QT charts use 50% of CPU
-
wrote on 16 Jan 2018, 10:14 last edited by
Hi,
I am using Qt 5.8 on window 8.
Running a basic qt chart example of Dynamicspline chart given by qt but when i am running this dynamicspline application in release mode still it takes 50% of my cpu usage.
What can be the issue ,if any and what can i do to reduce the cpu usage .thank u.
-
Hi,
The first idea that comes to mind is to update to a more recent version of Qt.
-
You could use the QML-version of QT-Charts, that one uses the GPU to calculate and display QtChart-objects.
-
You could use the QML-version of QT-Charts, that one uses the GPU to calculate and display QtChart-objects.
wrote on 16 Jan 2018, 12:50 last edited by@J.Hilk
i tried qml qmlf1legends chart example in qt but same the cpu gradually increases with one line drawing . -
Use Qwt (or QCustomPlot) instead, as QtCharts it is not good choose, IMHO (you can find similar issues on this forum).
-
wrote on 17 Jan 2018, 04:18 last edited by
I'd recommend using https://doc.qt.io/qt-5.10/qxyseries.html#replace-5
Replacing points one by one destroys a cpu. The metrics for me was just not even worth measuring - it was just an immediate hell no - forget that - I need faster updates. I like declarative QML for gui as a preference but calling replace on a single point fires way too many signals and takes way too long.
I throw my QML LineSeries to a QXYSeries and call replace in c++
In the future I'll probably just declare my series in C++. I wish I could have a better supported hybrid of c++ and QML charts but I have this working very fast using useOpenGL : true; (you can also c++ setUseOpenGL(true) )
3/6