QML animation make large load of CPU core I.MX6

  • I have embedded device with Freescale I.MX6 SoC. I compile Qt5.3.1 from source with support OpenGL and when I run my application I have very large use cores of I.MX6 instead use GPU at max. Other more complex animations use core of CPU even greater. Look at the htop screenshot. If I build my QML application for Windows Angle CPU of PC load at 2...3% - all work at GPU at maximum. Does works OpenGLat I.MX6 correctly or for embedded Qt is it normally (i mean great load core CPU)?

    @import QtQuick 2.2
    import QtQuick.Window 2.1
    import QtQuick.Controls 1.2
    import QtQuick.Controls.Styles 1.2

    Window {
    visible: true
    width: 360
    height: 360

    MouseArea {
    anchors.fill: parent
    onClicked: {

    ProgressBar {
    anchors.fill: parent
    anchors.margins: 40

    indeterminate: true
    style: ProgressBarStyle {
    background: Rectangle {
    radius: 2
    color: "lightgray"
    border.color: "gray"
    border.width: 1
    implicitWidth: 200
    implicitHeight: 24
    progress: Rectangle {
    border.color: "steelblue"
    color: "lightsteelblue"

    // Indeterminate animation by animating alternating stripes:
    Item {
     anchors.fill: parent
     anchors.margins: 1
     visible: control.indeterminate
     clip: true
     Row {
      Repeater {
       Rectangle {
        color: index % 2 ? "steelblue" : "lightsteelblue"
        width: 20 ; height: control.height
       model: control.width / 20 + 2
      XAnimator on x {
       from: 0 ; to: 40
       loops: Animation.Infinite
       running: control.indeterminate
       duration: 600



    and screenshot of htop

  • IMX-6 has single dual and quad core versions, open GL uses more Ram and heavily loads the core it is better to use IMx-6 Quad core with 512 0r 1GB RAM the processor is designed for audio video applications but still it gets hot very quickly even when running light weight applications..........

  • thank you for reply.

    Examples from Vivante load core of CPU more less then Qt application - 5...10%.
    If I use ListView and scroll content by finger "left-rigth" - core CPU loaded by render thread even more (upto 70% and more)...
    So is it normally, or it is wrong use compiler options, or something else?

    P.S If I use qml animation, power consumption is increases +5 watt. Explicitly GPU is activated. But the CPU core is loaded very hardly too.

Log in to reply

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.