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Re: Low redisplay performance (23 regression)
From: |
Stefan Monnier |
Subject: |
Re: Low redisplay performance (23 regression) |
Date: |
Wed, 29 Apr 2009 09:33:12 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.92 (gnu/linux) |
> GNU Emacs 22.1.1 --> (4.323907 2 0.07007399999999997)
> GNU Emacs 23.0.60.1 --> (7.5862680000000005 1 0.048462000000000005)
> GNU Emacs 23.0.92.1 --> (7.610763 2 0.06742599999999999)
> (built on 2009-04-29)
So it's about twice as slow for this test, which is the expected in this
case: since your benchmark always calls it with point between 2 defuns,
it ends up doing: BOD-raw to find the previous defun, EOD-function to
find its end, which tells Emacs that the starting point was after the
previous defun, so it calls BOD-raw again to find the next defun and
finally EOD-function to get to its end.
> As I use `end-of-defun' in my customized
> `font-lock-extend-region-functions' this does have an impact on the
> overall performance of fontification for me on large files.
I don't think the size of the file (aka buffer) should make
a difference. And I can't think of a good reason why EOD should take
a non-negligible amount of time compared to running
font-lock-fontify-region on a whole defun at a time.
> What is the reason that `end-of-defun' is an _order of magnitude_ slower
> than `beginning-of-defun'?
Because EOD uses BOD internally, I guess. Of course in your
font-lock-extend-region-functions, you may simply prefer to use BOD
rather than EOD.
Stefan
- Re: ftx font driver [Re: Low redisplay performance (23 regression)], (continued)
- Re: Low redisplay performance (23 regression), Deniz Dogan, 2009/04/20
- Re: Low redisplay performance (23 regression), William Xu, 2009/04/21
- Re: Low redisplay performance (23 regression), Tobias C. Rittweiler, 2009/04/29
- Re: Low redisplay performance (23 regression), David Reitter, 2009/04/29
- Re: Low redisplay performance (23 regression),
Stefan Monnier <=
- Re: Low redisplay performance (23 regression), Tobias C. Rittweiler, 2009/04/29
- Re: Low redisplay performance (23 regression), Stefan Monnier, 2009/04/29
- Re: Low redisplay performance (23 regression), Tobias C. Rittweiler, 2009/04/30
- Re: Low redisplay performance (23 regression), Stefan Monnier, 2009/04/30
- Re: Low redisplay performance (23 regression), Tobias C. Rittweiler, 2009/04/30
- Re: Low redisplay performance (23 regression), Tobias C. Rittweiler, 2009/04/29
- Re: Low redisplay performance (23 regression), Chong Yidong, 2009/04/30
- Re: Low redisplay performance (23 regression), Tassilo Horn, 2009/04/29