Hi everyone,
I started investigating my gdb build's slowness. I am currently comparing
mingw-builds vs my builds and notice a 6-8 (mingw-builds) vs 14-16 (mine)
second startup time of a simple QWidget application. I have tried the GDB
7.5 release, and I see the same results. For simplicity's sake, I'm
building and rebuilding GDB without Python from MSYS. So I think I've ruled
out:
- cross vs native compiled gdb
- debug info in the loaded libraries themselves
- GDB release vs SVN trunk
When I do
gdb testapp
set verbose on
run
I see that the extra time is spent in the "Loading Symbols from"
QtCore4d.dll (2 vs 6 seconds) and QtGui4d.dll (6 vs 18 seconds). This is my
visual perception only.
I have now rebuilt gdb with "--disable-nls" and I believe this is the
thing. Don't ask me why this is. The startup time reduces from ~19 seconds
to 6-7 seconds, which is the same as mingw-builds gdb.
Should I report a bug for this to the gdb devs? I doubt I will be able to
describe it well enough to be helpful, nor do I think this will have a high
priority...
Another mystery solved by your anonymous hero,
Ruben
2012/9/12 <[email protected]>
> K. Frank wrote:
> > >> Kai wrote:
> > >>> [...] The only other
> > >>> difference from the log is that rubenv's gdb also prints some
> '=cmd-param-
> > >>> changed,param="' messages, while mingw-builds does not.
> > >>
> > >> What log is this? I haven't notices gdb emitting any unexpected
> messages, but
> > >> I'd be glad to look if this might be a hint about something.
> > >
> > > This is from the debugger log output of Qt Creator
> (Window->Views->Debugger Log).
> > > Logging the exact times a command took can be enabled in the context
> menu.
> >
> > Okay. I don't use Qt Creator, so I guess I don't have this log.
>
> That's also available as "normal" GDB/MI output.
>
> You should get it when starting gdb with -i mi on the command line.
>
> Andre'
>
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