Qt GUI Performance Help!

Hi There,

Im using the mini2440 and im having a VERY SERIOUS proplem!!

I have compiled Qt-Embedded 4.6.1 for the mini 2440.

Now my issue is that the Performance of the GUI is really bad, it takes up
to 5 seconds to open one window from another window, and atleast 1 second
till it reacts on pressing a QButton, also it takes up to 15 secs to start
a Qt application.

The application uses up 1t 100% CPU and like 70% of the memory


Whats the ebst way to accelerate this?


im using the fb to display and this are my config options:
./configure -v \
-embedded arm -xplatform qws/linux-arm-g++ -prefix /usr/qt \
-nomake examples -nomake demos -opensource \
-no-accessibility -no-sql-sqlite -no-phonon -no-phonon-backend -no-qt3support \
-no-scripttools -no-mmx -no-3dnow -no-sse -no-sse2 -no-cups -no-dbus -no-glib \
-qt-libtiff -qt-libpng -qt-libmng -qt-libjpeg -qt-gfx-linuxfb -qt-mouse-tslib -qt-gfx-qvfb \
-shared –debug


if i run without -debug the programms failw ith Segmentation fault based on the compiler optimations



Im currenty having the QT/E libs on the sdcard and they are like 80MB,
which leads me to my 2end not so importaint qestion atm.

Is there alreaddy a Version of Qt-e on the device? and if so how can i use
it?

Whats the best way to shrink down the Qt-e libs to the minimal/requred size
to fit into the 128 MB of flash memory?

I would really appreciate any HELP!


THANKS ALOT!!

I also have the similar kind of issue on an arm processor. The problem seems to be more prominent with some specific widgets like tab widget. Were you able to resolve it? Please help.

one way to speed up the application is to make two applications, one server and other client. As we know that at least one Qt application in emd. linux needs to be the QWS server. If you have only single application that also acts as a server which sometimes does not help if your own app is doing too much computation.

so just make a dummy server and lauch your application as normal client. But this does not guaranty the optimal speed but it will do some speed up.

as for your second question, yes you can shrink the size of the qt libraries but commenting out the unnecessary classes that you do not need. use the qconfig tool

Splitting up the application in two parts is not going to help much, I believe. Even a simple gui application without any computations, is responding very slow on clicks and the painting is slow as well. This becomes more prominent if number of widgets are more.

Have anybody here solved the problem? I have the same issue too and don't know how to improve it.