|
1 /**************************************************************************** |
|
2 ** |
|
3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
|
4 ** All rights reserved. |
|
5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
|
6 ** |
|
7 ** This file is part of the test suite of the Qt Toolkit. |
|
8 ** |
|
9 ** $QT_BEGIN_LICENSE:LGPL$ |
|
10 ** No Commercial Usage |
|
11 ** This file contains pre-release code and may not be distributed. |
|
12 ** You may use this file in accordance with the terms and conditions |
|
13 ** contained in the Technology Preview License Agreement accompanying |
|
14 ** this package. |
|
15 ** |
|
16 ** GNU Lesser General Public License Usage |
|
17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
|
18 ** General Public License version 2.1 as published by the Free Software |
|
19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
|
20 ** packaging of this file. Please review the following information to |
|
21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
|
22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
|
23 ** |
|
24 ** In addition, as a special exception, Nokia gives you certain additional |
|
25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
|
26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
|
27 ** |
|
28 ** If you have questions regarding the use of this file, please contact |
|
29 ** Nokia at qt-info@nokia.com. |
|
30 ** |
|
31 ** |
|
32 ** |
|
33 ** |
|
34 ** |
|
35 ** |
|
36 ** |
|
37 ** |
|
38 ** $QT_END_LICENSE$ |
|
39 ** |
|
40 ****************************************************************************/ |
|
41 |
|
42 |
|
43 #include <QtTest/QtTest> |
|
44 |
|
45 #include <qcoreapplication.h> |
|
46 |
|
47 #include <qobject.h> |
|
48 |
|
49 //TESTED_CLASS= |
|
50 //TESTED_FILES=corelib/kernel/qobject.h corelib/kernel/qobject.cpp |
|
51 |
|
52 class tst_QObjectPerformance : public QObject |
|
53 { |
|
54 Q_OBJECT |
|
55 |
|
56 public: |
|
57 |
|
58 private slots: |
|
59 void emitToManyReceivers(); |
|
60 }; |
|
61 |
|
62 class SimpleSenderObject : public QObject |
|
63 { |
|
64 Q_OBJECT |
|
65 |
|
66 signals: |
|
67 void signal(); |
|
68 |
|
69 public: |
|
70 void emitSignal() |
|
71 { |
|
72 emit signal(); |
|
73 } |
|
74 }; |
|
75 |
|
76 class SimpleReceiverObject : public QObject |
|
77 { |
|
78 Q_OBJECT |
|
79 |
|
80 public slots: |
|
81 void slot() |
|
82 { |
|
83 } |
|
84 }; |
|
85 |
|
86 void tst_QObjectPerformance::emitToManyReceivers() |
|
87 { |
|
88 // ensure that emission times remain mostly linear as the number of receivers increase |
|
89 |
|
90 SimpleSenderObject sender; |
|
91 int elapsed = 0; |
|
92 const int increase = 3000; |
|
93 const int base = 5000; |
|
94 |
|
95 for (int i = 0; i < 4; ++i) { |
|
96 const int size = base + i * increase; |
|
97 const double increaseRatio = double(size) / (double)(size - increase); |
|
98 |
|
99 QList<SimpleReceiverObject *> receivers; |
|
100 for (int k = 0; k < size; ++k) { |
|
101 SimpleReceiverObject *receiver = new SimpleReceiverObject; |
|
102 QObject::connect(&sender, SIGNAL(signal()), receiver, SLOT(slot())); |
|
103 receivers.append(receiver); |
|
104 } |
|
105 |
|
106 QTime timer; |
|
107 timer.start(); |
|
108 sender.emitSignal(); |
|
109 int e = timer.elapsed(); |
|
110 |
|
111 if (elapsed > 1) { |
|
112 qDebug() << size << "receivers, elapsed time" << e << "compared to previous time" << elapsed; |
|
113 QVERIFY(double(e) / double(elapsed) <= increaseRatio * 2.0); |
|
114 } else { |
|
115 qDebug() << size << "receivers, elapsed time" << e << "cannot be compared to previous, unmeasurable time"; |
|
116 } |
|
117 elapsed = e; |
|
118 |
|
119 qDeleteAll(receivers); |
|
120 receivers.clear(); |
|
121 } |
|
122 } |
|
123 |
|
124 |
|
125 QTEST_MAIN(tst_QObjectPerformance) |
|
126 #include "tst_qobjectperformance.moc" |