1 files changed, 87 insertions, 0 deletions
diff --git a/tests/benchmarks/corelib/mimetypes/qmimedatabase/main.cpp b/tests/benchmarks/corelib/mimetypes/qmimedatabase/main.cpp
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index 0000000000..4a4d25d201
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+++ b/tests/benchmarks/corelib/mimetypes/qmimedatabase/main.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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"