[Gambas-devel] Perfomance differences between gb.gtk and gb.qt components

José Luis Redrejo jredrejo at ...176...
Mon Nov 19 10:48:38 CET 2007


2007/11/19, Benoit Minisini <gambas at ...1...>:
>
> On lundi 19 novembre 2007, José Luis Redrejo wrote:
> > 2007/11/19, Benoit Minisini <gambas at ...1...>:
> > > On lundi 19 novembre 2007, José Luis Redrejo wrote:
> > > > Hi, I'm doing some tests with a pretty complex application made in
> > >
> > > gambas.
> > >
> > > > It has quite a bunch of classes and about one thousand lines of
> code.
> > > > I was surprised when I checked the just starting the application and
> > > > let
> > >
> > > it
> > >
> > > > show the graphical interface, without interacting with it, took a
> lot
> > > > of cpu use in a quite powerful computer (checked with the
> gnome-system
> > >
> > > monitor
> > >
> > > > and later with top), but I was much more surprised when changing
> from
> > >
> > > using
> > >
> > > > gb.gtk to gb.qt the cpu use was as little as it can not be
> appreciate,
> > >
> > > so
> > >
> > > > it was around 0.
> > > > This can be easily appreciated just creating a clean new project
> with a
> > > > form, a couple of buttons and a textbox, without adding any code.
> > >
> > > Running
> > >
> > > > it with gb.qt, top only shows gbx2 comsumption at the starting and
> very
> > > > fast it disappears from the view, running it using gb.gtk the
> > >
> > > application
> > >
> > > > stays on top of the processes all the time, with about a 4% of CPU
> use.
> > > >
> > > > So, it seems there is some problem with the event loop in
> > > > gb.gtkcomponent. I think this is a very important bug in order to
> use
> > > > gambas under Gnome,
> > >
> > > as
> > >
> > > > many users do.
> > > >
> > > > Regards.
> > >
> > > Maybe Daniel could give us some details about the gb.gtk event loop.
> > >
> > > I noticed that my GTK+ programs were always far slower than my QT
> > > programs,
> > > using Gambas or not, so I didn't notice that specific event loop
> problem.
> >
> > I run mostly gtk programs and can assure you that no one (except firefox
> > when using the flash plugin) takes 6%-15% of the CPU only by showing its
> > interface. I don't think the problem is in gtk, but in the gb.gtkcomponent
> > (well, you can say that gtk makes much harder implementing an event loop
> > but there are much more bindings to gtk that have not that problem). As
> you
> > say, maybe Daniel can enlighten us.
>
> I didn't say that there is no problem in gb.gtk, I just said that I didn't
> notice because of the general slowness of GTK+ applications on my Athlon
> 2000.



I see


By reading the source code, I know that there is a problem, but I don't know
> how to fix it yet.
>
>
great, that's already a progress, so Daniel, can you help?
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