Differential D12746 Diff 33823 kdevplatform/language/duchain/tests/test_topcontextstore.cpp

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kdevplatform/language/duchain/tests/test_topcontextstore.cpp

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1​/*
2​ * This file is part of KDevelop
3​ *
4​ * Copyright 2018 R.J.V. Bertin <rjvbertin@gmail.com>
5​ *
6​ * This program is free software; you can redistribute it and/or modify
7​ * it under the terms of the GNU Library General Public License as
8​ * published by the Free Software Foundation; either version 2 of the
9​ * License, or (at your option) any later version.
10​ *
11​ * This program is distributed in the hope that it will be useful,
12​ * but WITHOUT ANY WARRANTY; without even the implied warranty of
13​ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14​ * GNU General Public License for more details.
15​ *
16​ * You should have received a copy of the GNU General Public
17​ * License along with this program; if not, write to the
18​ * Free Software Foundation, Inc.,
19​ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20​ */
21​
22​// with LMDB, the store is about 1.1x larger than the length of the stored values (but
23​// our LZ4 compression can reach as much as a 2x reduction in average value size).
24​// with KyotoCabinet-lzo, the store is about 1.76x smaller than the length of the stored values
25​
26​// timing results on Linux 4.14 running on an 1.6Ghz Intel N3150 and ZFSonLinux 0.7.6
27​
28​// KDEV_TOPCONTEXTS_USE_FILES:
29​// QINFO : TestTopDUContextStore::benchTopContextStore() 6000 items, max length= 38494 from sample of length 38497
30​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 115232709 total key bytes: 24000
31​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 6000 keys (last flushed): 1.583 seconds
32​// PASS : TestTopDUContextStore::benchTopContextStore()
33​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 6000 keys: 0.445 seconds
34​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
35​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 6000 keys: 0.736 seconds
36​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
37​// PASS : TestTopDUContextStore::cleanupTestCase()
38​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 3426ms
39​// ## Idem, with only 1500 keys
40​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38484 from sample of length 38497
41​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 28350833 total key bytes: 6000
42​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 0.351 seconds
43​// PASS : TestTopDUContextStore::benchTopContextStore()
44​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 0.092 seconds
45​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
46​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.232 seconds
47​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
48​// PASS : TestTopDUContextStore::cleanupTestCase()
49​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 1171ms
50​// ## idem, on NFS:
51​// QINFO : TestTopDUContextStore::benchTopContextStore() 6000 items, max length= 38488 from sample of length 38497
52​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 115800253 total key bytes: 24000
53​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 6000 keys (last flushed): 108.579 seconds
54​// PASS : TestTopDUContextStore::benchTopContextStore()
55​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 6000 keys: 50.502 seconds
56​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
57​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 6000 keys: 27.651 seconds
58​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
59​// PASS : TestTopDUContextStore::cleanupTestCase()
60​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 194162ms
61​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38462 from sample of length 38497
62​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 29375929 total key bytes: 6000
63​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 26.459 seconds
64​// PASS : TestTopDUContextStore::benchTopContextStore()
65​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 11.778 seconds
66​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
67​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 6.494 seconds
68​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
69​// PASS : TestTopDUContextStore::cleanupTestCase()
70​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 51921ms
71​// KDEV_TOPCONTEXTS_USE_LMDB:
72​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38424 from sample of length 38497
73​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 29024029 total key bytes: 6000
74​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 1.585 seconds
75​// PASS : TestTopDUContextStore::benchTopContextStore()
76​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 0.126 seconds
77​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
mwolffUnsubmitted
Done

you are missing the 6k results here

mwolff: you are missing the 6k results here
rjvbbAuthorUnsubmitted
Done

I can add them of course, but from what I've seen they scale in a nicely linear fashion. My initial tests with the file-based backend showed non-linear scaling there which has now all but disappeared so I could just as well remove the 6k results, probably.

