From: Dov Grobgeld <dov.grobgeld@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Chong Yidong <cyd@gnu.org>, 10580@debbugs.gnu.org
Subject: bug#10580: 24.0.92; gdb initialization takes more than one minute at 100% CPU
Date: Wed, 9 May 2012 00:07:05 +0300 [thread overview]
Message-ID: <CA++fsGGLaJF6o+vxE0SUf0m+KJyNE4oUR01D+w+8NuRYu1Nm_g@mail.gmail.com> (raw)
In-Reply-To: <83txzq1s4y.fsf@gnu.org>
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So my latest investigations suggest that the problem is the
"-file-list-exec-source-files" command which generates the huge output due
to the large number of files that is part of the project.
The following shows the problem from the command line.
echo -file-list-exec-source-files > /tmp/gdb.in
gdb MyExec < /tmp/gdb.in > /tmp/gdb.out
wc /tmp/gdb.out
11 69 3725105 /tmp/gdb.out
(Note that this is on a my home box, where the output is much larger than
what I reported this morning possibly due to different paths).
So there are still several questions:
* Why does it take several minutes to parse a 3.7M file? Could it be
related to the fact that gdb-mi/emacs concatinates the entire string before
trying to parse it. Still 3.7M is far too much.
* Noted that I can't run gdb MyExec < /tmp/gdb.in in a shell buffer. It
gets slower and slower while the CPU stays at 100%.
* There is a huge redundancy in gdb.out. The command
-file-list-exec-source-files should output all source files included, but
the same source files are listed multiple times. Consider the huge file
size reduction after sorting and uniq'ing:
perl -ne 'while(/(\w+)=\"(.*?)\"/g) { print "$1=$2\n"; }' /tmp/gdb.out |
sort | uniq | wc
3931 3931 220654
Why doesn't -file-list-exec-source file do uniq internally. This seems like
a bug in gdb.
* Why does gdb-mi.el do -file-list-exec-source-files at all? Can't it
search for source files on demand?
Regards,
Dov
On Tue, May 8, 2012 at 8:47 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > From: Chong Yidong <cyd@gnu.org>
> > Date: Wed, 09 May 2012 00:25:00 +0800
> > Cc: 10580@debbugs.gnu.org
> >
> > Those are status messages from turning on GDB's MI (machine interface)
> > system, I think, though I don't see why it makes so much difference in
> > your case.
> >
> > If you type, from the shell,
> >
> > gdb -i=mi YOUR-BINARY
> > r
> >
> > do you similarly see a huge output?
>
> As you know, in addition to "run", gdb-mi.el sends lots of other
> commands behind the scenes, so the above is not a faithful simulation
> of what happens when GDB is run by Emacs. But I agree that if the
> above produces similarly voluminous output, we cannot really blame
> gdb-mi.el.
>
>
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next prev parent reply other threads:[~2012-05-08 21:07 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-22 12:42 bug#10580: 24.0.92; gdb initialization takes more than one minute at 100% CPU Dov Grobgeld
2012-01-23 0:53 ` Glenn Morris
[not found] ` <CA++fsGG4YuTtb2VC9R+GRcPN5+JSaKpkb+uO3WAX0+VXmh8HDQ@mail.gmail.com>
2012-01-23 9:21 ` Glenn Morris
2012-01-25 0:37 ` Glenn Morris
2012-01-25 8:49 ` Dov Grobgeld
2012-01-25 9:39 ` Dov Grobgeld
2012-01-25 19:05 ` Glenn Morris
2012-04-30 5:33 ` Dov Grobgeld
2012-04-30 6:36 ` Dov Grobgeld
2012-05-06 4:13 ` Chong Yidong
2012-05-06 4:55 ` Dov Grobgeld
2012-05-06 5:39 ` Chong Yidong
2012-05-06 7:06 ` Dov Grobgeld
2012-05-07 2:53 ` Chong Yidong
2012-05-07 5:07 ` Dov Grobgeld
2012-05-07 6:11 ` Chong Yidong
2012-05-07 6:26 ` Chong Yidong
2012-05-08 5:33 ` Dov Grobgeld
2012-05-08 7:56 ` Dov Grobgeld
2012-05-08 8:28 ` Chong Yidong
2012-05-08 11:59 ` Dov Grobgeld
2012-05-08 16:25 ` Chong Yidong
2012-05-08 17:47 ` Eli Zaretskii
2012-05-08 21:07 ` Dov Grobgeld [this message]
2012-05-08 21:24 ` Andreas Schwab
2012-05-08 21:30 ` Dov Grobgeld
2012-05-09 7:47 ` Andreas Schwab
2012-05-09 8:44 ` Dov Grobgeld
2012-05-09 17:36 ` Eli Zaretskii
2012-05-10 6:00 ` Dov Grobgeld
2012-05-10 14:13 ` Chong Yidong
2012-05-10 19:07 ` Dov Grobgeld
2012-05-10 20:25 ` Stefan Monnier
2012-05-11 6:33 ` Chong Yidong
2012-05-11 8:29 ` Dov Grobgeld
2012-05-11 9:47 ` Eli Zaretskii
2012-05-11 13:27 ` Chong Yidong
2012-11-05 20:36 ` Dov Grobgeld
2012-11-05 20:46 ` Eli Zaretskii
2012-11-05 23:51 ` Stefan Monnier
2012-05-10 16:32 ` Eli Zaretskii
2012-05-10 18:43 ` Dov Grobgeld
2012-05-08 17:38 ` Eli Zaretskii
2012-12-14 4:14 ` bug#10580: 24.0.92; gdb initialization takes more than one minute at 100 Jean-Philippe Gravel
2012-12-18 4:45 ` Jean-Philippe Gravel
2012-12-21 4:01 ` Chong Yidong
2013-03-01 3:31 ` Jean-Philippe Gravel
2013-03-11 17:14 ` Stefan Monnier
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