutex
+    SOURCES
+        tst_bench_qmutex.cpp
+    LIBRARIES
+        Qt::CorePrivate
+        Qt::Test
+)

tests/benchmarks/corelib/thread/qmutex/tst_bench_qmutex.cpp

@@ -0,0 +1,428 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtCore/QtCore>
+#include <QTest>
+#include <QtCore/private/qvolatile_p.h>
+
+#include <math.h>
+
+//#define USE_SEM_T
+
+#if defined(Q_OS_UNIX)
+#if !defined(USE_SEM_T)
+#  include <pthread.h>
+#  include <errno.h>
+typedef pthread_mutex_t NativeMutexType;
+void NativeMutexInitialize(NativeMutexType *mutex)
+{
+    pthread_mutex_init(mutex, NULL);
+}
+void NativeMutexDestroy(NativeMutexType *mutex)
+{
+    pthread_mutex_destroy(mutex);
+}
+void NativeMutexLock(NativeMutexType *mutex)
+{
+    pthread_mutex_lock(mutex);
+}
+void NativeMutexUnlock(NativeMutexType *mutex)
+{
+    pthread_mutex_unlock(mutex);
+}
+#else
+#  include <semaphore.h>
+typedef sem_t NativeMutexType;
+void NativeMutexInitialize(NativeMutexType *mutex)
+{
+    sem_init(mutex, false, 1);
+}
+void NativeMutexDestroy(NativeMutexType *mutex)
+{
+    sem_destroy(mutex);
+}
+void NativeMutexLock(NativeMutexType *mutex)
+{
+    sem_wait(mutex);
+}
+void NativeMutexUnlock(NativeMutexType *mutex)
+{
+    sem_post(mutex);
+}
+#endif
+#elif defined(Q_OS_WIN)
+#  include <qt_windows.h>
+typedef CRITICAL_SECTION NativeMutexType;
+void NativeMutexInitialize(NativeMutexType *mutex)
+{
+    InitializeCriticalSection(mutex);
+}
+void NativeMutexDestroy(NativeMutexType *mutex)
+{
+    DeleteCriticalSection(mutex);
+}
+void NativeMutexLock(NativeMutexType *mutex)
+{
+    EnterCriticalSection(mutex);
+}
+void NativeMutexUnlock(NativeMutexType *mutex)
+{
+    LeaveCriticalSection(mutex);
+}
+#endif
+
+class tst_QMutex : public QObject
+{
+    Q_OBJECT
+
+    int threadCount;
+
+public:
+    // barriers for the contended tests
+    static QSemaphore semaphore1, semaphore2, semaphore3, semaphore4;
+
+    tst_QMutex()
+    {
+        // at least 2 threads, even on single cpu/core machines
+        threadCount = qMax(2, QThread::idealThreadCount());
+        qDebug("thread count: %d", threadCount);
+    }
+
+private slots:
+    void noThread_data();
+    void noThread();
+
+    void constructionNative();
+    void uncontendedNative();
+    void constructionQMutex();
+    void uncontendedQMutex();
+    void uncontendedQMutexLocker();
+
+    void contendedNative_data();
+    void contendedQMutex_data() { contendedNative_data(); }
+    void contendedQMutexLocker_data() { contendedNative_data(); }
+
+    void contendedNative();
+    void contendedQMutex();
+    void contendedQMutexLocker();
+};
+
+QSemaphore tst_QMutex::semaphore1;
+QSemaphore tst_QMutex::semaphore2;
+QSemaphore tst_QMutex::semaphore3;
+QSemaphore tst_QMutex::semaphore4;
+
+void tst_QMutex::noThread_data()
+{
+    QTest::addColumn<int>("t");
+
+    QTest::newRow("noLock") << 1;
+    QTest::newRow("QMutex") << 3;
+    QTest::newRow("QMutexLocker") << 4;
+}
+
+void tst_QMutex::noThread()
+{
+    volatile int count = 0;
+    const int N = 5000000;
+    QMutex mtx;
+
+    QFETCH(int, t);
+    switch(t) {
+        case 1:
+            QBENCHMARK {
+                count = 0;
+                for (int i = 0; i < N; i++) {
+                    QtPrivate::volatilePreIncrement(count);
+                }
+            }
+            break;
+        case 3:
+            QBENCHMARK {
+                count = 0;
+                for (int i = 0; i < N; i++) {
+                    mtx.lock();
+                    QtPrivate::volatilePreIncrement(count);
+                    mtx.unlock();
+                }
+            }
+            break;
+        case 4:
+            QBENCHMARK {
+                count = 0;
+                for (int i = 0; i < N; i++) {
+                    QMutexLocker locker(&mtx);
+                    QtPrivate::volatilePreIncrement(count);
+                }
+            }
+            break;
+    }
+    QCOMPARE(int(count), N);
+}
+
+void tst_QMutex::constructionNative()
