1 files changed, 87 insertions, 0 deletions
diff --git a/tests/benchmarks/corelib/mimetypes/qmimedatabase/tst_bench_qmimedatabase.cpp b/tests/benchmarks/corelib/mimetypes/qmimedatabase/tst_bench_qmimedatabase.cpp
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+++ b/tests/benchmarks/corelib/mimetypes/qmimedatabase/tst_bench_qmimedatabase.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QTest>
+#include <QMimeDatabase>
+
+class tst_QMimeDatabase: public QObject
+{
+
+    Q_OBJECT
+
+private slots:
+    void inheritsPerformance();
+    void benchMimeTypeForName();
+};
+
+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.
+}
+
+void tst_QMimeDatabase::benchMimeTypeForName()
+{
+    QMimeDatabase db;
+
+    QBENCHMARK {
+        const auto s = db.mimeTypeForName(QStringLiteral("text/plain"));
+        QVERIFY(s.isValid());
+    }
+}
+
+QTEST_MAIN(tst_QMimeDatabase)
+
+#include "tst_bench_qmimedatabase.moc"