* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
@ 2014-10-17 15:04 Fabrice Niessen
2014-10-17 15:41 ` Eli Zaretskii
0 siblings, 1 reply; 14+ messages in thread
From: Fabrice Niessen @ 2014-10-17 15:04 UTC (permalink / raw)
To: 18752-ubl+/3LiMTaZdePnXv/OxA
Hello,
Maybe the test is partial -- even surely. Though, I wonder why Cygwin
Emacs is 2 times quicker than its Windows counterpart to tangle an Org
file, and export it to HTML?
Observations:
- With the Widows binary "GNU Emacs 24.3.94.1 (i686-pc-mingw32) of
2014-10-02" (compiled by Dani), it always takes around 2:35.
- With the Cygwin executable "GNU Emacs 24.3.93.1 (i686-pc-cygwin) of
2014-08-15", it always just takes around 1:19 for the same operation.
Needless to say: same config file, same Org mode version (8.3beta from
Git), same machine, etc.
The file I used for the test is my Emacs configuration file, to be found
on https://github.com/fniessen/emacs-leuven/blob/master/emacs-leuven.txt.
The command I executed, and for which I took the above measures, is:
--8<---------------cut here---------------start------------->8---
(defun org-save-buffer-and-do-related ()
"Save buffer, execute/tangle code blocks, and export to HTML."
(interactive)
(let* ((orgfile (buffer-file-name))
(base-name (file-name-base orgfile))
(htmlfile (concat base-name ".html")))
(save-buffer)
(when (derived-mode-p 'org-mode)
(let ((before-save-hook nil))
(save-buffer))
(org-babel-tangle)
(when (file-exists-p htmlfile)
(if (file-newer-than-file-p orgfile htmlfile)
(org-html-export-to-html)
(message "HTML is up to date with Org file"))))))
--8<---------------cut here---------------end--------------->8---
Would it make sense, I can make a video of them side by side...
Best regards.
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-17 15:04 bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs? Fabrice Niessen
@ 2014-10-17 15:41 ` Eli Zaretskii
[not found] ` <86h9z2rb42.fsf-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org>
0 siblings, 1 reply; 14+ messages in thread
From: Eli Zaretskii @ 2014-10-17 15:41 UTC (permalink / raw)
To: Fabrice Niessen; +Cc: 18752
> From: Fabrice Niessen <fni-news@pirilampo.org>
> Date: Fri, 17 Oct 2014 17:04:29 +0200
>
> Maybe the test is partial -- even surely. Though, I wonder why Cygwin
> Emacs is 2 times quicker than its Windows counterpart to tangle an Org
> file, and export it to HTML?
>
> Observations:
>
> - With the Widows binary "GNU Emacs 24.3.94.1 (i686-pc-mingw32) of
> 2014-10-02" (compiled by Dani), it always takes around 2:35.
>
> - With the Cygwin executable "GNU Emacs 24.3.93.1 (i686-pc-cygwin) of
> 2014-08-15", it always just takes around 1:19 for the same operation.
>
> Needless to say: same config file, same Org mode version (8.3beta from
> Git), same machine, etc.
>
> The file I used for the test is my Emacs configuration file, to be found
> on https://github.com/fniessen/emacs-leuven/blob/master/emacs-leuven.txt.
>
> The command I executed, and for which I took the above measures, is:
>
> --8<---------------cut here---------------start------------->8---
> (defun org-save-buffer-and-do-related ()
> "Save buffer, execute/tangle code blocks, and export to HTML."
> (interactive)
> (let* ((orgfile (buffer-file-name))
> (base-name (file-name-base orgfile))
> (htmlfile (concat base-name ".html")))
> (save-buffer)
> (when (derived-mode-p 'org-mode)
> (let ((before-save-hook nil))
> (save-buffer))
> (org-babel-tangle)
> (when (file-exists-p htmlfile)
> (if (file-newer-than-file-p orgfile htmlfile)
> (org-html-export-to-html)
> (message "HTML is up to date with Org file"))))))
> --8<---------------cut here---------------end--------------->8---
You forgot to tell on what OS version was that. You also forgot to
tell what compiler options were used for each build. E.g., if the
Cygwin build is optimized, whereas the MinGW build is not, the twofold
speedup is expected (I generally see a factor of 2.5 between an
optimized and unoptimized build).
