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  1. Qt
  2. QTBUG-134490

QT Charts - Delete Locks MainThread ~O(n^2) Proportional to # of Series

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Details

    • Bug
    • Resolution: Unresolved
    • P3: Somewhat important
    • None
    • 5.15.18, 6.7.0, 6.7.3
    • Charts, GUI: Graphics Performance, GUI: Painting
    • None
    • 12c/24T Xeon, 128gb ddr4 memory, NVME SSD. Tested in RedHat Linux VM and Windows 11 Natively

    Description

      Calling Delete/DeleteLater on QChart Calls RemoveAllSeries(), which loops RemoveSeries(). This calls additional functions for each series removed during delete such as update(), which locks the main GUI thread, proportional to # of series that were plotted. This causes the application to hang.

      From Testing (Natively in Windows):

      12k Series -> ~30sec removeAll threadlock

      9.3k Series -> ~19sec removeAll threadlock

      7.8k Series -> ~12.7sec removeAll threadlock

      4.8k Series -> ~4.8sec removeAll threadlock

      1.24k Series -> ~0.39sec removeAll threadlock

      0.735k Series -> ~0.045s removeAll threadlock

      See: QT Forum - Deleting QChart Causes Application Hang

      Attachments

        For Gerrit Dashboard: QTBUG-134490
        # Subject Branch Project Status CR V
        630031,1 Charts: speedup destroying charts with a huge amount of series dev qt/qtcharts Status: ABANDONED -2 -1

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            e0348803 Miikka Heikkinen
            fleetingmemory Mason Cole
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            Dates

              Created:
              Updated:

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