Re: Profiling GTK within an application

[Stefan Kost <ensonic hora-obscura de>]

Hi,

Quoting Binary Chen <binary chen gmail com>:

> On Sat, 2007-10-27 at 11:06 +0300, Stefan Kost wrote:
> > Chris Rorvick schrieb:
> > > I'm attempting to profile GTK in an application and I'm wondering what
> > > methodology others use to accomplish this.  Is there any documentation
> > > that addresses this topic that I should refer to?  Any caveats worth
> > > pointing out?  Here is where I'm at ...
> > >
> > > I recently upgraded an application using GTK 2.6 to use GTK 2.10,
> > > quickly followed by an upgrade to 2.12.  In both cases, the upgraded
> > > version of the application consumed 3-5x the CPU as compared to the
> > > original version using 2.6.  This comparison was done anecdotally using
> > > top on a Solaris workstation.
> > >
> > This is most likely caused by cairo. You should also see a bit less  
> >  CPU usage in
> > 2.12 compared to 2.10 (or more precise newer cairo should perform a  
> >  bit better).
> Which version of cairo will cause this problem, more precise?

gtk-2.6 does not use cairo at all. newer version do and were causing a  
bit of slowdown. On devices without FPU its quite a notable slowdown  
as cairo uses floating point math here and there.

Stefan

> > >
> > > My first step was to have profiled versions of these libraries built in
> > > the hope that I could use them to isolate where the additional cycles
> > > were being burned.  Several builds and profiled runs later, and after a
> > > fair amount of searching the Internet, I've concluded that I'll never
> > > get anything out of shared objects instrumented with GCC; all code to be
> > > profiled must be statically linked.  If you know this to be untrue,
> > > please let me know!  :)  My plan now is to build static versions of all
> > > GTK libraries instrumented for profiling and link against those.
> > >
> > I would suggest to use a sampling profiler, like oprofile, sysprof, but all
> > those are linux profilers (they need a kernel module). But I am sure there a
> > sampling profilers for solaris too. The advantage is that you don't need to
> > recompile your apps (given you have debug symbols alreday) and it works with
> > shared libs too.
> >
> > Stefan
> >
> >
> > > FYI, Our platform is Solaris 10 (x86) compiling with GCC 3.4.
> > >
> > > Thanks in advance,
> > >
> > > Chris Rorvick
> > > _______________________________________________
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> > > gtk-app-devel-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> >
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