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From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
To: Ihor Radchenko <yantar92@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: [patch suggestion] Mitigating the poor Emacs performance on huge org files: Do not use overlays for PROPERTY and LOGBOOK drawers
Date: Fri, 05 Jun 2020 09:26:31 +0200	[thread overview]
Message-ID: <87r1uuotw8.fsf@nicolasgoaziou.fr> (raw)
In-Reply-To: <87367d4ydc.fsf@localhost> (Ihor Radchenko's message of "Tue, 02 Jun 2020 17:21:03 +0800")

Hello,

Ihor Radchenko <yantar92@gmail.com> writes:

> [The patch itself will be provided in the following email]

Thank you.

> I have found char-property-alias-alist variable that controls how Emacs
> calculates text property value if the property is not set. This variable
> can be buffer-local, which allows independent 'invisible states in
> different buffers.

Great. I didn't know about this variable!

> All the implementation stays in
> org--get-buffer-local-text-property-symbol, which takes care about
> generating unique property name and mapping it to 'invisible (or any
> other) text property.

See also `gensym'. Do we really need to use it for something else than
`invisible'? If not, the tool doesn't need to be generic.

> I simplified the code as suggested, without using pairs of before- and
> after-change-functions.

Great!

> Handling text inserted into folded/invisible region is handled by a
> simple after-change function. After testing, it turned out that simple
> re-hiding text based on 'invisible property of the text before/after the
> inserted region works pretty well.

OK, but this may not be sufficient if we want to do slightly better than
overlays in that area. This is not mandatory, though.

> Modifications to BEGIN/END line of the drawers and blocks is handled via
> 'modification-hooks + 'insert-behind-hooks text properties (there is no
> after-change-functions analogue for text properties in Emacs). The
> property is applied during folding and the modification-hook function is
> made aware about the drawer/block boundaries (via apply-partially
> passing element containing :begin :end markers for the current
> drawer/block). Passing the element boundary is important because the
> 'modification-hook will not directly know where it belongs to. Only the
> modified region (which can be larger than the drawer) is passed to the
> function. In the worst case, the region can be the whole buffer (if one
> runs revert-buffer).

As discussed before, I don't think you need to use `modification-hooks'
or `insert-behind-hooks' if you already use `after-change-functions'.

`after-change-functions' are also triggered upon text properties
changes. So, what is the use case for the other hooks?

> It turned out that adding 'modification-hook text property takes a
> significant cpu time (partially, because we need to take care about
> possible existing 'modification-hook value, see
> org--add-to-list-text-property). For now, I decided to not clear the
> modification hooks during unfolding because of poor performance.
> However, this approach would lead to partial unfolding in the following
> case:
>
> :asd:
> :drawer:
> lksjdfksdfjl
> sdfsdfsdf
> :end:
>
> If :asd: was inserted in front of folded :drawer:, changes in :drawer:
> line of the new folded :asd: drawer would reveal the text between
> :drawer: and :end:.
>
> Let me know what you think on this.

I have first to understand the use case for `modification-hook'. But
I think unfolding is the right thing to do in this situation, isn't it?

> My simplified implementation of element boundary parser
> (org--get-element-region-at-point) appears to be much faster and also
> uses much less memory in comparison with org-element-at-point.
> Moreover, not all the places where org-element-at-point is called
> actually need the full parsed element. For example, org-hide-drawer-all,
> org-hide-drawer-toggle, org-hide-block-toggle, and
> org--hide-wrapper-toggle only need element type and some information
> about the element boundaries - the information we can get from
> org--get-element-region-at-point.

[...]

> What do you think about the idea of making use of
> org--get-element-region-at-point in org code base?

`org--get-element-region-at-point' is certainly faster, but it is also
wrong, unfortunately.

Org syntax is not context-free grammar. If you try to parse it locally,
starting from anywhere, it will fail at some point. For example, your
function would choke in the following case:

    [fn:1] Def1
    #+begin_something

    [fn:2] Def2
    #+end_something

AFAIK, the only proper way to parse it is to start from a known position
in the buffer. If you have no information about the buffer, the headline
above is the position you want. With cache could help to start below.
Anyway, in this particular case, you should not use
`org--get-element-region-at-point'.

Hopefully, we don't need to parse anything. In an earlier message,
I suggested a few checks to make on the modified text in order to decide
if something should be unfolded, or not. I suggest to start from there,
and fix any shortcomings we might encounter. We're replacing overlays:
low-level is good in this area.

WDYT?


