[Interest] Debugging very slow in my MainWindow

[Etienne Sandré-Chardonnal]

Hi André,

Thanks for the links. It looks very similar to my issue, even if I'm using
gdb 7.5.91. Maybe the 7.6 slowdown was already present in this late 7.5
release. I will try an older gdb (I hope I can find one in older mingw
releases as compiling with mingw/msys is often a pain)

Regards,

Etienne


2013/6/7 André Pönitz <andre.poenitz at mathematik.tu-chemnitz.de>

> On Fri, Jun 07, 2013 at 12:59:38PM +0200, Etienne Sandré-Chardonnal wrote:
> > Dear all,
> >
> > When I'm debugging my project (gcc 32 and 64bit mingw-w64, Qt 4.8.1)
> under
> > QtCreator (2.6.0), it's not ultra-fast, but usable, in most of my code.
> > However, when stepping inside my MainWindow class, and especially when
> > unrolling some "Locals and Expressions", it takes about 1min to respond,
> or
> > sometimes more (but then I kill gdb since I'm not patient enough...)
> > I tried to disable debug helpers, and it doesn't help.
> >
> > Seems I feel that this comes from the local & expression retrieval by
> gdb, the
> > details of my class are below.
>
> It depends a lot on your version of GDB. Especially recent versions
> exhibit severe performance regressions, to a degree that renders them
> basically unsuitable for serious use.
>
> See e.g. http://sourceware.org/bugzilla/show_bug.cgi?id=15412
> or http://sourceware.org/bugzilla/show_bug.cgi?id=15519
>
> The problem seems to be related to the handling of type information
> which is especially bad in the Qt Creator context because of the
> heavy use of "pretty printing" for data display, which requires quite
> a bit of type manipulation under the hood.
>
> I would recommend to stick to GDB 7.4.1 (or something close to that)
> as long as this unfortunate situation lasts. On Linux building GDB
> from source is a straight-forward five-minute ./configure && make,
> for MinGW you could try http://builds.qt-project.org/job/gdb-windows/
>
> Andre'
>
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