qt5base-lts/tests/auto/qobjectperformance/tst_qobjectperformance.cpp

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the test suite of the Qt Toolkit.
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** contained in the Technology Preview License Agreement accompanying
** this package.
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#include <QtTest/QtTest>
#include <qcoreapplication.h>
#include <qobject.h>
//TESTED_CLASS=
//TESTED_FILES=corelib/kernel/qobject.h corelib/kernel/qobject.cpp
class tst_QObjectPerformance : public QObject
{
Q_OBJECT
public:
private slots:
void emitToManyReceivers();
};
class SimpleSenderObject : public QObject
{
Q_OBJECT
signals:
void signal();
public:
void emitSignal()
{
emit signal();
}
};
class SimpleReceiverObject : public QObject
{
Q_OBJECT
public slots:
void slot()
{
}
};
void tst_QObjectPerformance::emitToManyReceivers()
{
// ensure that emission times remain mostly linear as the number of receivers increase
SimpleSenderObject sender;
int elapsed = 0;
const int increase = 3000;
const int base = 5000;
for (int i = 0; i < 4; ++i) {
const int size = base + i * increase;
const double increaseRatio = double(size) / (double)(size - increase);
QList<SimpleReceiverObject *> receivers;
for (int k = 0; k < size; ++k) {
SimpleReceiverObject *receiver = new SimpleReceiverObject;
QObject::connect(&sender, SIGNAL(signal()), receiver, SLOT(slot()));
receivers.append(receiver);
}
QTime timer;
timer.start();
sender.emitSignal();
int e = timer.elapsed();
if (elapsed > 1) {
qDebug() << size << "receivers, elapsed time" << e << "compared to previous time" << elapsed;
QVERIFY(double(e) / double(elapsed) <= increaseRatio * 2.0);
} else {
qDebug() << size << "receivers, elapsed time" << e << "cannot be compared to previous, unmeasurable time";
}
elapsed = e;
qDeleteAll(receivers);
receivers.clear();
}
}
QTEST_MAIN(tst_QObjectPerformance)
#include "tst_qobjectperformance.moc"