rjvbb: I can add them of course, but from what I've seen they scale in a nicely linear fashion. My…
78​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.517 seconds
79​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
80​// QINFO : TestTopDUContextStore::benchTopContextStoreFlush() Flushing the database to disk: 0.656 seconds
81​// PASS : TestTopDUContextStore::benchTopContextStoreFlush()
82​// total 14M
83​// 512 -rw-r--r-- 1 bertin bertin 8.0K May 8 14:19 lock.mdb
84​// 14M -rw-r--r-- 1 bertin bertin 27M May 8 14:19 data.mdb
85​// PASS : TestTopDUContextStore::cleanupTestCase()
86​// Totals: 22 passed, 0 failed, 0 skipped, 0 blacklisted, 18941ms
87​// ********* Finished testing of TestTopDUContextStore *********
88​// average LZ4 compression ratio: 1.95162; 1501 compressed of 3000
89​// ## idem, on NFS:
90​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38496 from sample of length 38497
91​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 29311234 total key bytes: 6000
92​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 12.362 seconds
93​// PASS : TestTopDUContextStore::benchTopContextStore()
94​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 0.113 seconds
95​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
96​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.221 seconds
97​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
98​// QINFO : TestTopDUContextStore::benchTopContextStoreFlush() Flushing the database to disk: 8.763 seconds
99​// PASS : TestTopDUContextStore::benchTopContextStoreFlush()
100​// total 26M
101​// 8.0K -rw-r--r-- 1 bertin bertin 8.0K May 8 2018 lock.mdb
102​// 26M -rw-r--r-- 1 bertin bertin 26M May 8 2018 data.mdb
103​// PASS : TestTopDUContextStore::cleanupTestCase()
104​// Totals: 22 passed, 0 failed, 0 skipped, 0 blacklisted, 91060ms
105​// ********* Finished testing of TestTopDUContextStore *********
106​// average LZ4 compression ratio: 1.95829; 1499 compressed of 3000
107​// KDEV_TOPCONTEXTS_USE_KYOTO:
108​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38467 from sample of length 38497
109​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 29759286 total key bytes: 6000
110​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 7.891 seconds
111​// PASS : TestTopDUContextStore::benchTopContextStore()
112​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 6.139 seconds
113​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
114​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.212 seconds
115​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
116​// PASS : TestTopDUContextStore::cleanupTestCase()
117​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 37116ms
118​// ## idem, on NFS:
119​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38468 from sample of length 38497
120​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 28638008 total key bytes: 6000
121​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 27.135 seconds
122​// PASS : TestTopDUContextStore::benchTopContextStore()
123​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 17.317 seconds
124​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
125​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.218 seconds
126​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
127​// PASS : TestTopDUContextStore::cleanupTestCase()
128​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 180553ms
129​
130​// ## on a 2.7Ghz i7 running Mac OS X 10.9.5
131​// KDEV_TOPCONTEXTS_USE_FILES:
132​// QINFO : TestTopDUContextStore::benchTopContextStore() 6000 items, max length= 38495 from sample of length 38497
133​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 115547442 total key bytes: 24000
134​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 6000 keys (last flushed): 1.622 seconds
135​// PASS : TestTopDUContextStore::benchTopContextStore()
136​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 6000 keys: 0.13 seconds
137​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
138​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 6000 keys: 0.924 seconds
139​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
140​// PASS : TestTopDUContextStore::cleanupTestCase()
141​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 8829ms
142​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38463 from sample of length 38497
143​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 28304777 total key bytes: 6000
144​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 0.299 seconds
145​// PASS : TestTopDUContextStore::benchTopContextStore()
146​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 0.032 seconds
mwolffUnsubmitted
Done

that's pretty bad in comparison

note that we currently just rewrite the complete file, which you can't do when you use one big data base

mwolff: that's pretty bad in comparison note that we currently just rewrite the complete file, which…
rjvbbAuthorUnsubmitted
Not Done

That's removing all entries with a flush after each remove (which should be redundant).

