QTimer is slow on mac if application is running in background



  • Hi,

    I created a simple timer application.
    @
    timer = new QTimer(this);
    timer->setTimerType(Qt::PreciseTimer);
    @

    It runs accurately on Windows and Mac according to my tests.

    However, if I put the application in background (such as placing another application window on top of it), the timer is slower by about 30% or more.

    This doesn't happen on Windows whether the application is on top or not.

    Any ideas to fix it?
    Thanks!


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    You should provide a minimal compilable example that shows the behavior so it can be tested.

    Also, which version of Qt and OS X are you using ?



  • Hi SGaist,

    I have read your post on "another thread":http://qt-project.org/forums/viewthread/37750, in which you suggested

    @
    defaults write <app domain name> NSAppSleepDisabled -bool YES
    @

    However, I am wondering if there is a way to build this configuration into a Qt app, so that users don't have to do this themselves?

    About the source code, I have put it on "github":https://github.com/codelol/QtTimer. I have also upload binaries in "release". Please try it :)

    Versions: Qt 5.3, Mac OS 10.9.4 64bit.

    Thanks!


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