Emacs trunk(+AUCTeX) regressions

Emacs trunk(+AUCTeX) regressions

[Angelo Graziosi]

It seems that the changes in Emacs 23.0.60 trunk that have been done
between 2009.01.27 and 2009.01.31 cause big regressions on Cygwin and
GNU/Linux Kubuntu 8.04.02 (even if here they are weaker), mainly with
AUCTeX.

Visiting a tex file can take several seconds and when one type a character
it takes some time before it is echoized. The effect are greater with
bigger file. Also closing a buffer or quitting from Emacs takes some time.

I am using the AUCTeX build I did 2009.01.14.

Emacs has lost "fluidity" and is "unusable".

The build I did 2009.01.27 works just fine.

It is more than an year I use Emacs from CVS (GTK weekly builds) without
big problems and Emacs has been, for all this time, fast and stable. It is
a pity that this happens in a pre-pretest stage.


Cheers,
   Angelo.

Re: Emacs trunk(+AUCTeX) regressions

[Ralf Angeli]

* Angelo Graziosi (2009-02-01) writes:

> It seems that the changes in Emacs 23.0.60 trunk that have been done
> between 2009.01.27 and 2009.01.31 cause big regressions on Cygwin and
> GNU/Linux Kubuntu 8.04.02 (even if here they are weaker), mainly with
> AUCTeX.
>
> Visiting a tex file can take several seconds and when one type a character
> it takes some time before it is echoized. The effect are greater with
> bigger file. Also closing a buffer or quitting from Emacs takes some time.

I cannot reproduce this with
emacs -Q -l auctex circ.tex
using an anti-aliased DejaVu Sans Mono font or a non-anti-aliased
Terminal font on Debian sid.  In the anti-aliased case there is a
noticable lag during scrolling.  But it is not so bad that it shows
during character insertion.

So please provide a minimal test case starting from emacs -Q (likely
with a sample LaTeX file) for reproducing the problem.

-- 
Ralf

Re: Emacs trunk(+AUCTeX) regressions

[Chong Yidong]

Angelo Graziosi <Angelo.Graziosi@roma1.infn.it> writes:

> It seems that the changes in Emacs 23.0.60 trunk that have been done
> between 2009.01.27 and 2009.01.31 cause big regressions on Cygwin and
> GNU/Linux Kubuntu 8.04.02 (even if here they are weaker), mainly with
> AUCTeX.

Can anyone can reproduce this bug?

Re: Emacs trunk(+AUCTeX) regressions

[Angelo Graziosi]

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With a binary search, the changes which cause the problems I see, are 
localized between

CVS of  20090129 15:30  (works fine)

and

CVS of  20090129 15:40  (does not work fine)

i.e.

$ cat src_ChangeLog-20090129_1540-1530.diff
--- /tmp/emacs/src/ChangeLog    2009-02-01 16:24:46.031250000 +0100
+++ emacs/src/ChangeLog 2009-02-01 14:02:47.000000000 +0100
@@ -1,3 +1,26 @@
+2009-01-29  Chong Yidong  <cyd@stupidchicken.com>
+
+       * keyboard.c (pending_signals): New var.
+       (poll_for_input, input_available_signal, init_keyboard): Set it.
+       (process_pending_signals): New function.
+
+       * lisp.h (QUIT): Check pending_signals instead of
+       interrupt_input_pending.  Use process_pending_signals.
+
+       * atimer.c (run_timers, alarm_signal_handler): Update
+       pending_signals.
+
+       * process.c (wait_reading_process_output): Use
+       process_pending_signals.
+
+       * sysdep.c (emacs_write): Use process_pending_signals.
+
+       * xterm.c (XTread_socket): Update pending_signals.
+
+       * w32term.c (w32_read_socket): Update pending_signals.
+
+       * w32inevt.c (w32_console_read_socket): Update pending_signals.
+
  2009-01-29  Kenichi Handa  <handa@m17n.org>

         * xftfont.c (xftfont_has_char): New function.