There *is* original code that calls QFile::remove(), hopefully only when the index is not going to be reused immediately. Rewriting an entire file becomes overwriting an existing key/value pair, which all databases tested support in much the same way it is done with files.

rjvbb: That's removing all entries with a flush after each remove (which should be redundant). There…
147​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
148​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.208 seconds
149​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
150​// PASS : TestTopDUContextStore::cleanupTestCase()
151​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 3508ms
152​// KDEV_TOPCONTEXTS_USE_LMDB:
153​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38474 from sample of length 38497
154​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 29277850 total key bytes: 6000
155​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 0.267 seconds
156​// PASS : TestTopDUContextStore::benchTopContextStore()
157​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 0.028 seconds
158​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
159​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.035 seconds
160​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
161​// QINFO : TestTopDUContextStore::benchTopContextStoreFlush() Flushing the database to disk: 0.188 seconds
162​// PASS : TestTopDUContextStore::benchTopContextStoreFlush()
163​// total 52984
164​// 16 -rw-r--r-- 1 bertin bertin 8.0K May 8 14:44 lock.mdb
165​// 52968 -rw-r--r-- 1 bertin bertin 26M May 8 14:44 data.mdb
166​// PASS : TestTopDUContextStore::cleanupTestCase()
167​// Totals: 22 passed, 0 failed, 0 skipped, 0 blacklisted, 4704ms
168​// ********* Finished testing of TestTopDUContextStore *********
169​// average LZ4 compression ratio: 1.95736; 1500 compressed of 3000
170​// KDEV_TOPCONTEXTS_USE_KYOTO:
171​// QINFO : TestTopDUContextStore::benchTopContextStore() 1500 items, max length= 38492 from sample of length 38497
172​// QINFO : TestTopDUContextStore::benchTopContextStore() total value bytes: 28963844 total key bytes: 6000
173​// QINFO : TestTopDUContextStore::benchTopContextStore() Writing 1500 keys (last flushed): 22.364 seconds
174​// PASS : TestTopDUContextStore::benchTopContextStore()
175​// QINFO : TestTopDUContextStore::benchTopContextStoreRead() Reading 1500 keys: 3.267 seconds
176​// PASS : TestTopDUContextStore::benchTopContextStoreRead()
177​// QINFO : TestTopDUContextStore::benchTopContextStoreRemove() Removing 1500 keys: 0.052 seconds
178​// PASS : TestTopDUContextStore::benchTopContextStoreRemove()
179​// PASS : TestTopDUContextStore::cleanupTestCase()
180​// Totals: 21 passed, 0 failed, 0 skipped, 0 blacklisted, 38792ms
181​
182​
183​#include "test_topcontextstore.h"
184​
185​#include <unistd.h>
186​
187​#include <QTest>
188​#include <QDir>
189​
190​#include <tests/autotestshell.h>
191​#include <tests/testcore.h>
192​
193​#include <language/duchain/duchain.h>
194​#include <language/codegen/coderepresentation.h>
195​
196​#include <language/duchain/topducontextdynamicdata_p.h>
197​#include <language/duchain/topducontextdynamicdata.h>
198​
199​QTEST_MAIN(TestTopDUContextStore)
200​
201​using namespace KDevelop;
202​
203​uint TestTopDUContextStore::testKeys = 16;
204​uint TestTopDUContextStore::benchKeys = 1500;
205​
206​static QString basePath()
207​{
208​ return globalItemRepositoryRegistry().path() + "/topcontexts/";
209​}
210​
211​void TestTopDUContextStore::initTestCase()
212​{
213​ AutoTestShell::init();
214​ TestCore::initialize(Core::NoUi);
215​
216​ DUChain::self()->disablePersistentStorage();
217​ CodeRepresentation::setDiskChangesForbidden(true);
218​ QDir().mkpath(basePath());
219​
220​ // fetch real TopDUContext data from the qresource
221​ // (data obtained from a KDevelop project of the KDevelop source).
222​ QFile qfp(QStringLiteral(":/topcontextdata.base64"));
223​ if (qfp.open(QIODevice::ReadOnly)) {
224​ realData = QByteArray::fromBase64(qfp.readAll());
225​ qfp.close();
226​ }
227​}
228​
229​void TestTopDUContextStore::cleanupTestCase()
230​{
231​#ifdef Q_OS_UNIX
232​ system(QStringLiteral("ls -lshtr %1").arg(basePath()).toLatin1());
233​#endif
