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  1. Qt
  2. QTBUG-55109

When using OnDemand as the render settings then it will continually poll for updates which will cause a high CPU usage

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Done
    • Affects Version/s: 5.7.0, 5.9, 5.10
    • Fix Version/s: 5.9.5, 5.10.1
    • Component/s: Qt3D
    • Environment:
      macOS 10.11
    • Commits:
      a3b457659dd930ce2875d97038eb696598d0ed0c, 573c651c1fd98d83b882ab56066073a83c8844d4

      Description

      When using OnDemand as the render settings then it will continually poll for updates which will cause a high CPU usage despite the fact that no frame has been changed.

      If the render is set to be Always then it will only use 20% CPU as opposed to 120% in the OnDemand state.

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          Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-65116 Qt3D cpu usage is much worse in 5.10.0 with RenderPolicy OnDemand

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          User Story - Created by Jira Software - do not edit or delete. Issue type for a user story. QT3DS-660 Qt 3D bugs and features required for Runtime 2

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Withdrawn
          For Gerrit Dashboard: QTBUG-55109
          # Subject Branch Project Status CR V
          174863,1 Sleep a bit before next poll on OnDemand rendering 5.8 qt/qt3d Status: ABANDONED -2 0
          184487,2 Fix onDemand rendering idle loop CPU burning 5.8 qt/qt3d Status: MERGED +2 0

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              People

              Assignee:
              dragly Svenn-Arne Dragly
              Reporter:
              andysh Andy Shaw
              Votes:
              10 Vote for this issue
              Watchers:
              20 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:

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