[Development] why Qt app performance low on qpa eglfs or wayland

[Milian Wolff]

On Tuesday 02 September 2014 11:18:19 Nancy Zou wrote:
> Hi All
> 
> I run qt example openglwindow on my embedded system. I find on qpa eglfs, it
> only have 35fps. On qpa wayland( compostitor Weston 1.5), it only have
> 13fps. If I run a same opengl demp directly, it can have about 70fps.
> When run Qt app, I find cpu and gpu loading is not very high. Why the fps is
> low. Which function consumed the system time? My Qt version is 5.3.0.
> Does anyone met the same problem or I should do some configuration?

You should answer this question yourself and present the results to us. Only 
you have your specific software/hardware combination setup properly.

Try Linux' `perf top` e.g. or run your application via
`perf record --call-graph=dwarf yourapp`. Then do a `perf report` and take a 
look at the results. Remember to compile your application and all important 
dependencies (esp. Qt) in release mode with debug symbols, i.e. at least use 
the compile flags `-O2 -g`.

Bye
-- 
Milian Wolff
mail at milianw.de
http://milianw.de