1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtTest/QtTest>
class tst_QMimeDatabase: public QObject
{
Q_OBJECT
private slots:
void inheritsPerformance();
};
void tst_QMimeDatabase::inheritsPerformance()
{
// Check performance of inherits().
// This benchmark (which started in 2009 in kmimetypetest.cpp) uses 40 mimetypes.
QStringList mimeTypes;
mimeTypes << QLatin1String("image/jpeg") << QLatin1String("image/png") << QLatin1String("image/tiff") << QLatin1String("text/plain") << QLatin1String("text/html");
mimeTypes += mimeTypes;
mimeTypes += mimeTypes;
mimeTypes += mimeTypes;
QCOMPARE(mimeTypes.count(), 40);
QMimeDatabase db;
QMimeType mime = db.mimeTypeForName(QString::fromLatin1("text/x-chdr"));
QVERIFY(mime.isValid());
QBENCHMARK {
QString match;
foreach (const QString &mt, mimeTypes) {
if (mime.inherits(mt)) {
match = mt;
// of course there would normally be a "break" here, but we're testing worse-case
// performance here
}
}
QCOMPARE(match, QString::fromLatin1("text/plain"));
}
// Numbers from 2011, in release mode:
// KDE 4.7 numbers: 0.21 msec / 494,000 ticks / 568,345 instr. loads per iteration
// QMimeBinaryProvider (with Qt 5): 0.16 msec / NA / 416,049 instr. reads per iteration
// QMimeXmlProvider (with Qt 5): 0.062 msec / NA / 172,889 instr. reads per iteration
// (but the startup time is way higher)
// And memory usage is flat at 200K with QMimeBinaryProvider, while it peaks at 6 MB when
// parsing XML, and then keeps being around 4.5 MB for all the in-memory hashes.
}
QTEST_MAIN(tst_QMimeDatabase)
#include "main.moc"
|
