Qt-interest Archive, April 2008
Fwd: Qt 4.4.0 Performance boost
Message 1 in thread
Hi all,
Today the following mail was posted on the Qwt mailing list. Looks like the
Trolls did an excellent job with Qt 4.4.0.
Uwe
---------- Forwarded Message ----------
Yesterday I started playing around with my new application wich has to
draw 40.000 points 5 times per second. I implement all neccersary
classes and get started. My computer is a high-end Quad-Core (Win XP, Qt
4.3.4, qwt 5.1 SVN) and my application brings it to 50% usage and the
program was unusable due to high reaction times in the GUI. I run VTune
and saw that most CPU power were lost directly in the QT-libs, not in my
classes or even in some QWT related stuff.
Yesterday evening I was a bit frustrating at thought about implementing
increment drawing or level of detail and so on for tuning.
Tomorrow I saw that Qt 4.4.0 is out and thought: give it a try. I
install it and run my test again. I can't believe my eyes. CPU useage is
around only 5% and that is caused ONLY (my plots live in a TabWidget, so
I can hide them that they dont't get updated) by my data acquisition.
My hint for all 'performance-junks' try out QT 4.4.0.
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