[Development] QtSC: Scene Graph discussion

Thiago Macieira thiago.macieira at intel.com
Thu Aug 1 20:59:31 CEST 2013

On quinta-feira, 1 de agosto de 2013 19:38:12, Laszlo Papp wrote:
> 3

This discussion is going off on a tangent but...

you do realise that there's an overhead associated with dynamic libraries, 
right? The code runs slightly slower due to indirect access to functons and 
data, and there's a start-time impact due to the relocation and dynamic 
linking. Even if you use prelink, the problems do not go away completely.

I find it hard to believe that you have a device with "small NOR/NAND flash" 
(your words), a very quick processor and large amounts of RAM to cache 

Without knowing the specifics, I find the situation inconsistent. You're 
probably better off statically linking everything into one huge binary, using 
the Qt feature system to drop features from the build. Remember to drop the -
fPIC flag when building Qt too, to improve code generation.

Please take a look at this email from almost exactly one year ago and the 
thread it belongs to for more information:

> On Thu, Aug 1, 2013 at 7:25 PM, Hausmann Simon 
<Simon.Hausmann at digia.com>wrote:
> >  Interesting point.
> >
> >  In your environment where you are already building your custom version
> >
> > of Qt, how many processes do you expect to be running simultaneously that
> > are also using QtSceneGraph (without QtQml/QtQuick)?

Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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