+{
+    QBENCHMARK {
+        NativeMutexType mutex;
+        NativeMutexInitialize(&mutex);
+        NativeMutexDestroy(&mutex);
+    }
+}
+
+void tst_QMutex::uncontendedNative()
+{
+    NativeMutexType mutex;
+    NativeMutexInitialize(&mutex);
+    QBENCHMARK {
+        NativeMutexLock(&mutex);
+        NativeMutexUnlock(&mutex);
+    }
+    NativeMutexDestroy(&mutex);
+}
+
+void tst_QMutex::constructionQMutex()
+{
+    QBENCHMARK {
+        QMutex mutex;
+        Q_UNUSED(mutex);
+    }
+}
+
+void tst_QMutex::uncontendedQMutex()
+{
+    QMutex mutex;
+    QBENCHMARK {
+        mutex.lock();
+        mutex.unlock();
+    }
+}
+
+void tst_QMutex::uncontendedQMutexLocker()
+{
+    QMutex mutex;
+    QBENCHMARK {
+        QMutexLocker locker(&mutex);
+    }
+}
+
+void tst_QMutex::contendedNative_data()
+{
+    QTest::addColumn<int>("iterations");
+    QTest::addColumn<int>("msleepDuration");
+    QTest::addColumn<bool>("use2mutexes");
+
+    QTest::newRow("baseline")               <<    0 <<  -1 << false;
+
+    QTest::newRow("no msleep, 1 mutex")     << 1000 <<  -1 << false;
+    QTest::newRow("no msleep, 2 mutexes")   << 1000 <<  -1 << true;
+    QTest::newRow("msleep(0), 1 mutex")     << 1000 <<   0 << false;
+    QTest::newRow("msleep(0), 2 mutexes")   << 1000 <<   0 << true;
+    QTest::newRow("msleep(1), 1 mutex")     <<   10 <<   1 << false;
+    QTest::newRow("msleep(1), 2 mutexes")   <<   10 <<   1 << true;
+    QTest::newRow("msleep(2), 1 mutex")     <<   10 <<   2 << false;
+    QTest::newRow("msleep(2), 2 mutexes")   <<   10 <<   2 << true;
+    QTest::newRow("msleep(10), 1 mutex")    <<   10 <<  10 << false;
+    QTest::newRow("msleep(10), 2 mutexes")  <<   10 <<  10 << true;
+}
+
+class NativeMutexThread : public QThread
+{
+    NativeMutexType *mutex1, *mutex2;
+    int iterations, msleepDuration;
+    bool use2mutexes;
+public:
+    bool done;
+    NativeMutexThread(NativeMutexType *mutex1, NativeMutexType *mutex2, int iterations, int msleepDuration, bool use2mutexes)
+        : mutex1(mutex1), mutex2(mutex2), iterations(iterations), msleepDuration(msleepDuration), use2mutexes(use2mutexes), done(false)
+    { }
+    void run() override
+    {
+        forever {
+            tst_QMutex::semaphore1.release();
+            tst_QMutex::semaphore2.acquire();
+            if (done)
+                break;
+            for (int i = 0; i < iterations; ++i) {
+                NativeMutexLock(mutex1);
+                if (use2mutexes)
+                    NativeMutexLock(mutex2);
+                if (msleepDuration >= 0)
+                    msleep(msleepDuration);
+                if (use2mutexes)
+                    NativeMutexUnlock(mutex2);
+                NativeMutexUnlock(mutex1);
+
+                QThread::yieldCurrentThread();
+            }
+            tst_QMutex::semaphore3.release();
+            tst_QMutex::semaphore4.acquire();
+        }
+    }
+};
+
+void tst_QMutex::contendedNative()
+{
+    QFETCH(int, iterations);
+    QFETCH(int, msleepDuration);
+    QFETCH(bool, use2mutexes);
+
+    NativeMutexType mutex1, mutex2;
+    NativeMutexInitialize(&mutex1);
+    NativeMutexInitialize(&mutex2);
+
+    QList<NativeMutexThread *> threads(threadCount);
+    for (int i = 0; i < threads.size(); ++i) {
+        threads[i] = new NativeMutexThread(&mutex1, &mutex2, iterations, msleepDuration, use2mutexes);
+        threads[i]->start();
+    }
+
+    QBENCHMARK {
+        semaphore1.acquire(threadCount);
+        semaphore2.release(threadCount);
+        semaphore3.acquire(threadCount);
+        semaphore4.release(threadCount);
+    }
+
+    for (int i = 0; i < threads.size(); ++i)
+        threads[i]->done = true;
+    semaphore1.acquire(threadCount);
+    semaphore2.release(threadCount);
+    for (int i = 0; i < threads.size(); ++i)
+        threads[i]->wait();
+    qDeleteAll(threads);
+
+    NativeMutexDestroy(&mutex1);
+    NativeMutexDestroy(&mutex2);
+}
+
+class QMutexThread : public QThread
