9ceb3b4f6f
The qobjectperformance test is a kind of performance test that asserts that the time it takes to emit a signal to a certain number of receivers does not exceed a certain time. other/ currently seems to be a sensible place for such a test. Alternatively, it could have been put next to corelib/kernel/qobject/. Change-Id: I5c9461b62984f5806d1f6940123d30ef9f9f5a37 Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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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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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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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 General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtTest/QtTest>
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#include <qcoreapplication.h>
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#include <qobject.h>
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//TESTED_CLASS=
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//TESTED_FILES=corelib/kernel/qobject.h corelib/kernel/qobject.cpp
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class tst_QObjectPerformance : public QObject
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{
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Q_OBJECT
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public:
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private slots:
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void emitToManyReceivers();
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};
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class SimpleSenderObject : public QObject
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{
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Q_OBJECT
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signals:
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void signal();
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public:
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void emitSignal()
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{
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emit signal();
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}
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};
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class SimpleReceiverObject : public QObject
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{
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Q_OBJECT
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public slots:
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void slot()
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{
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}
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};
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void tst_QObjectPerformance::emitToManyReceivers()
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{
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// ensure that emission times remain mostly linear as the number of receivers increase
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SimpleSenderObject sender;
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int elapsed = 0;
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const int increase = 3000;
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const int base = 5000;
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for (int i = 0; i < 4; ++i) {
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const int size = base + i * increase;
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const double increaseRatio = double(size) / (double)(size - increase);
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QList<SimpleReceiverObject *> receivers;
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for (int k = 0; k < size; ++k) {
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SimpleReceiverObject *receiver = new SimpleReceiverObject;
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QObject::connect(&sender, SIGNAL(signal()), receiver, SLOT(slot()));
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receivers.append(receiver);
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}
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QTime timer;
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timer.start();
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sender.emitSignal();
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int e = timer.elapsed();
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if (elapsed > 1) {
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qDebug() << size << "receivers, elapsed time" << e << "compared to previous time" << elapsed;
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QVERIFY(double(e) / double(elapsed) <= increaseRatio * 2.0);
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} else {
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qDebug() << size << "receivers, elapsed time" << e << "cannot be compared to previous, unmeasurable time";
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}
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elapsed = e;
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qDeleteAll(receivers);
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receivers.clear();
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}
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}
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QTEST_MAIN(tst_QObjectPerformance)
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#include "tst_qobjectperformance.moc"
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