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# One Big-ass Org File or multiple tiny ones? Finally, the End of the debate!
Leo Vivier
[[!template id=vid src="https://mirror.csclub.uwaterloo.ca/emacsconf/2020/emacsconf-2020--12-one-big-ass-org-file-or-multiple-tiny-ones-finally-the-end-of-the-debate--leo-vivier.webm"]]
[Download .webm video, 720p, 226MB](https://mirror.csclub.uwaterloo.ca/emacsconf/2020/emacsconf-2020--12-one-big-ass-org-file-or-multiple-tiny-ones-finally-the-end-of-the-debate--leo-vivier.webm)
Many discussions have been had over the years on the debate between
using few big files versus many small files. However, more often than
not, those discussions devolve in a collection of anecdotes with
barely any science to them.
Once and for all (or, at least until org-element.el get overhauled), I
would like to settle the debate by explaining why the way we parse
Org-mode files becomes slower as our files grow in size or numbers,
and how that affects their browsing and the building of custom-agenda
views.
I feel qualified to talk about this topic for two reasons:
- I went through the trouble of optimising my agenda-views by
implementing clever regex-based skips, so I know the ceiling that
can be reached with the current tech.
- My work on Org-roam has led me to consider the use of an external
parser for Org-mode files, and whilst we are only at the prototyping
stage, we know what is at stake.
I intend the talk to be fairly light-hearted and humorous, which is the
only way we can do true justice to the topic.
<!-- from the pad --->
- Actual start and end time (EST): Start 2020-11-28T13.43.24; Q&A 2020-11-28T13.51; End: 2020-11-28T14.00.07
# Questions
## What's better: one big file or many small ones? :>
For knowledge management: many files (see also org-roam)
Otherwise: one big file to have everything (todos, projects, notes, etc…) in one single place.
- possible walk around by some hacks?
## Do you switch between British and French accents?
## What's the Emacs icon
Browser extension for org-protocol (anyone got the link / name?) is this <https://addons.mozilla.org/en-US/firefox/addon/org-capture/> or this <https://addons.mozilla.org/en-US/firefox/addon/edit-with-emacs1/>
## How do you feel about archive files in org mode, how can that work in?
## Could you post links?
## How big are your org files?
main file: 38000 lines for all GTD-tasks and he does archive
Karl does use archiving although Karl does use Org tasks even in knowledge management and those don't get archived most of the time.
## Does it not consume more resources and time to load multiple files than a large file of the same contents?
Dealing with hiding contents is computationally expensive.
- I doubt it is correct. Emacs display engine is quite effective dealing with invisible text. Moving cursor around is affected, but I never heard (and never experienced) issues with scrolling on large (2Mb) org files.
- Actually, Org currently uses overlays to hide text, and the overhead of the overlays does eventually add up. There's a working branch that uses text-properties instead, and it may be merged to Org someday.
- It is on the way ;) I need more feedback (see help request in <https://updates.orgmode.org/>)
- If I ever have time to even get my Org upgraded to the latest version, maybe I can think about trying to test that ;)
- Would it help to share the branch on github?
- It would probably make it easier to use and more visible, so…maybe? :)
- Noted (or rather captured) (using org-mode right? :) Indeed
- Karl: whenever I had severe performance issues and somebody was nice and helped to analyze the issue, "overlays" were the root cause in probably 90% of the cases. However, an average user (including me) does not know if a specific feature is implemented using overlays or not. My Org life is basically try and error ;-)
- FYI, if you use org-indent-mode (or whatever the name is of the mode that uses overlays to indent contents), you could disable that to reduce the number of overlays in a buffer. –alphapapa
- Karl: thanks a bunch. However, some features are delivering important features to me so that I do have to accept the performance overhead to a certain level. That's a difficult trade-off I do have to make from time to time ;-)
## Doesn't using many small org file clutter up your buffer list when generating agenda etc?
Personally, I limit org agend to just a few files while keeping notes in many more.
# Notes
- Speaker's emacs.d: <https://github.com/zaeph/.emacs.d>
- Mentioned: <https://karl-voit.at/2020/05/03/current-org-files/> -> Karl's big Org files
- org-element.el: <https://orgmode.org/worg/dev/org-element-api.html>
- single-threaded lisp function that parses the whole file
- "the problem is to let org-element to make sense of the item (?) … "
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