Also, showing a profile collected by "M-x profiler-start RET" might
give some clues.
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
[not found] ` <86h9z2rb42.fsf-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org>
@ 2014-10-17 21:08 ` Fabrice Niessen
2014-10-17 22:12 ` Ken Brown
` (2 more replies)
0 siblings, 3 replies; 14+ messages in thread
From: Fabrice Niessen @ 2014-10-17 21:08 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 18752-ubl+/3LiMTaZdePnXv/OxA, cygwin
Eli Zaretskii wrote:
> From: Fabrice Niessen
>>
>> I wonder why Cygwin Emacs is 2 times quicker than its Windows
>> counterpart to tangle an Org file, and export it to HTML?
>>
>> - With the Widows binary "GNU Emacs 24.3.94.1 (i686-pc-mingw32) of
>> 2014-10-02" (compiled by Dani), it always takes around 2:35.
>>
>> - With the Cygwin executable "GNU Emacs 24.3.93.1 (i686-pc-cygwin) of
>> 2014-08-15", it always just takes around 1:19 for the same operation.
>>
>> The command I executed, and for which I took the above measures, is:
>>
>> --8<---------------cut here---------------start------------->8---
>> (defun org-save-buffer-and-do-related ()
>> "Save buffer, execute/tangle code blocks, and export to HTML."
>> (interactive)
>> (let* ((orgfile (buffer-file-name))
>> (base-name (file-name-base orgfile))
>> (htmlfile (concat base-name ".html")))
>> (save-buffer)
>> (when (derived-mode-p 'org-mode)
>> (let ((before-save-hook nil))
>> (save-buffer))
>> (org-babel-tangle)
>> (when (file-exists-p htmlfile)
>> (if (file-newer-than-file-p orgfile htmlfile)
>> (org-html-export-to-html)
>> (message "HTML is up to date with Org file"))))))
>> --8<---------------cut here---------------end--------------->8---
>
> You forgot to tell on what OS version was that.
Windows 8.
> You also forgot to tell what compiler options were used for each
> build. E.g., if the Cygwin build is optimized, whereas the MinGW
> build is not, the twofold speedup is expected (I generally see
> a factor of 2.5 between an optimized and unoptimized build).
I have no idea how Cygwin Emacs gets compiled, nor Windows Emacs (done
by Dani). Putting them in Cc.
> Also, showing a profile collected by "M-x profiler-start RET" might
> give some clues.
Here it is:
--8<---------------cut here---------------start------------->8---
- ... 4223 100%
- #<lambda 0x5b72713> 4117 97%
- org-display-inline-images 4117 97%
- if 4117 97%
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setq 1 0%
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vc-workfile-unchanged-p 1 0%
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message 1 0%
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funcall 2 0%
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funcall 1 0%
--8<---------------cut here---------------end--------------->8---
Best regards,
Fabrice
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-17 21:08 ` Fabrice Niessen
@ 2014-10-17 22:12 ` Ken Brown
2014-10-18 5:42 ` Eli Zaretskii
[not found] ` <83wq7ydjc7.fsf@gnu.org>
2 siblings, 0 replies; 14+ messages in thread
From: Ken Brown @ 2014-10-17 22:12 UTC (permalink / raw)
To: Fabrice Niessen; +Cc: 18752
On 10/17/2014 5:08 PM, Fabrice Niessen wrote:
> I have no idea how Cygwin Emacs gets compiled
The variable 'system-configuration-options' contains that information. Anyway,
the answer is that it's built with optimization -O2.
