Re: Terminally slow (75 seconds) on some steps

[Andrew Cagney <ac131313 at redhat dot com>]

> On Thu, 17 Jul 2003 12:34:42 -0400 Andrew Cagney <ac131313@redhat.com> wrote:
>
>
> > Is this a threaded program on GNU/Linux?  5.3 contained a major 
> > performance improvement for threaded debugging.
>
>
> Threads are only planned. There is a lot of locks, but only one thread.
>
>
> > Also, something from April '02 is seriously old.  Try either 5.3, or a 
> > 6.0 snap (see http://www.gnu.org/software/gdb/download/)
>
>
> I have here Cvs HEAD and it gives 68->11 seconds improvement. It still
> isn't the same as outside debugger, but it's usable, especially because
> single-stepping is faster too.

11 seconds per step?  Still painfully slow :-(

What exactly is the system your using?  Can you capture 
strace/ktrace/truss output for GDB doing a stepi?

By `locks' you mean?  If the program is using lots of signals then, 
again, its going to get slow - they have to go through GDB.

enjoy,
Andrew