Hi all,
I'm a new by to Qt. Please help me to understand this problem:
I have a hardware with Quad-core CPU and i use Qt to create an app for rendering image. When I click the button my app create a new windows then a new thread for rendering image. I click button 4 times and use htop to monitor CPU performance. I saw that only 1 core load 100% while others core <5%. I don't know why? It should be running parallel 4 threads on 4 cores and CPU on each core have to be the same value?

]]>https://forum.qt.io/topic/60846/how-to-create-thread-on-a-quad-core-cpuRSS for NodeTue, 19 May 2026 21:30:05 GMTFri, 20 Nov 2015 07:25:24 GMT60I would suggest to add some debug output (using qDebug() << "...";) to your code to see what really happens.
I addition you could check whether your app really starts several threads (on Windows you can use "Process Explorer" from SysInternals suite.

]]>https://forum.qt.io/post/298951https://forum.qt.io/post/298951Fri, 20 Nov 2015 09:40:45 GMT@jsulm I start thread in RenderThread constructor.

]]>https://forum.qt.io/post/298948https://forum.qt.io/post/298948Fri, 20 Nov 2015 09:16:14 GMTWhere do you start the thread? Creating an instance is not enough.

]]>https://forum.qt.io/post/298946https://forum.qt.io/post/298946Fri, 20 Nov 2015 09:10:28 GMT@jsulm is this correct?
Window *window;
window = new Window();
window->show();
in windows class constructor beside draw windows i alse call the thread:
thread = new RenderThread(); (I declare thread in windows.h)
in RenderThread Class contain run() function. So I think new thread will be created when i click the button.
Here is my project: https://github.com/NguyenTrongThinh/Queuedcustomtype-.git

]]>https://forum.qt.io/post/298945https://forum.qt.io/post/298945Fri, 20 Nov 2015 09:02:20 GMTHow do you create new thread if the button is clicked?
A new windows in your app does not mean a new thread.

]]>https://forum.qt.io/post/298932https://forum.qt.io/post/298932Fri, 20 Nov 2015 07:49:41 GMT