[Development] Qt 5.0 Beta Performance

[Samuel Rødal]

On 09/03/2012 09:42 AM, ext Samuel Rødal wrote:
> On 08/31/2012 02:05 AM, ext David Boosalis wrote:
>> I download the latest beta version of Qt 5.0 onto my Linux box (Kubuntu
>> 12.04) . For  a beta it looks real good, but one thing I found
>> concerning was the performance.  I mean even running the demo "samegame"
>> take over 98% of my cpu. Being that it is only the first beta release I
>> am sure there is plenty of room for optimization,   but 98% of my
>> I5-2500 cpu seems  a little excessive. I did the default configure and
>> build so maybe it was built without any optimization.  Any thoughts on
>> this ?
> 
> I only see it hovering at around 7 % CPU on Ubuntu 12.04 with Intel HD
> Graphics 3000. It could as someone else mentioned be caused by a lack of
> vsync enabled in the graphics driver control panel, or in the desktop
> effects control panel on KDE. A lack of vsync might cause rendering to
> happen at a rate of many hundred fps, way above what's necessary.

Alternatively, your OpenGL driver ends up using a software fallback.
Could you provide the output of running "glxinfo" on your machine?

--
Samuel