Details
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Suggestion
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Resolution: Done
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P2: Important
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6.4.0
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885ae61c63 (qt/qtbase/dev) 31e4d6403c (qt/qtbase/6.4) 31e4d6403c (qt/tqtc-qtbase/6.4) 885ae61c63 (qt/tqtc-qtbase/dev)
Description
QString::toInt() seems to take ~6x longer in Qt 6.x compared to Qt 5.15.
Results below from Windows 10 21H2; customer reported similar on RHEL 8.
Benchmark code
void tst_MyClass::QString_toInt() { const QString str{"42"}; int result; QBENCHMARK { result = str.toInt(); } Q_UNUSED(result); }
Results
********* Start testing of tst_MyClass *********
Config: Using QtTest library 5.15.2, Qt 5.15.2 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019), windows 10
PASS : tst_MyClass::initTestCase()
PASS : tst_MyClass::QString_toInt()
RESULT : tst_MyClass::QString_toInt():
0.000072 msecs per iteration (total: 76, iterations: 1048576)
PASS : tst_MyClass::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped, 0 blacklisted, 275ms
********* Finished testing of tst_MyClass *********
********* Start testing of tst_MyClass *********
Config: Using QtTest library 6.0.0, Qt 6.0.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019), windows 10
PASS : tst_MyClass::initTestCase()
PASS : tst_MyClass::QString_toInt()
RESULT : tst_MyClass::QString_toInt():
0.000431 msecs per iteration (total: 113, iterations: 262144)
PASS : tst_MyClass::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped, 0 blacklisted, 313ms
********* Finished testing of tst_MyClass *********
********* Start testing of tst_MyClass *********
Config: Using QtTest library 6.4.0, Qt 6.4.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019), windows 10
PASS : tst_MyClass::initTestCase()
PASS : tst_MyClass::QString_toInt()
RESULT : tst_MyClass::QString_toInt():
0.000419 msecs per iteration (total: 110, iterations: 262144)
PASS : tst_MyClass::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped, 0 blacklisted, 326ms
********* Finished testing of tst_MyClass *********