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Thread: QFileSystemModel is sorting data which is hanging GUI

  1. #1
    Join Date
    May 2019
    Qt products
    Qt4 Qt5

    Default QFileSystemModel is sorting data which is hanging GUI


    I am working on a project where it uses QFilesystemModel with QTableView to display data present in network share. Recently we moved from Qt 4.8 to Qt 5.11.3. After moving to 5.11.3, we are facing performance issues with QFilesystemModel with around 1500-2000 entries in the network share. It is using QSortFilterProxyModel to sort and filter some entries.

    The view is taking time in sorting the data. To avoid that, I removed the QSortFilterProxyModel from my code. But it is still sorting the data and taking time causing the GUI hang. I even disabled sorting in QTableView using setSortingEnabled(false) but with no use. I am not sure how the data is being sorted.

    Is there anyway to improve performance with QFilesystemModel? How to disable sorting with QFilesystemModel/QTableView?

    I am a little bit confused as I am a newbie to QT programming. Any help is much appreciated.


  2. #2
    Join Date
    Jan 2006
    Bremen, Germany
    Thanked 75 Times in 71 Posts
    Qt products
    Qt3 Qt4
    Unix/X11 Windows

    Default Re: QFileSystemModel is sorting data which is hanging GUI

    Since QFilesystemModel does not sort by itself the reason can't be the sorting but something else. Therefore I would suggest to create a small example and use a profiler like e.g. valgrind/callgrind to see where the cpu spend it's time.

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