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bug#11657: 24.1.50; Byte compiler is a lot slower now, when run interpre


From: Eli Zaretskii
Subject: bug#11657: 24.1.50; Byte compiler is a lot slower now, when run interpreted
Date: Sat, 09 Jun 2012 14:30:43 +0300

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

The byte compiler seems to be a lot slower now, when run interpreted,
compared with how it was a couple of weeks ago.  With the current
trunk:

  D:\gnu\bzr\emacs\trunk\lisp>timep ..\bin\bootstrap-emacs -batch -f 
batch-byte-compile org\org.el

  In toplevel form:
  org/org.el:4874:1:Warning: global/dynamic var `entry' lacks a prefix
  org/org.el:4876:1:Warning: global/dynamic var `date' lacks a prefix
  Wrote d:/gnu/bzr/emacs/trunk/lisp/org/org.elc

  real    00h00m16.343s
  user    00h00m16.234s
  sys     00h00m00.093s

With trunk revision 108318:

  D:\gnu\bzr\emacs\test2\lisp>timep ..\bin\bootstrap-emacs -batch -f 
batch-byte-compile org\org.el

  In toplevel form:
  org/org.el:4873:1:Warning: global/dynamic var `entry' lacks a prefix
  org/org.el:4875:1:Warning: global/dynamic var `date' lacks a prefix
  Wrote d:/gnu/bzr/emacs/test2/lisp/org/org.elc

  real    00h00m02.125s
  user    00h00m02.046s
  sys     00h00m00.093s

That's a 8-fold slowdown.  Consequently, the bootstrap time on
MS-Windows went up from 9 minutes to 33 minutes, which is gross.

I see a similar slowdown on a x86_64 GNU/Linux machine.  Here's a
comparison with the latest emacs-24 branch:

  address@hidden:~/bzr/emacs/trunk$ time ./src/bootstrap-emacs2 -batch -f 
batch-byte-compile lisp/org/org.el

  In toplevel form:
  lisp/org/org.el:4874:1:Warning: global/dynamic var `entry' lacks a prefix
  lisp/org/org.el:4876:1:Warning: global/dynamic var `date' lacks a prefix
  Wrote /home/e/eliz/bzr/emacs/trunk/lisp/org/org.elc

  real    0m47.939s
  user    0m45.850s
  sys     0m0.340s

  address@hidden:~/bzr/emacs/emacs-24$ time ./src/bootstrap-emacs2 -batch -f 
batch-byte-compile lisp/org/org.el

  In toplevel form:
  org.el:4874:1:Warning: global/dynamic var `entry' lacks a prefix
  org.el:4876:1:Warning: global/dynamic var `date' lacks a prefix
  Wrote /home/e/eliz/bzr/emacs/emacs-24/lisp/org/org.elc

  real    0m5.883s
  user    0m5.620s
  sys     0m0.140s

There's no perceptible change in speed of the byte compiler when it is
run after being compiled.  I get the same times, plus or minus the
measurement noise, on both Windows and GNU/Linux.

Is this slowdown expected?  Can it be fixed?

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
d:/gnu/bzr/emacs/trunk/etc/DEBUG.


In GNU Emacs 24.1.50.1 (i386-mingw-nt5.1.2600)
 of 2012-06-09 on HOME-C4E4A596F7
Bzr revision: 108534 address@hidden
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (3.4) --no-opt --enable-checking --cflags
 -Id:/usr/include/libxml2 -DGLYPH_DEBUG=1'

Important settings:
  value of $EMACSDATA: D:/gnu/bzr/emacs/trunk/etc
  value of $EMACSDOC: D:/gnu/bzr/emacs/trunk/etc
  value of $EMACSLOADPATH: 
D:/gnu/bzr/emacs/trunk/lisp;D:/gnu/bzr/emacs/trunk/leim
  value of $EMACSPATH: D:/gnu/bzr/emacs/trunk/bin
  value of $LANG: ENU
  locale-coding-system: cp1255
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x e m a c s - <M-backspace> r e p o r t - e m <tab> 
<return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

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