Regards,

-- 
Nicolas Goaziou


  parent reply	other threads:[~2020-06-05  7:27 UTC|newest]

Thread overview: 187+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-24  6:55 Ihor Radchenko
2020-04-24  8:02 ` Nicolas Goaziou
2020-04-25  0:29   ` stardiviner
2020-04-26 16:04   ` Ihor Radchenko
2020-05-04 16:56     ` Karl Voit
2020-05-07  7:18       ` Karl Voit
2020-05-09 15:43       ` Ihor Radchenko
2020-05-07 11:04     ` Christian Heinrich
2020-05-09 15:46       ` Ihor Radchenko
2020-05-08 16:38     ` Nicolas Goaziou
2020-05-09 13:58       ` Nicolas Goaziou
2020-05-09 16:22         ` Ihor Radchenko
2020-05-09 17:21           ` Nicolas Goaziou
2020-05-10  5:25             ` Ihor Radchenko
2020-05-10  9:47               ` Nicolas Goaziou
2020-05-10 13:29                 ` Ihor Radchenko
2020-05-10 14:46                   ` Nicolas Goaziou
2020-05-10 16:21                     ` Ihor Radchenko
2020-05-10 16:38                       ` Nicolas Goaziou
2020-05-10 17:08                         ` Ihor Radchenko
2020-05-10 19:38                           ` Nicolas Goaziou
2020-05-09 15:40       ` Ihor Radchenko
2020-05-09 16:30         ` Ihor Radchenko
2020-05-09 17:32           ` Nicolas Goaziou
2020-05-09 18:06             ` Ihor Radchenko
2020-05-10 14:59               ` Nicolas Goaziou
2020-05-10 15:15                 ` Kyle Meyer
2020-05-10 16:30                 ` Ihor Radchenko
2020-05-10 19:32                   ` Nicolas Goaziou
2020-05-12 10:03                     ` Nicolas Goaziou
2020-05-17 15:00                     ` Ihor Radchenko
2020-05-17 15:40                       ` Ihor Radchenko
2020-05-18 14:35                         ` Nicolas Goaziou
2020-05-18 16:52                           ` Ihor Radchenko
2020-05-19 13:07                             ` Nicolas Goaziou
2020-05-23 13:52                               ` Ihor Radchenko
2020-05-23 13:53                                 ` Ihor Radchenko
2020-05-23 15:26                                   ` Ihor Radchenko
2020-05-26  8:33                                 ` Nicolas Goaziou
2020-06-02  9:21                                   ` Ihor Radchenko
2020-06-02  9:23                                     ` Ihor Radchenko
2020-06-02 12:10                                       ` Bastien
2020-06-02 13:12                                         ` Ihor Radchenko
2020-06-02 13:23                                           ` Bastien
2020-06-02 13:30                                             ` Ihor Radchenko
2020-06-02  9:25                                     ` Ihor Radchenko
2020-06-05  7:26                                     ` Nicolas Goaziou [this message]
2020-06-05  8:18                                       ` Ihor Radchenko
2020-06-05 13:50                                         ` Nicolas Goaziou
2020-06-08  5:05                                           ` Ihor Radchenko
2020-06-08  5:06                                             ` Ihor Radchenko
2020-06-08  5:08                                             ` Ihor Radchenko
2020-06-10 17:14                                             ` Nicolas Goaziou
2020-06-21  9:52                                               ` Ihor Radchenko
2020-06-21 15:01                                                 ` Nicolas Goaziou
2020-08-11  6:45                                               ` Ihor Radchenko
2020-08-11 23:07                                                 ` Kyle Meyer
2020-08-12  6:29                                                   ` Ihor Radchenko
2020-09-20  5:53                                                     ` Ihor Radchenko
2020-09-20 11:45                                                       ` Kévin Le Gouguec
2020-09-22  9:05                                                         ` Ihor Radchenko
2020-09-22 10:00                                                           ` Ihor Radchenko
2020-09-23  6:16                                                             ` Kévin Le Gouguec
2020-09-23  6:48                                                               ` Ihor Radchenko
2020-09-23  7:09                                                                 ` Bastien
2020-09-23  7:30                                                                   ` Ihor Radchenko
2020-09-24 18:07                                                                 ` Kévin Le Gouguec
2020-09-25  2:16                                                                   ` Ihor Radchenko
2020-12-15 17:38                                                                     ` [9.4] Fixing logbook visibility during isearch Kévin Le Gouguec
2020-12-16  3:15                                                                       ` Ihor Radchenko
2020-12-16 18:05                                                                         ` Kévin Le Gouguec
2020-12-17  3:18                                                                           ` Ihor Radchenko
2020-12-17 14:50                                                                             ` Kévin Le Gouguec
2020-12-18  2:23                                                                               ` Ihor Radchenko
2020-12-24 23:37                                                                                 ` Kévin Le Gouguec
2020-12-25  2:51                                                                                   ` Ihor Radchenko
2020-12-25 10:59                                                                                     ` Kévin Le Gouguec
2020-12-25 12:32                                                                                       ` Ihor Radchenko
2020-12-25 21:35                                                                                     ` Kévin Le Gouguec
2020-12-26  4:14                                                                                       ` Ihor Radchenko
2020-12-26 11:44                                                                                         ` Kévin Le Gouguec
2020-12-26 12:22                                                                                           ` Ihor Radchenko
2020-12-04  5:58                                                       ` [patch suggestion] Mitigating the poor Emacs performance on huge org files: Do not use overlays for PROPERTY and LOGBOOK drawers Ihor Radchenko
2021-03-21  9:09                                                         ` Ihor Radchenko