To reproduce the things I have attached a tarball which contains a .tex 
file to be used under Emacs+AUCTeX and a skeleton of my ".emacs" file. 
Indeed something there triggers the problems. As you can see in ".emacs" I 
have (since I was 'children' with Emacs...):

(setq imenu-auto-rescan-maxout 500000)

which seems to cause the problems. If you comment out it, then 
Emacs-builds > 20090129-15:30 seems to work normally. Instead with 
"imenu-auto-rescan-maxout" > 80000 (default 60000, me 500000), when I type 
a key, it is echoized (appears) after: 9 seconds (gulp!) on Cygwin and 1.5 
seconds on GNU/Linux Kubuntu 8.04.02!

As I wrote: it is more than an year I use Emacs23-gtk+AUCTeX, and with 
"(setq imenu-auto-rescan-maxout 500000)", without big problems.

Ralf, I am afraid I can't give a short example to be used with emacs -Q... 
The test case should have many lines and many sectioning (section, 
chapter, subsection...). However the test case I send is simple to use: 
after visiting it with Emacs, one should only type a character a see after 
how many seconds it appear (obviously all this with the skeleton .emacs 
substituting yours temporarly).


Cheers,
Angelo.



On Sun, 1 Feb 2009, Ralf Angeli wrote:
> * Angelo Graziosi (2009-02-01) writes:
>
>> It seems that the changes in Emacs 23.0.60 trunk that have been done
>> between 2009.01.27 and 2009.01.31 cause big regressions on Cygwin and
>> GNU/Linux Kubuntu 8.04.02 (even if here they are weaker), mainly with
>> AUCTeX.
>>
>> Visiting a tex file can take several seconds and when one type a character
>> it takes some time before it is echoized. The effect are greater with
>> bigger file. Also closing a buffer or quitting from Emacs takes some time.
>
> I cannot reproduce this with
> emacs -Q -l auctex circ.tex
> using an anti-aliased DejaVu Sans Mono font or a non-anti-aliased
> Terminal font on Debian sid.  In the anti-aliased case there is a
> noticable lag during scrolling.  But it is not so bad that it shows
> during character insertion.
>
> So please provide a minimal test case starting from emacs -Q (likely
> with a sample LaTeX file) for reproducing the problem.
>
>

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Re: Emacs trunk(+AUCTeX) regressions

[Ralf Angeli]

* Angelo Graziosi (2009-02-01) writes:

> To reproduce the things I have attached a tarball which contains a .tex 
> file to be used under Emacs+AUCTeX and a skeleton of my ".emacs" file. 

It was a bit tricky to untar it because even though it has a .bz2
extension it is not compressed.

Anyway, activating the Imenu facilities as shown in your .emacs file
(setting `imenu-auto-rescan' and `imenu-auto-rescan-maxout' as well as
adding the Imenu menu) and typing a character at the end of the sample
file I got the following results:

Function Name                           Call Count  Elapsed Time  Average Time
======================================  ==========  ============  ============
imenu-update-menubar                    16          0.906322      0.056645125
imenu--make-index-alist                 1           0.905833      0.905833
LaTeX-imenu-create-index-function       1           0.905628      0.905628
re-search-backward                      27          0.8893579999  0.0329391851
LaTeX-outline-level                     23          0.0115990000  0.0005043043
LaTeX-outline-name                      23          0.002258      9.817...e-05
LaTeX-outline-offset                    23          0.001095      4.760...e-05
LaTeX-largest-level                     23          0.0003670000  1.595...e-05
imenu--truncate-items                   1           0.000117      0.000117
LaTeX-outline-regexp                    1           7.2e-05       7.2e-05

`LaTeX-imenu-create-index-function' searches from the bottom of the
buffer all the way up to its top with `re-search-backward' in order to
find LaTeX sectioning commands for the index.  This can obviously take
some time in large files.

I haven't tested with another version of Emacs and so I have no idea if
the the change in Emacs you mentioned affected the performance of
`re-search-backward' or if something else caused the slowdown in your
case.

-- 
Ralf

Re: Emacs trunk(+AUCTeX) regressions

[Angelo Graziosi]

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On Sun, 1 Feb 2009, Ralf Angeli wrote:

>
> It was a bit tricky to untar it because even though it has a .bz2
> extension it is not compressed.
>

For completeness I re-send the right tarball.


Thanks,
    Angelo.

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