+{
+    QMutex *mutex1, *mutex2;
+    int iterations, msleepDuration;
+    bool use2mutexes;
+public:
+    bool done;
+    QMutexThread(QMutex *mutex1, QMutex *mutex2, int iterations, int msleepDuration, bool use2mutexes)
+        : mutex1(mutex1), mutex2(mutex2), iterations(iterations), msleepDuration(msleepDuration), use2mutexes(use2mutexes), done(false)
+    { }
+    void run() override
+    {
+        forever {
+            tst_QMutex::semaphore1.release();
+            tst_QMutex::semaphore2.acquire();
+            if (done)
+                break;
+            for (int i = 0; i < iterations; ++i) {
+                mutex1->lock();
+                if (use2mutexes)
+                    mutex2->lock();
+                if (msleepDuration >= 0)
+                    msleep(msleepDuration);
+                if (use2mutexes)
+                    mutex2->unlock();
+                mutex1->unlock();
+
+                QThread::yieldCurrentThread();
+            }
+            tst_QMutex::semaphore3.release();
+            tst_QMutex::semaphore4.acquire();
+        }
+    }
+};
+
+void tst_QMutex::contendedQMutex()
+{
+    QFETCH(int, iterations);
+    QFETCH(int, msleepDuration);
+    QFETCH(bool, use2mutexes);
+
+    QMutex mutex1, mutex2;
+
+    QList<QMutexThread *> threads(threadCount);
+    for (int i = 0; i < threads.size(); ++i) {
+        threads[i] = new QMutexThread(&mutex1, &mutex2, iterations, msleepDuration, use2mutexes);
+        threads[i]->start();
+    }
+
+    QBENCHMARK {
+        semaphore1.acquire(threadCount);
+        semaphore2.release(threadCount);
+        semaphore3.acquire(threadCount);
+        semaphore4.release(threadCount);
+    }
+
+    for (int i = 0; i < threads.size(); ++i)
+        threads[i]->done = true;
+    semaphore1.acquire(threadCount);
+    semaphore2.release(threadCount);
+    for (int i = 0; i < threads.size(); ++i)
+        threads[i]->wait();
+    qDeleteAll(threads);
+}
+
+class QMutexLockerThread : public QThread
+{
+    QMutex *mutex1, *mutex2;
+    int iterations, msleepDuration;
+    bool use2mutexes;
+public:
+    bool done;
+    QMutexLockerThread(QMutex *mutex1, QMutex *mutex2, int iterations, int msleepDuration, bool use2mutexes)
+        : mutex1(mutex1), mutex2(mutex2), iterations(iterations), msleepDuration(msleepDuration), use2mutexes(use2mutexes), done(false)
+    { }
+    void run() override
+    {
+        forever {
+            tst_QMutex::semaphore1.release();
+            tst_QMutex::semaphore2.acquire();
+            if (done)
+                break;
+            for (int i = 0; i < iterations; ++i) {
+                {
+                    QMutexLocker locker1(mutex1);
+                    QMutexLocker locker2(use2mutexes ? mutex2 : 0);
+                    if (msleepDuration >= 0)
+                        msleep(msleepDuration);
+                }
+
+                QThread::yieldCurrentThread();
+            }
+            tst_QMutex::semaphore3.release();
+            tst_QMutex::semaphore4.acquire();
+        }
+    }
+};
+
+void tst_QMutex::contendedQMutexLocker()
+{
+    QFETCH(int, iterations);
+    QFETCH(int, msleepDuration);
+    QFETCH(bool, use2mutexes);
+
+    QMutex mutex1, mutex2;
+
+    QList<QMutexLockerThread *> threads(threadCount);
+    for (int i = 0; i < threads.size(); ++i) {
+        threads[i] = new QMutexLockerThread(&mutex1, &mutex2, iterations, msleepDuration, use2mutexes);
+        threads[i]->start();
+    }
+
+    QBENCHMARK {
+        semaphore1.acquire(threadCount);
+        semaphore2.release(threadCount);
+        semaphore3.acquire(threadCount);
+        semaphore4.release(threadCount);
+    }
+
+    for (int i = 0; i < threads.size(); ++i)
+        threads[i]->done = true;
+    semaphore1.acquire(threadCount);
+    semaphore2.release(threadCount);
+    for (int i = 0; i < threads.size(); ++i)
+        threads[i]->wait();
+    qDeleteAll(threads);
+}
+
+QTEST_MAIN(tst_QMutex)
+
+#include "tst_bench_qmutex.moc"