234​ TestCore::shutdown();
235​}
236​
237​void TestTopDUContextStore::testTopContextStore_data()
238​{
239​ QTest::addColumn<uint>("key");
240​ QTest::addColumn<QByteArray>("value");
241​ QTest::addColumn<int>("size");
242​
243​ for (uint i = 0 ; i < benchKeys ; ++i) {
244​ TopDUContextStore writer(i);
245​ QByteArray data;
246​ uint size;
247​ if (i == 0 /*|| i >= testKeys*/) {
248​ // 1st key/value pair will use the stored real data so that we can
249​ // test our own LZ4 compression scheme in the LMDB backend (random
250​ // values won't compress).
251​ // The additional values >= testKeys serve to prime the database store
252​ // to a mostly constant size.
253​ data = realData;
254​ } else {
255​ size = qrand() * 32767.0 / RAND_MAX;
256​ data.resize(size);
257​ char *d = data.data();
258​ for (uint j = 0 ; j < size ; ++j) {
259​ d[j] = qrand() * 256.0 / RAND_MAX;
260​ }
261​ }
262​ if (i < testKeys) {
263​ // we store all keys that will be used in the benchmark so the store will be primed
264​ // but only do write/read/exists/remove verifications for the requested number of items.
265​ QTest::newRow("keyval") << i << data << data.size();
266​ }
267​ if (writer.open(QIODevice::WriteOnly)) {
268​ writer.write(data.constData(), data.size());
269​ writer.commit();
270​ const auto errString = writer.errorString();
271​ if (!errString.isEmpty() && errString != "Unknown error") {
272​ qCritical() << "Failed to write entry for key" << i << "to" << writer.fileName() << ":" << writer.errorString();
273​ } else {
274​ QVERIFY(writer.flush());
275​ }
276​ } else {
277​ qCritical() << "Failed to open" << writer.fileName();
278​ }
279​ }
280​ sync();
281​}
282​
283​void TestTopDUContextStore::testTopContextStore()
284​{
285​ QFETCH(uint, key);
286​ QFETCH(QByteArray, value);
287​ QFETCH(int, size);
288​
289​ TopDUContextStore reader(key);
290​ QByteArray testval;
291​ if (reader.open(QIODevice::ReadOnly)) {
292​ testval = reader.readAll();
293​ if (testval.isEmpty() && !reader.errorString().isEmpty()) {
294​ qCritical() << "Failed to read entry for key" << key << "from" << reader.fileName() << ":" << reader.errorString();
295​ }
296​ } else {
297​ qCritical() << "Failed to open" << reader.fileName();
298​ }
299​ QCOMPARE(testval.size(), size);
300​ QCOMPARE(testval, value);
301​ QVERIFY(TopDUContextStore::exists(key));
302​ QVERIFY(TopDUContextStore::remove(key));
303​ QVERIFY(!TopDUContextStore::exists(key));
304​}
305​
306​void TestTopDUContextStore::benchTopContextStore_data()
307​{
308​ uint maxSize = 0, totalSize = 0;
309​ benchValues.reserve(benchKeys);
310​ // subsample random strings from the real topcontext data
311​ // (always from the left, there should be no interest to
312​ // randomising the offset).
313​ for (uint i = 0 ; i < benchKeys ; ++i) {
314​ uint size = qrand() * double(realData.size()) / RAND_MAX;
315​ if (size > maxSize) {
316​ maxSize = size;
317​ }
318​ benchValues.append(realData.left(size));
319​ totalSize += size;
320​ if (i >= testKeys) {
321​ // remove keys that weren't removed in testTopContextStore()
322​ // so we will time writing, not overwriting
323​ TopDUContextStore::remove(i);
324​ }
325​ }
326​ sync();
327​ sleep(1);
328​ qInfo() << benchValues.size() << "items, max length=" << maxSize << "from sample of length" << realData.size();
329​ qInfo() << "\ttotal value bytes:" << totalSize << "total key bytes:" << benchKeys * sizeof(uint);
330​}
331​
332​// benchmarks don't use QBENCHMARK because they're not suitable for being
333​// called multiple times.
334​void TestTopDUContextStore::benchTopContextStore()
335​{
336​ QElapsedTimer timer;
337​ timer.start();
338​ for (uint i = 0 ; i < benchKeys ; ++i) {
339​ TopDUContextStore writer(i);
340​ if (writer.open(QIODevice::WriteOnly)) {
341​ QByteArray data = benchValues.at(i);
342​ writer.write(data.constData(), data.size());
343​ writer.commit();
344​ if (i == benchKeys - 1) {
345​ writer.flush();
346​ }
347​ }
348​ }
349​ qInfo() << "Writing" << benchKeys << "keys (last flushed):" << timer.elapsed() / 1000.0 << "seconds";
350​}
351​
352​#include <unistd.h>
353​void TestTopDUContextStore::benchTopContextStoreRead()
354​{
355​ QElapsedTimer timer;
356​ timer.start();
mwolffUnsubmitted
Done

