[Development] QML Profiler for Qt5

Wed Oct 31 10:59:30 CET 2012

Hello Torsten,

   the internal architecture of the rendering has changed significantly 
between QtQuick1 and QtQuick2, due to the fact that the second one is 
based on a scene graph.  In this second case, we don't have individual 
paint events to track, since the rendering is managed in a synchronous 
way by the scene graph.  What individual items do is set a "dirty" flag 
which will trigger a redraw on the next pass of the renderer.  In other 
words, we don't have strict "paint" events with a duration, in the same 
sense as we did in QtQuick1.  That's why the initial decision was to 
track the updates of the animation driver instead; a measurement of the 
framerate of the animations was considered to be significant when it 
comes to potential optimizations a developer would be interested in.

   That being said, there are plans to display more information about 
the internals of the renderer (basically, time it takes to parse the 
scenegraph within a frame, and time it takes to generate the related 
OpenGL commands).  Unfortunately, that is still a work in progress.

   If you are performing that rotation with a RotationAnimation, 
NumberAnimation or PropertyAnimation, you should be able to see the 
frames in the profiler trace.  If you are only updating the related 
property with some sort of timer by using bindings or overwriting the 
value from JavaScript, you will only see the event related to the code 
that modifies said property in the bindings section or/and in the 
JavaScript tab of the profiler.

   best regards,
   Christiaan Janssen

On 10/30/2012 10:24 AM, Labs, Torsten wrote:
> Hello Christiaan,
> thx for the answere. So as i understood now QML Profiler does only 
> show animation events an not initial paintings? For QtQuick1.0 it was 
> working. Is it planned?
> We have a roation of an arrow every 100ms and even there we can't see 
> any paint events.
> Greetings
> Torsten
>
> With best regards,
> Torsten Labs
>
> Siemens AG
> Industry Sector
> Industry Automation Division
> mailto:torsten.labs at siemens.com
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> ------------------------------------------------------------------------
> *From:* Christiaan Janssen [mailto:christiaan.janssen at digia.com]
> *Sent:* Monday, October 29, 2012 4:38 PM
> *To:* Labs, Torsten
> *Cc:* development at qt-project.org
> *Subject:* Re: [Development] QML Profiler for Qt5
>
> Hello Torsten,
> I took a look at the file you provided.  I didn't see anything wrong 
> with it.  It's just that you don't have any animation frame events.  
> Does you application have animations?  Elements like Flickable or 
> Behaviour also use animations, those should show.  If not, that would 
> explain why you don't see them in the trace.
>
> The Qml profiler, when profiling Qt5 animations, shows the frame 
> events for animations, but not paint events for static objects.
>
> I hope this explanation helps.
>
> Best regards,
> Christiaan Janssen
>
> On 10/29/2012 02:47 PM, ext Labs, Torsten wrote:
>> Hello,
>> i tried to connect a QML Profiler from Qt5 with my Qt5 project and 
>> unfortunaly i can not see any paint events. The QML Profiler connects 
>> remote to a Arm9 board. Do i have to add something else or is it just 
>> not implemented yet in Qt5 Beta1? Attached you can see a recorded trace.
>> Greetings
>>
>> With best regards,
>> Torsten Labs
>>
>> Siemens AG
>> Industry Sector
>> Industry Automation Division
>> Industrial Automation Systems
>> Factory Automation
>> mailto:torsten.labs at siemens.com
>>
>> Siemens Aktiengesellschaft: Chairman of the Supervisory Board: 
>> Gerhard Cromme; Managing Board: Peter Loescher, Chairman, President 
>> and Chief Executive Officer; Roland Busch, Brigitte Ederer, Klaus 
>> Helmrich, Joe Kaeser, Barbara Kux, Hermann Requardt, Siegfried 
>> Russwurm, Peter Y. Solmssen, Michael Suess; Registered offices: 
>> Berlin and Munich, Germany; Commercial registries: Berlin 
>> Charlottenburg, HRB 12300, Munich, HRB 6684; WEEE-Reg.-No. DE 23691322
>>
>>
>>
>> _______________________________________________
>> Development mailing list
>> Development at qt-project.org
>> http://lists.qt-project.org/mailman/listinfo/development
>
>
> -- 
> Christiaan Janssen
> Senior Software Engineer
> Digia, Qt
>
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-- 
Christiaan Janssen
Senior Software Engineer
Digia, Qt

Digia Germany GmbH
Rudower Chausse 13, 12489 D-Berlin
Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B,
Geschäftsführer: Mika Pälsi, Juha Varelius, Anja Wasenius
Email: Christiaan.Janssen at digia.com
Tel: +49 30 63 92 32 55
http://qt.digia.com
Qt Blog: http://blog.qt.digia.com/
Qt Facebook: www.facebook.com/qtcommercial
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Digia Germany is a group company of Digia Plc,
Valimotie 21, FI-00380 Helsinki Finland
Visit us at: www.digia.com
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