very high cpu usage suddenly from jinx--mod-check

[emacsomancer]

I'm not sure what's happened, as I've used jinx for quite a while without issue, and the last update seemed to have been a week ago, so I'm guessing it's an interaction with something, but I'm suddenly seeing Emacs-freezing (for 5-10 seconds) CPU issues related to Jinx:

     61943  90% - timer-event-handler
       61941  90%  - apply
       61599  90%   - jinx--timer-handler
       61598  90%    - jinx--check-pending
       61582  90%     - jinx--check-region
       61562  90%      - jinx--word-valid-p
       61552  90%         jinx--mod-check
           2   0%        jinx--regexp-ignored-p
          16   0%       jinx--find-visible-pending  

I found #35 which seems very similar, but I see from that issue that the predicate in question was removed already.

It's happening in org-mode, and seems perhaps linked to opening up :PROPERTIES: trays.

[minad]

Hi!

Can you please give more details? Which versions of Emacs, Org, Jinx and Enchant do you use exactly? Issue #35 is not related - it was due to the slow flyspell predicate, which we've stopped using here since. The odd thing in your report is that jinx--mod-check itself is expensive. jinx--mod-check is the native call to Enchant and is usually fast.

[emacsomancer]

Emacs-master (as of Sun 02 Jun 2024 12:20:44 AM CDT), Org 9.7.2, jinx-20240606.909, Enchant 2.8.0-1.

It really seems to be a problem with :PROPERTIES: trays. It'll take 5-10 seconds to open, and then still be very slow for another 5-10 seconds.

If I revert to my old flyspell config and turn off jinx, the issue disappears (which is probably unsurprising, given that it seems to be about calls to Enchant).

Here's what the one property tray looks like:

:PROPERTIES:
:ID:       a74d5938-5747-4e2a-871a-8d6019395617
:AUTHOR:   "emacsomancer"
:MAIL:     me@me.com
:ROAM_ALIASES: EMACS emacs "GNU Emacs"
:CREATION_TIME: 1630461465
:LAT-LONG: 0,0
:LOCATION: "nowhere"
:LOCATION_SRC: hardcoded-ethernet
:END:
#+title: Emacs
#+date: [2021-12-15 Wed 16:34]
#+source: [https://en.wikipedia.org/wiki/Emacs https://git.savannah.gnu.org/cgit/emacs.git/log/ https://en.wikipedia.org/wiki/GNU_Emacs]

[emacsomancer]

I think I might have figured it out - possibly a conflict with org-appear.

Edit: No, that doesn't seem to solve it, upon further testing.

[emacsomancer]

I think it's something about Enchant 2.8.0. I have the same Emacs set up on several machines, and on the two Arch machines, with 2.8.0, I have the same problem, but not on a different machine (same Emacs config) with 2.6.2.

[minad]

Thanks. Does the problem also occur with Enchant 2.7? Can you please report this upstream on the Enchant repository? If there is a significant slow down in Enchant itself it can only be fixed there.

[emacsomancer]

I'll report upstream. [edit: filed at https://github.com/AbiWord/enchant/issues/386 ]

I checked Arch history: they updated to 2.7 in May and there was no issue until they updated to 2.8 a week ago.