O_o make it a separate data file and read it from a resource instead of embedding it manually

mwolff: O_o make it a separate data file and read it from a resource instead of embedding it manually
rjvbbAuthorUnsubmitted
Done

I thought about using a qresource but the extra work seemed a bit pointless as it wouldn't reduce the size of the patch. I'd like to avoid binary files for now (until this actually begins to stand a chance to be committed).

rjvbb: I thought about using a qresource but the extra work seemed a bit pointless as it wouldn't…
357​ for (uint i = 0 ; i < benchKeys ; ++i)
358​ {
359​ TopDUContextStore reader(i);
360​ if (reader.open(QIODevice::ReadOnly)) {
361​#if defined(KDEV_TOPCONTEXTS_USE_FILES) && !defined(KDEV_TOPCONTEXTS_DONT_MMAP)
362​ uchar* data = reader.map(0, reader.size());
363​ reader.commit();
364​#else
365​ QByteArray data = reader.readAll();
366​#endif
367​ }
368​ }
369​ qInfo() << "Reading" << benchKeys << "keys:" << timer.elapsed() / 1000.0 << "seconds";
370​}
371​
372​void TestTopDUContextStore::benchTopContextStoreRemove()
373​{
374​ QElapsedTimer timer;
375​ timer.start();
376​ for (uint i = 0 ; i < benchKeys ; ++i)
377​ {
378​ TopDUContextStore::remove(i);
379​ }
380​ qInfo() << "Removing" << benchKeys << "keys:" << timer.elapsed() / 1000.0 << "seconds";
381​}
382​
383​void TestTopDUContextStore::benchTopContextStoreFlush()
384​{
385​#ifndef KDEV_TOPCONTEXTS_USE_FILES
386​ QElapsedTimer timer;
387​ timer.start();
388​ TopDUContextStore writer(0);
389​ if (writer.open(QIODevice::WriteOnly)) {
390​ writer.flush();
391​ }
392​ qInfo() << "Flushing the database to disk:" << timer.elapsed() / 1000.0 << "seconds";
393​#endif
394​}