2021-05-03 17:28                                                           ` Bastien
2021-09-21 13:32                                                             ` Timothy
2021-10-26 17:25                                                               ` Matt Price
2021-10-27  6:27                                                                 ` Ihor Radchenko
2022-01-29 11:37                                                             ` [PATCH 00/35] Merge org-fold feature branch Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 01/35] Add org-fold-core: new folding engine Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 02/35] Separate folding functions from org.el into new library: org-fold Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 03/35] Separate cycling functions from org.el into new library: org-cycle Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 04/35] Remove functions from org.el that are now moved elsewhere Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 05/35] Disable native-comp in agenda Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 06/35] org-macs: New function org-find-text-property-region Ihor Radchenko
2022-01-29 11:37                                                               ` [PATCH 07/35] org-at-heading-p: Accept optional argument Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 08/35] org-string-width: Reimplement to work with new folding Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 09/35] Rename old function call to use org-fold Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 10/35] Implement link folding Ihor Radchenko
2022-05-04  6:13                                                                 ` [BUG] 67275f4 broke evil-search " Tom Gillespie
2022-05-04  6:38                                                                   ` Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 11/35] Implement overlay- and text-property-based versions of some functions Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 12/35] org-fold: Handle indirect buffer visibility Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 13/35] Fix subtle differences between overlays and invisible text properties Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 14/35] Support extra org-fold optimisations for huge buffers Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 15/35] Alias new org-fold functions to their old shorter names Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 16/35] Obsolete old function names that are now in org-fold Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 17/35] org-compat: Work around some third-party packages using outline-* functions Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 18/35] Move `org-buffer-list' to org-macs.el Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 19/35] Restore old visibility behaviour of org-refile Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 20/35] Add org-fold-related tests Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 21/35] org-manual: Update to new org-fold function names Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 22/35] ORG-NEWS: Add list of changes Ihor Radchenko
2022-01-29 20:31                                                                 ` New folding backend & outline (was: [PATCH 22/35] ORG-NEWS: Add list of changes) Kévin Le Gouguec
2022-01-30  2:15                                                                   ` Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 23/35] Backport contributed commits Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 24/35] Fix typo: delete-duplicates → delete-dups Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 25/35] Fix bug in org-get-heading Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 26/35] Rename remaining org-force-cycle-archived → org-cycle-force-archived Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 27/35] Fix org-fold--hide-drawers--overlays Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 28/35] org-string-width: Handle undefined behaviour in older Emacs Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 29/35] org-string-width: Work around `window-pixel-width' bug in old Emacs Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 30/35] org-fold-show-set-visibility: Fix edge case when folded region is at BOB Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 31/35] org-fold-core: Fix fontification inside folded regions Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 32/35] test-org/string-width: Add tests for strings with prefix properties Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 33/35] org--string-from-props: Fix handling folds in Emacs <28 Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 34/35] org-link-make-string: Throw error when both LINK and DESCRIPTION are empty Ihor Radchenko
2022-01-29 11:38                                                               ` [PATCH 35/35] test-ol/org-toggle-link-display: Fix compatibility with old Emacs Ihor Radchenko
2022-02-03  6:27                                                               ` [PATCH 00/35] Merge org-fold feature branch Bastien
2022-02-03  7:07                                                                 ` Ihor Radchenko
2022-04-20 13:23                                                                   ` [PATCH v2 00/38] Final call for comments: " Ihor Radchenko
2022-04-20 13:23                                                                     ` [PATCH v2 01/38] Add org-fold-core: new folding engine--- Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 02/38] Separate folding functions from org.el into new library: org-fold Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 03/38] Separate cycling functions from org.el into new library: org-cycle Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 04/38] Remove functions from org.el that are now moved elsewhere Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 05/38] Disable native-comp in agendaIt caused cryptic bugs in the past Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 06/38] org-macs: New function org-find-text-property-region--- Ihor Radchenko
