[Development] Qt 5.2 Beta - is it really much slower to parse qml/javascript on android?

[BogDan]

Hi,

Android's assets are indeed slower (~2X) than Qt's resource system,
but not that slow ! :)

If I recall correctly in the beginning of this thread Kai said that using
Necessitas SDK it was ok, and I don't think he is using another technique
 to store the qml files than he is using for Necessitas. Also the assets 
implementation should be pretty much the same ... unless me (or someone else)
screw the implementation in Qt 5.2 :).

Cheers,
BogDan.



> 
> I think i know whats the issue if its still not fixed.
> 
> My guess is that you don't use the resource system of Qt but the android
> application assets to store your components, the last time i had issues
> with this all the time was lost in the horrible slow fileengine for assets on 
> android. It looked to me it was reopening the assets all the time which seems
> expensive.
> 
> I haven't tried it since 5.1 but if it is not fixed its very likely the 
> cause 
> of your problem.
> 
> Björn
> Am Mittwoch, 30. Oktober 2013, 07:07:41 schrieb Koehne Kai:
> 
>>  > -----Original Message-----
>>  > From: development-bounces+kai.koehne=digia.com at qt-project.org
>>  > [mailto:development-bounces+kai.koehne=digia.com at qt-project.org] On
>>  > Behalf Of Felipe Crochik
>>  > Sent: Tuesday, October 29, 2013 7:13 PM
>>  > To: Hausmann Simon
>>  > Cc: development at qt-project.org
>>  > Subject: Re: [Development] Qt 5.2 Beta - is it really much slower to 
> parse
>>  > qml/javascript on android?
>>  > 
>>  > Simon,
>>  > Quick update:
>>  > I tried arm7va and got almost the same results (a very small 
> improvement
>>  > but still over 3seconds).
>>  > 
>>  > It doesn't seem to be related at all to my code. It seems that it 
> is
>>  > adding some "fixed amount" of time for each component than 
> has to parse.
>>  > It doesn't look like is related to what they are or how complex. 
> For
>>  > instance in one of my tests I had a component that was a Rectangle 
> with a
>>  > Text inside, by just refactoring the Text to become another component 
> I
>>  > went from 1.2s load time to almost 2. The example does not include any
>>  > javascript!!!!
>> 
>>  Have you tried running the app with the QML Profiler attached?
>> 
>>  See
>> 
>> 
> http://qt-project.org/doc/qtcreator-2.8/creator-qml-performance-monitor.html
>> 
>>  Regards
>> 
>>  Kai
>> 
>>  _______________________________________________
>>  Development mailing list
>>  Development at qt-project.org
>>  http://lists.qt-project.org/mailman/listinfo/development
> 
> -- 
> Björn Breitmeyer | bjoern.breitmeyer at kdab.com | Software Engineer
> KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
> Germany: +49-30-521325470, Sweden (HQ): +46-563-540090
> KDAB - Qt Experts - Platform-independent software solutions
> 
> _______________________________________________
> Development mailing list
> Development at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/development
>