Search code examples
qtqtimercpu-loadqtime

using QTime and Qtimer as clock in Qlabel lead to heavy cpu usage

I have Problem when i activate QTimer To Show A clock inside a Qlabel, my small software will use around 25 to 40 % of CPU Power (I3 4160) so how to solve it to take less hardware resources?

QTimer *timer1 = new QTimer(this);
     connect(timer1,SIGNAL(timeout()),this,SLOT(showtime()));
     timer1->start();

and this is my showtime() function

void Findlistrecord::showtime(){
    QTime time = QTime::currentTime();
    QString time_totext = time.toString("hh : mm : ss");
    ui->timelabel->setText(time_totext);
}
Solution

  • As I see you didn't set an interval for you timer, so your timer will trigger as soon as it can. If you want to show the time with seconds accuracy I recommend that to use interval of 1000ms to reduce the process overhead.

    timer1->start(1000);