Ken
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-17 21:08 ` Fabrice Niessen
2014-10-17 22:12 ` Ken Brown
@ 2014-10-18 5:42 ` Eli Zaretskii
[not found] ` <83wq7ydjc7.fsf@gnu.org>
2 siblings, 0 replies; 14+ messages in thread
From: Eli Zaretskii @ 2014-10-18 5:42 UTC (permalink / raw)
To: Fabrice Niessen; +Cc: 18752, cygwin
> From: Fabrice Niessen <fni-news@pirilampo.org>
> Cc: 18752@debbugs.gnu.org, cygwin <cygwin@cygwin.com>, dmoncayo@gmail.com
> Date: Fri, 17 Oct 2014 23:08:51 +0200
>
> > You also forgot to tell what compiler options were used for each
> > build. E.g., if the Cygwin build is optimized, whereas the MinGW
> > build is not, the twofold speedup is expected (I generally see
> > a factor of 2.5 between an optimized and unoptimized build).
>
> I have no idea how Cygwin Emacs gets compiled, nor Windows Emacs (done
> by Dani). Putting them in Cc.
As Ken points out, the variable system-configuration-options is the
way to tell.
Given that the Cygwin build is optimized, it suffices to show that the
MinGW one isn't, to explain the difference in speed.
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
[not found] ` <83wq7ydjc7.fsf-mXXj517/zsQ@public.gmane.org>
@ 2014-10-18 6:51 ` Fabrice Niessen
0 siblings, 0 replies; 14+ messages in thread
From: Fabrice Niessen @ 2014-10-18 6:51 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 18752-ubl+/3LiMTaZdePnXv/OxA, cygwin-rDBXBDvO6BXQT0dZR+AlfA
Eli Zaretskii wrote:
> Fabrice Niessen wrote:
>>
>>> You also forgot to tell what compiler options were used for each
>>> build. E.g., if the Cygwin build is optimized, whereas the MinGW
>>> build is not, the twofold speedup is expected (I generally see
>>> a factor of 2.5 between an optimized and unoptimized build).
>>
>> I have no idea how Cygwin Emacs gets compiled, nor Windows Emacs
>> (done by Dani). Putting them in Cc.
>
> As Ken points out, the variable system-configuration-options is the
> way to tell.
On my Windows Emacs:
"--enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1"
> Given that the Cygwin build is optimized, it suffices to show that the
> MinGW one isn't, to explain the difference in speed.
Dani, can you build an optimized version as well next time?
Thanks!
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
[not found] ` <86zjctlvkv.fsf@example.com>
@ 2014-10-18 7:19 ` Eli Zaretskii
2014-10-18 16:11 ` Dani Moncayo
1 sibling, 0 replies; 14+ messages in thread
From: Eli Zaretskii @ 2014-10-18 7:19 UTC (permalink / raw)
To: Fabrice Niessen; +Cc: 18752, cygwin
> From: Fabrice Niessen <fni-news@pirilampo.org>
> Cc: 18752@debbugs.gnu.org, cygwin@cygwin.com, dmoncayo@gmail.com
> Date: Sat, 18 Oct 2014 08:51:12 +0200
>
> On my Windows Emacs:
>
> "--enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1"
That's an unoptimized build, so the twofold speed difference vs an
optimized build is expected.
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
[not found] ` <86zjctlvkv.fsf@example.com>
2014-10-18 7:19 ` Eli Zaretskii
@ 2014-10-18 16:11 ` Dani Moncayo
2014-10-18 16:17 ` Eli Zaretskii
1 sibling, 1 reply; 14+ messages in thread
From: Dani Moncayo @ 2014-10-18 16:11 UTC (permalink / raw)
To: Fabrice Niessen; +Cc: 18752
> Dani, can you build an optimized version as well next time?
I could, yes. But before, I'd like to understand what are the
advantages and drawbacks of optimized vs unoptimized builds. Could
someone explain that to me, or tell me where could I read that
information?
