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Re: M-x grep is too slow
From: |
Kim F. Storm |
Subject: |
Re: M-x grep is too slow |
Date: |
16 Jul 2004 16:51:04 +0200 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 |
Stefan Monnier <address@hidden> writes:
> > I tried the above but it finished quite soon. But, when I tried:
> > M-x grep -nH -e while emacs/lisp/*/*.el
> > it took long time.
>
> I see it also. Grep's output at first comes in fast and then at some point
> it abruptly slows down and then it only comes in a couple chars at a time
> (with enough time inbetween to see the steps). Later on it switched again
> to "fast" mode, and then switched again to "slow" mode, etc...
I don't see it (GNU/Linux (redhat9), 1.4 GHz uni-processor)
But it does run SLOOOOW... In my case, approx 50-70 lines are added per screen
update.
>
> The problem is not the time taken in font-lock, but the fact that the text
> gets inserted one char at a time (or maybe 2 or 3 chars, but it should not
> happen that way; and as a matter of fact it does not happen that way when
> grep's output comes in fast).
Well, font-lock definitely makes this A LOT slower...
Looking with a debugger, a lot of time is spent in
previous-single-property-change.
Maybe caching the last position of 'directory and 'message properties
would make a difference ?
Try this little patch:
*** compile.el 20 Jun 2004 20:59:24 +0200 1.322
--- compile.el 16 Jul 2004 16:14:19 +0200
***************
*** 1200,1206 ****
(turn-on-font-lock))
(turn-on-font-lock))
;; maybe defer font-lock till after derived mode is set up
! (run-mode-hooks 'compilation-turn-on-font-lock))))
;;;###autoload
(define-minor-mode compilation-shell-minor-mode
--- 1200,1207 ----
(turn-on-font-lock))
(turn-on-font-lock))
;; maybe defer font-lock till after derived mode is set up
! ;(run-mode-hooks 'compilation-turn-on-font-lock)
! )))
;;;###autoload
(define-minor-mode compilation-shell-minor-mode
With that, grep runs FAST.
>
> It seems related to the problem David had with AUCTeX on uniprocessors
> running the Linux kernel with the "interactive" scheduler. Kim installed
> a patch to fix it, but maybe the patch isn't doing its job here for
> some reason.
If I set process-adaptive-read-buffering to nil this runs even slower for
me, but it still finishes in a couple of minutes...
--
Kim F. Storm <address@hidden> http://www.cua.dk
- Re: M-x grep is too slow, Richard Stallman, 2004/07/12
- Re: M-x grep is too slow, Kenichi Handa, 2004/07/12
- Re: M-x grep is too slow, Eli Zaretskii, 2004/07/13
- Re: M-x grep is too slow, Stefan Monnier, 2004/07/13
- Re: M-x grep is too slow,
Kim F. Storm <=
- Re: M-x grep is too slow, Richard Stallman, 2004/07/17
- Re: M-x grep is too slow, Kim F. Storm, 2004/07/19
- Re: M-x grep is too slow, Richard Stallman, 2004/07/20
- Re: M-x grep is too slow, Kim F. Storm, 2004/07/21
- Re: M-x grep is too slow, Richard Stallman, 2004/07/22
Re: M-x grep is too slow, Richard Stallman, 2004/07/13
Re: M-x grep is too slow, Richard Stallman, 2004/07/13