* Re: 78% speed up in CC Mode scrolling. [not found] <20160703182957.GA4923@acm.fritz.box> @ 2016-07-03 19:27 ` Eli Zaretskii 2016-07-03 19:39 ` Alan Mackenzie 2016-07-07 16:17 ` 78% speed up in CC Mode scrolling martin rudalics 1 sibling, 1 reply; 5+ messages in thread From: Eli Zaretskii @ 2016-07-03 19:27 UTC (permalink / raw) To: Alan Mackenzie; +Cc: rudalics, johnw, emacs-devel > Date: Sun, 3 Jul 2016 18:29:57 +0000 > From: Alan Mackenzie <acm@muc.de> > > Scrolling through emacs-25's xdisp.c, I get the following timings: > emacs-25 branch: 45.529s > master branch: 25.529s > > This is a speedup of around 78%. Please show your benchmark code, and please tell which compiler options were used to build Emacs. Otherwise, I don't know how to reproduce this. > If you frequently hold down C-v or M-v, you are recommended to set > `fast-but-imprecise-scrolling' to non-nil. What does this recommendation have to do with the speedup? Thanks. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: 78% speed up in CC Mode scrolling. 2016-07-03 19:27 ` 78% speed up in CC Mode scrolling Eli Zaretskii @ 2016-07-03 19:39 ` Alan Mackenzie 2016-07-05 9:27 ` Benchmarking (was: 78% speed up in CC Mode scrolling.) Nicolas Richard 0 siblings, 1 reply; 5+ messages in thread From: Alan Mackenzie @ 2016-07-03 19:39 UTC (permalink / raw) To: Eli Zaretskii; +Cc: rudalics, johnw, emacs-devel Hello, Eli. On Sun, Jul 03, 2016 at 10:27:54PM +0300, Eli Zaretskii wrote: > > Date: Sun, 3 Jul 2016 18:29:57 +0000 > > From: Alan Mackenzie <acm@muc.de> > > Scrolling through emacs-25's xdisp.c, I get the following timings: > > emacs-25 branch: 45.529s > > master branch: 25.529s > > This is a speedup of around 78%. > Please show your benchmark code, and please tell which compiler > options were used to build Emacs. Otherwise, I don't know how to > reproduce this. (defmacro time-it (&rest forms) "Time the running of a sequence of forms using `float-time'. Call like this: \"M-: (time-it (foo ...) (bar ...) ...)\"." `(let ((start (float-time))) ,@forms (- (float-time) start))) (defun time-scroll (&optional arg) (interactive "P") (message "%s" (time-it (condition-case nil (while t (if arg (scroll-down) (scroll-up)) (sit-for 0)) (error nil))))) Do C-x C-f ..../src/xdisp.c, then without scrolling it otherwise, M-: (time-scroll). My measurements were done on a Linux virtual tty. My .configure options were: ./configure --with-tiff=no --with-gif=no --with-gpm . The default values of CFLAGS, etc., were used. > > If you frequently hold down C-v or M-v, you are recommended to set > > `fast-but-imprecise-scrolling' to non-nil. > What does this recommendation have to do with the speedup? Nothing, really. But it seemed relevant, perhaps for people running at low levels of compiler optimisation. > Thanks. -- Alan Mackenzie (Nuremberg, Germany). ^ permalink raw reply [flat|nested] 5+ messages in thread
* Benchmarking (was: 78% speed up in CC Mode scrolling.) 2016-07-03 19:39 ` Alan Mackenzie @ 2016-07-05 9:27 ` Nicolas Richard 0 siblings, 0 replies; 5+ messages in thread From: Nicolas Richard @ 2016-07-05 9:27 UTC (permalink / raw) To: emacs-devel Hello, Alan Mackenzie <acm@muc.de> writes: > (defmacro time-it (&rest forms) > "Time the running of a sequence of forms using `float-time'. > Call like this: \"M-: (time-it (foo ...) (bar ...) ...)\"." > `(let ((start (float-time))) > ,@forms > (- (float-time) start))) FWIW there's a macro called benchmark-run for this kind of job, and there's also an interactive version: M-x benchmark -- Nicolas ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: 78% speed up in CC Mode scrolling. [not found] <20160703182957.GA4923@acm.fritz.box> 2016-07-03 19:27 ` 78% speed up in CC Mode scrolling Eli Zaretskii @ 2016-07-07 16:17 ` martin rudalics 2016-07-07 19:20 ` Alan Mackenzie 1 sibling, 1 reply; 5+ messages in thread From: martin rudalics @ 2016-07-07 16:17 UTC (permalink / raw) To: Alan Mackenzie, emacs-devel [-- Attachment #1: Type: text/plain, Size: 801 bytes --] > Scrolling through emacs-25's xdisp.c, I get the following timings: > emacs-25 branch: 45.529s > master branch: 25.529s > > This is a speedup of around 78%. Thank you. Using the attached test2.el on frame.c, I get the following results for emacs -Q (‘foofoo’ scrolls up profiling ‘foo-1’, ‘foobar’ scrolls down profiling ‘bar-1’). emacs-25: Call Count Elapsed Time Average Time foo-1 169 109.15699999 0.6458994082 bar-1 169 113.032 0.6688284023 master: foo-1 169 45.28100000 0.2679349112 bar-1 169 53.406 0.3160118343 These look even better than yours (I have no idea which formula you used to derive a speedup of "78%" though). martin [-- Attachment #2: test2.el --] [-- Type: application/emacs-lisp, Size: 663 bytes --] ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: 78% speed up in CC Mode scrolling. 2016-07-07 16:17 ` 78% speed up in CC Mode scrolling martin rudalics @ 2016-07-07 19:20 ` Alan Mackenzie 0 siblings, 0 replies; 5+ messages in thread From: Alan Mackenzie @ 2016-07-07 19:20 UTC (permalink / raw) To: martin rudalics; +Cc: emacs-devel Hello, Martin. On Thu, Jul 07, 2016 at 06:17:32PM +0200, martin rudalics wrote: > > Scrolling through emacs-25's xdisp.c, I get the following timings: > > emacs-25 branch: 45.529s > > master branch: 25.529s > > This is a speedup of around 78%. > Thank you. Using the attached test2.el on frame.c, I get the following > results for emacs -Q (‘foofoo’ scrolls up profiling ‘foo-1’, ‘foobar’ > scrolls down profiling ‘bar-1’). > emacs-25: > Call Count Elapsed Time Average Time > foo-1 169 109.15699999 0.6458994082 > bar-1 169 113.032 0.6688284023 > master: > foo-1 169 45.28100000 0.2679349112 > bar-1 169 53.406 0.3160118343 > These look even better than yours (I have no idea which formula you used > to derive a speedup of "78%" though). Simply 45.529 / 25.529 = 1.78. In your timings I see a speed increase of 141% and 112% respectively. It'd be nice if your results were more typical than mine. What is pure coincidence (I hope) is how similar the digits in my two timings were. > martin -- Alan Mackenzie (Nuremberg, Germany). ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-07-07 19:20 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- [not found] <20160703182957.GA4923@acm.fritz.box> 2016-07-03 19:27 ` 78% speed up in CC Mode scrolling Eli Zaretskii 2016-07-03 19:39 ` Alan Mackenzie 2016-07-05 9:27 ` Benchmarking (was: 78% speed up in CC Mode scrolling.) Nicolas Richard 2016-07-07 16:17 ` 78% speed up in CC Mode scrolling martin rudalics 2016-07-07 19:20 ` Alan Mackenzie
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