Also, what should I do to produce an optimized build? "nt/INSTALL"
shows an example of how to configure an unoptimized build, but there
is no example for an optimized one. How about adding that lacking
example to the file?
--
Dani Moncayo
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-18 16:11 ` Dani Moncayo
@ 2014-10-18 16:17 ` Eli Zaretskii
2014-10-18 16:25 ` Dani Moncayo
` (2 more replies)
0 siblings, 3 replies; 14+ messages in thread
From: Eli Zaretskii @ 2014-10-18 16:17 UTC (permalink / raw)
To: Dani Moncayo; +Cc: 18752, fni-news
> Date: Sat, 18 Oct 2014 18:11:53 +0200
> From: Dani Moncayo <dmoncayo@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, 18752@debbugs.gnu.org
>
> > Dani, can you build an optimized version as well next time?
>
> I could, yes. But before, I'd like to understand what are the
> advantages and drawbacks of optimized vs unoptimized builds. Could
> someone explain that to me, or tell me where could I read that
> information?
Unoptimized builds make debugging easier, but are about 2 - 2.5 times
slower than optimized ones. For that reason, the usual practice is to
produce unoptimized builds for snapshots and pretests, but optimized
ones for official releases.
Latest GCC versions support a -Og optimization switch that gives you
the best of both worlds.
> Also, what should I do to produce an optimized build? "nt/INSTALL"
> shows an example of how to configure an unoptimized build, but there
> is no example for an optimized one. How about adding that lacking
> example to the file?
If you drop the "CFLAGS=" part, you get an optimized build by
default. The example of that is already in nt/INSTALL, even before
the one that shows how to pass non-default CFLAGS.
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-18 16:17 ` Eli Zaretskii
@ 2014-10-18 16:25 ` Dani Moncayo
2014-10-18 17:35 ` Ken Brown
2014-10-18 19:25 ` Stefan Monnier
2 siblings, 0 replies; 14+ messages in thread
From: Dani Moncayo @ 2014-10-18 16:25 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 18752
>> I'd like to understand what are the
>> advantages and drawbacks of optimized vs unoptimized builds. Could
>> someone explain that to me, or tell me where could I read that
>> information?
>
> Unoptimized builds make debugging easier, but are about 2 - 2.5 times
> slower than optimized ones. For that reason, the usual practice is to
> produce unoptimized builds for snapshots and pretests, but optimized
> ones for official releases.
>
> Latest GCC versions support a -Og optimization switch that gives you
> the best of both worlds.
>
>> Also, what should I do to produce an optimized build? "nt/INSTALL"
>> shows an example of how to configure an unoptimized build, but there
>> is no example for an optimized one. How about adding that lacking
>> example to the file?
>
> If you drop the "CFLAGS=" part, you get an optimized build by
> default. The example of that is already in nt/INSTALL, even before
> the one that shows how to pass non-default CFLAGS.
Thank you.
--
Dani Moncayo
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-18 16:17 ` Eli Zaretskii
2014-10-18 16:25 ` Dani Moncayo
@ 2014-10-18 17:35 ` Ken Brown
2014-10-18 17:46 ` Eli Zaretskii
2014-10-18 19:25 ` Stefan Monnier
2 siblings, 1 reply; 14+ messages in thread
From: Ken Brown @ 2014-10-18 17:35 UTC (permalink / raw)
To: Eli Zaretskii, Dani Moncayo; +Cc: 18752, fni-news
On 10/18/2014 12:17 PM, Eli Zaretskii wrote:
> Unoptimized builds make debugging easier, but are about 2 - 2.5 times
> slower than optimized ones. For that reason, the usual practice is to
> produce unoptimized builds for snapshots and pretests, but optimized
> ones for official releases.
>
> Latest GCC versions support a -Og optimization switch that gives you
> the best of both worlds.
Do you happen to know how much of a performance difference there typically is
between -Og and -O2?
