Re: Terminally slow (75 seconds) on some steps

[Andrew Cagney <ac131313 at redhat dot com>]

> On Mon, 21 Jul 2003 10:21:08 -0400 Andrew Cagney <ac131313@redhat.com> wrote:
>
>
> > So 11 seconds after you typed `run'.
> > (The word startup can either be appled to that time after "run", or the 
> > time for gdb to reach the first "(gdb)" prompt :-().
>
>
> Sorry, 11 seconds after "run" command. Gdb startup takes about one
> second.

good (but the time is bad).

> > Lots of shared libraries?

Ok, during library load, GDB has to constantly start/stop the target - 
and that slows things down.  Would you be able to oprofile your entire 
system so its possible to see exactly where that 11 seconds goes?

A simple gprof isn't sufficient: it is the combination of GDB <-> 
libthread-db? <-> kernel <-> program, that slows things down.

The speed improvement in moving from 5.2 -> 5.2 came from identifying a 
situtation where GDB was performing millions of system calls.  There 
will likely be other cases.

I suspect, because of what you'r using, GDB is loading up libthread-db 
and that may also add to the load.

Andrew