Debugging with CDB incredibly slow

olowo726

Hi,

I've seen several posts about this topic but none have been able to solve my problem so I'll give it a try here.

Debugging with CDB and Qt creator is incredibly slow

The problem is present in both Creator 6 and 7
Debugging the same app in Visual Studio works perfectly fine
It takes a long time to launch my app with the debugger loading dlls painfully slow.
However the worst is setting a breakpoint. Then it can literally be 5 minutes before you can start stepping. Each step can also take 5 minutes.
It seems to get worse when my app grows. It's now about 200K lines of C++.

Any ideas?

cristian-adam

Qt Creator 6 and 7 use both Qt 6. Does a Qt 5 build of Qt Creator behave differently? https://download.qt.io/snapshots/qtcreator_qt5/7.0/7.0.0/

Visual Studio is not using cdb.exe for debugging, so it's not a fair comparison.

It might be that the antivirus is interfering or that there is a network debug server query.

And finally, did you install the "Qt Debug Information Files"?

olowo726

"Does a Qt 5 build of Qt Creator behave differently?" Nope

I have no antivirus installed and I'm not debugging over network. And yes, "Qt Debug Information Files" are installed.

cristian-adam

The only thing I can think of is that there is something wrong with the "symbol path". See https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/symbol-path for more details.

Otherwise if I debug Qt Creator itself with cdb it doesn't take minutes to set breakpoints or load the application.

bwilli2020

@olowo726 I have the same issue, did you ever find a solution on this?