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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: Qt Creator 6.0.2
Affects Version/s: Qt Creator 6.0.0
Component/s: C/C++/Obj-C++ Support
Labels:
None

Platform/s:

macOS, Windows
Commits:
d65e47b5c6 (qt-creator/qt-creator/6.0) d65e47b5c6 (qt-creator/qt-creator/master) d65e47b5c6 (qt-creator/qt-creator/qmlprojectstorage) d65e47b5c6 (qt-creator/qt-creator/qds-3.0)

Description

In this bug report I am going to test the parsing and code completion speed between Qt Creator 5.0.2 and Qt Creator 6.0.0.

Qt Creator 5.0.2 was built with Qt 5.15.2 and using Clang 12.0.0.
Qt Creator 6.0.0 was build with Qt 6.2.1 and using Clang 13.0.0.

This was done on a Lenovo A485 laptop with AMD Ryzen 7 PRO 2700U from 2019 with Windows 10 x64.

I did copy the clang and libclang.dll from one version to another to see if the performance degradation was due to the Clang version or to the Qt version.

I used DebugView to get the logging and before starting qtcreator.exe from a cmd window I enabled some logging like this:

set QT_LOGGING_RULES=qtc.clang*=true

Then I opened Qt Creator 6.0 source code, waited for the project to load completely and then hit Ctrl+K, then opened up texteditor.cpp, went to the end of the file, waited for syntax highlighting to change colors, and then issued a code completion like:

IEditor *BaseTextEditor::duplicate()
{

    ...
    
    QTC_CHECK(false);  
    return nullptr;  ^ Ctrl + Space
}

Then closed texteditor.cpp and did the same operation in total of three times.

Qt Creator 5.0.2 with Clang 12.0.0

00000586	73.45362854	[12812] UpdateAnnotationsJobRunner needed 7145 ms
00000599	76.26050568	[12812] CompleteCodeJobRunner needed 634 ms
00000630	87.76027679	[12812] UpdateAnnotationsJobRunner needed 6397 ms
00000643	90.27484131	[12812] CompleteCodeJobRunner needed 677 ms
00000677	100.90406036	[12812] UpdateAnnotationsJobRunner needed 6434 ms
00000690	103.72553253	[12812] CompleteCodeJobRunner needed 653 ms

Qt Creator 5.0.2 with Clang 13.0.0 from Qt Creator 6.0.0

00000598	81.80663300	[11588] UpdateAnnotationsJobRunner needed 7504 ms
00000611	85.54234314	[11588] CompleteCodeJobRunner needed 672 ms
00000642	96.97460938	[11588] UpdateAnnotationsJobRunner needed 6484 ms
00000655	100.26199341	[11588] CompleteCodeJobRunner needed 780 ms
00000692	112.19184875	[11588] UpdateAnnotationsJobRunner needed 6688 ms
00000712	115.22787476	[11588] CompleteCodeJobRunner needed 746 ms

As you can see there is some slowdown, but it's not that significant.

Qt Creator 6.0.0 with Clang 13.0.0

00000586	93.61444855	[8172] UpdateAnnotationsJobRunner needed 11569 ms
00000599	99.96090698	[8172] CompleteCodeJobRunner needed 2584 ms
00000631	117.61567688	[8172] UpdateAnnotationsJobRunner needed 11374 ms
00000644	124.08489227	[8172] CompleteCodeJobRunner needed 2647 ms
00000679	138.95407104	[8172] UpdateAnnotationsJobRunner needed 11348 ms
00000692	144.91577148	[8172] CompleteCodeJobRunner needed 2291 ms

Qt Creator 6.0.0 with Clang 12.0.0 from Qt Creator 5.0.2

00000586	90.89379883	[12876] UpdateAnnotationsJobRunner needed 11360 ms
00000599	97.30936432	[12876] CompleteCodeJobRunner needed 2611 ms
00000631	114.96936035	[12876] UpdateAnnotationsJobRunner needed 11809 ms
00000644	127.81418610	[12876] CompleteCodeJobRunner needed 2703 ms
00000676	143.90559387	[12876] UpdateAnnotationsJobRunner needed 11716 ms
00000689	150.98699951	[12876] CompleteCodeJobRunner needed 3339 ms

The performance with Qt Creator 6.0.0 has taken a serious hit. At least 3x for code completion.