2022-04-20 13:24                                                                     ` [PATCH v2 07/38] org-at-heading-p: Accept optional argument* lisp/org.el (org-at-heading-p): Use second argument to allow Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 08/38] org-string-width: Reimplement to work with new folding Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 09/38] Rename old function call to use org-fold--- Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 10/38] Implement link folding* lisp/ol.el (org-link--link-folding-spec): Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 11/38] Implement overlay- and text-property-based versions of some functions Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 12/38] org-fold: Handle indirect buffer visibility--- Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 13/38] Fix subtle differences between overlays and invisible text properties Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 14/38] Support extra org-fold optimisations for huge buffers Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 15/38] Alias new org-fold functions to their old shorter names Ihor Radchenko
2022-04-20 13:25                                                                     ` [PATCH v2 16/38] Obsolete old function names that are now in org-fold--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 17/38] org-compat: Work around some third-party packages using outline-* functions Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 18/38] Move `org-buffer-list' to org-macs.el--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 19/38] Restore old visibility behaviour of org-refile--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 20/38] Add org-fold-related tests--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 21/38] org-manual: Update to new org-fold function names--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 22/38] ORG-NEWS: Add list of changes--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 23/38] Backport contributed commits--- Ihor Radchenko
2022-04-20 13:26                                                                     ` [PATCH v2 24/38] Fix typo: delete-duplicates → delete-dups Anders Johansson
2022-04-20 13:26                                                                     ` [PATCH v2 25/38] Fix bug in org-get-headingFixes #26, where fontification could make the matching and extraction of heading Anders Johansson
2022-04-20 13:27                                                                     ` [PATCH v2 26/38] Rename remaining org-force-cycle-archived Anders Johansson
2022-04-20 13:27                                                                     ` [PATCH v2 27/38] Fix org-fold--hide-drawers--overlays--- Ihor Radchenko
2022-04-20 13:27                                                                     ` [PATCH v2 28/38] org-string-width: Handle undefined behaviour in older Emacs Ihor Radchenko
2022-04-20 13:27                                                                     ` [PATCH v2 29/38] org-string-width: Work around `window-pixel-width' bug in old Emacs Ihor Radchenko
2022-04-20 13:27                                                                     ` [PATCH v2 30/38] org-fold-show-set-visibility: Fix edge case when folded region is at BOB Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 31/38] org-fold-core: Fix fontification inside folded regions Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 32/38] test-org/string-width: Add tests for strings with prefix properties Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 33/38] org--string-from-props: Fix handling folds in Emacs <28 Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 34/38] org-link-make-string: Throw error when both LINK and DESCRIPTION are empty Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 35/38] test-ol/org-toggle-link-display: Fix compatibility with old Emacs Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 36/38] org-macs.el: Fix fontification checks take 2--- Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 37/38] org-fold-core-fontify-region: Fix cases when fontification is not registered Ihor Radchenko
2022-04-20 13:28                                                                     ` [PATCH v2 38/38] org-agenda.el: Re-enable native compilation* lisp/org-agenda.el: Re-enable native compilation as it does not Ihor Radchenko
2022-04-20 14:47                                                                     ` [PATCH v2 00/38] Final call for comments: Merge org-fold feature branch Bastien
2022-04-20 15:38                                                                       ` Ihor Radchenko
2022-04-20 16:22                                                                         ` Bastien
2022-04-21  6:01                                                                           ` Ihor Radchenko
2022-04-21  6:55                                                                             ` Bastien
2022-04-21  9:27                                                                               ` Ihor Radchenko
2022-04-21  9:43                                                                                 ` Bastien
2022-04-22 18:54                                                                     ` Kévin Le Gouguec
2022-04-25 11:44                                                                       ` Ihor Radchenko
2022-04-25 13:02                                                                         ` Bastien
2022-04-25 13:25                                                                           ` Ihor Radchenko
2022-04-25 14:05                                                                             ` Bastien
2022-04-26 11:48                                                                               ` Ihor Radchenko
2022-04-25 11:45                                                                       ` Ihor Radchenko
2022-04-26  6:10                                                                         ` Kévin Le Gouguec
2022-05-03  4:44                                                                     ` [ISSUE] org-fold does not support auto-reveal for some external package commands Christopher M. Miles
     [not found]                                                                     ` <6270b43a.1c69fb81.835d4.54a6SMTPIN_ADDED_BROKEN@mx.google.com>
2022-05-03  6:33                                                                       ` Ihor Radchenko
2022-05-03 10:19                                                                         ` [DONE] " Christopher M. Miles

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