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Regarding the CPU Usage in arm board for an example of QTableView while scrolling

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  • Pradeep KumarP Offline
    Pradeep KumarP Offline
    Pradeep Kumar
    wrote on last edited by
    #1

    Hi,

    I have a QTableview , i have used QStandardItemModel as a model , and added to QTableView, while scrolling . i have observed the CPU % gradually increases to 100%. same does not hold good in Desktop.

    May i know what id the reason?.
    Guidance will help me.
    Thanks.

    Pradeep Kumar
    Qt,QML Developer

    1 Reply Last reply
    0
    • VRoninV Offline
      VRoninV Offline
      VRonin
      wrote on last edited by
      #2

      this is due to paint being called frequently an in turn it having to query the model for data. fast scrolling brings my CPU usage to 10% (intel i7 3.6GHz). Do you use custom delegates or just pure Qt classes?

      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
      ~Napoleon Bonaparte

      On a crusade to banish setIndexWidget() from the holy land of Qt

      1 Reply Last reply
      1
      • Pradeep KumarP Offline
        Pradeep KumarP Offline
        Pradeep Kumar
        wrote on last edited by
        #3

        I am using Qt Classes , i am not using any custom delegates. Is their any difference in working in Desktop and Arm Board with the the same program?.

        Pradeep Kumar
        Qt,QML Developer

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        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          Hi,

          Depends on your Arm board, but it's likely less powerful than your desktop machine CPU/GPU wise. What board are you running your application on ?

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
          1
          • Pradeep KumarP Offline
            Pradeep KumarP Offline
            Pradeep Kumar
            wrote on last edited by
            #5

            I am using ARM 11. The application is running on ARM 11.

            Pradeep Kumar
            Qt,QML Developer

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              That's an architecture. There are lots of ARM11 based processors/boards. What are you using exactly ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              1
              • Pradeep KumarP Offline
                Pradeep KumarP Offline
                Pradeep Kumar
                wrote on last edited by
                #7

                Visiontek Pos device

                Pradeep Kumar
                Qt,QML Developer

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                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #8

                  Can you give a link to the device description ?

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  1
                  • Pradeep KumarP Offline
                    Pradeep KumarP Offline
                    Pradeep Kumar
                    wrote on last edited by Pradeep Kumar
                    #9

                    The link is here , here is the link for the specifications of the device

                    Pradeep Kumar
                    Qt,QML Developer

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                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #10

                      Ok, so you have have a single core 1GHz processor with 512MB of RAM.

                      What size is your model ?

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                      Pradeep KumarP 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        Ok, so you have have a single core 1GHz processor with 512MB of RAM.

                        What size is your model ?

                        Pradeep KumarP Offline
                        Pradeep KumarP Offline
                        Pradeep Kumar
                        wrote on last edited by
                        #11

                        @SGaist

                        The size is 320 , 240.

                        Pradeep Kumar
                        Qt,QML Developer

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                        0
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #12

                          I meant the data model

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                          Pradeep KumarP 1 Reply Last reply
                          0
                          • SGaistS SGaist

                            I meant the data model

                            Pradeep KumarP Offline
                            Pradeep KumarP Offline
                            Pradeep Kumar
                            wrote on last edited by
                            #13

                            @SGaist

                            can u brief me up regarding the data model. what is it.?.

                            Pradeep Kumar
                            Qt,QML Developer

                            jsulmJ 1 Reply Last reply
                            0
                            • Pradeep KumarP Pradeep Kumar

                              @SGaist

                              can u brief me up regarding the data model. what is it.?.

                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #14

                              @Pradeep-Kumar From your first post: "i have used QStandardItemModel as a model" - so I guess the question is how big is this model (how many elements does it contain)?

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

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                              1
                              • Pradeep KumarP Offline
                                Pradeep KumarP Offline
                                Pradeep Kumar
                                wrote on last edited by
                                #15

                                The standard item model data was having 3 columns and the rows values depends on DB values. it will increase as per the db values.

                                Pradeep Kumar
                                Qt,QML Developer

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #16

                                  Then what is the usual size of your database ?

                                  Interested in AI ? www.idiap.ch
                                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                  0
                                  • Pradeep KumarP Offline
                                    Pradeep KumarP Offline
                                    Pradeep Kumar
                                    wrote on last edited by
                                    #17

                                    Without Db also i tried the same, again i have observed the CPU % gradually increases to 100%. i didnt understand the behaviour. please guide me.

                                    Pradeep Kumar
                                    Qt,QML Developer

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                                    0
                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #18

                                      Without any test case to run, it's pretty much impossible to help you get further. There's also no information about what else is running on your target or what your application does that might or might not be influenced by what happens in your GUI.

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                      • Pradeep KumarP Offline
                                        Pradeep KumarP Offline
                                        Pradeep Kumar
                                        wrote on last edited by
                                        #19

                                        Their was some daemon process running, when i checked the application.

                                        Pradeep Kumar
                                        Qt,QML Developer

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                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #20

                                          Use top to see which is the processor hog: Likely your application but you have to verify to be sure.

                                          After that confirmation, it would also be useful if you could describe precisely how you trigger that CPU load.

                                          On a side note: which version of Qt are you using ? With which plugin ?

                                          Interested in AI ? www.idiap.ch
                                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                          1 Reply Last reply
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