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bug#15841: Display bugs with cache-long-lines non-nil
From: |
Michael Heerdegen |
Subject: |
bug#15841: Display bugs with cache-long-lines non-nil |
Date: |
Mon, 11 Nov 2013 04:39:56 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
> > Anyway, I'll tell you when I have a recipe.
Some elaborations, feel free to ignore.
The culprit was my own code: it placed myriads of invisible overlays
with no properties into the buffer. Under these extreme circumstances,
`line-number-at-pos' indeed gets extremely slow at the end of my 10000
lines buffer: one invocation needs over a second. I saw that with elp
as well as with profiler. Setting `cache-long-scans' to nil (or
removing the overlays) cures this.
Although this is a corner case, I wonder why overlays slow down
`line-number-at-pos' so much for `cache-long-scans' non-nil - is that
expected? Or can the profiler times I saw span redisplay times?
Because, when I use this:
(defmacro my-measure-time (expr)
"Eval EXPR, display how much time it took."
(with-gensyms (time)
`(let ((,time (current-time)))
,expr
(message "%s secs"
(float-time (time-subtract (current-time) ,time))))))
and evaluate (my-measure-time (line-number-at-pos)) manually with M-:
(in the same situation), it shows a very tiny value. But I'm sure that
from code, `line-number-at-pos' really lasts over a second. Strange, I
don't understand it.
Regards,
Michael.
- bug#15797: 24.3.50; Info: Mention cache-long-scans, (continued)
- bug#15797: 24.3.50; Info: Mention cache-long-scans, Glenn Morris, 2013/11/08
- bug#15797: 24.3.50; Info: Mention cache-long-scans, Michael Heerdegen, 2013/11/08
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Michael Heerdegen, 2013/11/10
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/10
- bug#15841: Display bugs with cache-long-lines non-nil,
Michael Heerdegen <=
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/11
- bug#15841: Display bugs with cache-long-lines non-nil, Michael Heerdegen, 2013/11/13
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/13
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/09
- bug#15841: Display bugs with cache-long-lines non-nil, Stephen Berman, 2013/11/11
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/11
- bug#15841: Display bugs with cache-long-lines non-nil, Stephen Berman, 2013/11/11
- bug#15841: Display bugs with cache-long-lines non-nil, Stephen Berman, 2013/11/11
- bug#15841: Display bugs with cache-long-lines non-nil, Stephen Berman, 2013/11/12
- bug#15841: Display bugs with cache-long-lines non-nil, Eli Zaretskii, 2013/11/12