Ken
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-18 17:35 ` Ken Brown
@ 2014-10-18 17:46 ` Eli Zaretskii
0 siblings, 0 replies; 14+ messages in thread
From: Eli Zaretskii @ 2014-10-18 17:46 UTC (permalink / raw)
To: Ken Brown; +Cc: 18752, fni-news
> Date: Sat, 18 Oct 2014 13:35:48 -0400
> From: Ken Brown <kbrown@cornell.edu>
> CC: 18752@debbugs.gnu.org, fni-news@pirilampo.org
>
> On 10/18/2014 12:17 PM, Eli Zaretskii wrote:
> > Unoptimized builds make debugging easier, but are about 2 - 2.5 times
> > slower than optimized ones. For that reason, the usual practice is to
> > produce unoptimized builds for snapshots and pretests, but optimized
> > ones for official releases.
> >
> > Latest GCC versions support a -Og optimization switch that gives you
> > the best of both worlds.
>
> Do you happen to know how much of a performance difference there typically is
> between -Og and -O2?
No; measurements welcome.
Personally, I'd be surprised to see more than a few percents of
difference for Emacs.
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-18 16:17 ` Eli Zaretskii
2014-10-18 16:25 ` Dani Moncayo
2014-10-18 17:35 ` Ken Brown
@ 2014-10-18 19:25 ` Stefan Monnier
2014-10-18 19:34 ` Eli Zaretskii
2 siblings, 1 reply; 14+ messages in thread
From: Stefan Monnier @ 2014-10-18 19:25 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 18752, fni-news
> Latest GCC versions support a -Og optimization switch that gives you
> the best of both worlds.
FWIW, I use "-Og -g3" and the result is not exactly the best of both
worlds in my view: I still constantly get "variable optimized away"
messages in GDB. But at least, the info I do get from GDB seems
usually correct.
Stefan
^ permalink raw reply [flat|nested] 14+ messages in thread* bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?
2014-10-18 19:25 ` Stefan Monnier
@ 2014-10-18 19:34 ` Eli Zaretskii
0 siblings, 0 replies; 14+ messages in thread
From: Eli Zaretskii @ 2014-10-18 19:34 UTC (permalink / raw)
To: Stefan Monnier; +Cc: 18752, fni-news
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Dani Moncayo <dmoncayo@gmail.com>, 18752@debbugs.gnu.org, fni-news@pirilampo.org
> Date: Sat, 18 Oct 2014 15:25:15 -0400
>
> I still constantly get "variable optimized away" messages in GDB.
Nothing can be done about this, given the complexity of DWARF and
compiler/debugger bugs in implementing its dark corners.
The problem with debugging -O2 code is that you cannot trust
backtraces, and cannot set breakpoints and be sure they will break.
This doesn't happen with -Og.
^ permalink raw reply [flat|nested] 14+ messages in threadend of thread, other threads:[~2014-10-18 19:34 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-10-17 15:04 bug#18752: 24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs? Fabrice Niessen
2014-10-17 15:41 ` Eli Zaretskii
[not found] ` <86h9z2rb42.fsf-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org>
2014-10-17 21:08 ` Fabrice Niessen
2014-10-17 22:12 ` Ken Brown
2014-10-18 5:42 ` Eli Zaretskii
[not found] ` <83wq7ydjc7.fsf@gnu.org>
[not found] ` <83wq7ydjc7.fsf-mXXj517/zsQ@public.gmane.org>
2014-10-18 6:51 ` Fabrice Niessen
[not found] ` <86zjctlvkv.fsf@example.com>
2014-10-18 7:19 ` Eli Zaretskii
2014-10-18 16:11 ` Dani Moncayo
2014-10-18 16:17 ` Eli Zaretskii
2014-10-18 16:25 ` Dani Moncayo
2014-10-18 17:35 ` Ken Brown
2014-10-18 17:46 ` Eli Zaretskii
2014-10-18 19:25 ` Stefan Monnier
2014-10-18 19:34 ` Eli Zaretskii
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