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PG hangs sporadically #524

Closed jgrosso closed 3 years ago

jgrosso commented 4 years ago

Often, PG becomes slow and unresponsive—the goals window doesn't update for ~30 seconds at a time, for example, but manually calling proof-layout-windows causes the UI to update.

I've run a CPU+mem profile during one of the hangs, and nothing looked out-of-the-ordinary.

(Just to confirm it wasn't the proof file itself, I've compared CoqIDE and Proof General with the same file, line number, specific tactic I'm evaluating, etc., and CoqIDE finishes quickly and as expected.)

Unfortunately, it's hard for me to give more specific details since it doesn't happen consistently or with a discernible reason.

cpitclaudel commented 4 years ago

Ouch, thanks for the report.

Unfortunately, it's hard for me to give more specific details

Can you give the output of M-x report-emacs-bug, as well as the list of packages that you're using in Coq buffers, and maybe a screenshot or video of what it looks like when PG is frozen?

jgrosso commented 4 years ago

Please let me know if I can give any other information.

Screen captures of general wonkiness (I occassionally used the Spacemacs keybinding for proof-layout-windows when PG was stuck, i.e. when , l p for goals: , l l refreshes shows up in the minibuffer): https://imgur.com/a/LbPLWVg

emacs-bug-report:

In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin19.6.0, NS appkit-1894.60 Version 10.15.6 (Build 19G2021))
 of 2020-09-30 built on macbook-pro-3.lan
Repository revision: 89f064104c25f8b4362ef54d28fd4bce18f6af3b
Repository branch: feature/native-comp
Windowing system distributor 'Apple', version 10.3.1894
System Description:  Mac OS X 10.15.7

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cpitclaudel commented 4 years ago

Thanks. Do you see the same problem if you turn off company-coq? (I'm guessing yes, because it would cause a real freeze, not just a refresh hang, but…).

jgrosso commented 4 years ago

It might take a while to get a good test because the problem is sporadic, but the next time I start running into issues I'll disable company-coq and see if that helps (and then report back here). (Very preliminary investigation on my part indicates it might, but I don't have nearly enough evidence yet to proceed.)

jgrosso commented 4 years ago

Just for the sake of completeness, one symptom I notice often is that if I call e.g. evil-section-forward-begin (since I'm using Spacemacs with Vim bindings) several times in quick succession, the goals/responses windows will only advance part of the way through the proof script (the background highlighting in the proof file buffer itself, however, is correct).

EDIT: Without knowing anything about PG's internals: it feels like I'm "overwhelming" it somehow by giving it commands too quickly. Not sure if that makes sense or not, but that's the intuitive feel on my end.

jgrosso commented 4 years ago

@cpitclaudel I've finally been able to (briefly) screen-capture the significant difference that disabling company-coq makes, both in terms of the hanging and also overall performance.

https://youtu.be/DI5UkAjs0iQ

cpitclaudel commented 4 years ago

Thanks for your patience, this is terrible. Any chance to M-x profiler-start, do a few back-and-forths, then M-x profiler-report? I wonder if it's garbage collection. (On my machine company-coq freezes Emacs when the completion lists that it loads from Coq get very long.)

djeis97 commented 4 years ago

It's the spinner in company-coq, I discovered the issue myself a week or so ago. Even when it's not actually part of the modeline, when enabled the code for it runs a timer that forces modeline refreshes 20 times a second by default (company-coq-features/spinner-delay). If refreshing your modeline isn't super cheap then my guess is that overwhelms something going on in the background. Regardless, I used to experience this exact slowdown and disabling the spinner fixed it for me.

cpitclaudel commented 4 years ago

Ah, snap, that would make sense. Modelines have become a lot more complex in the last few years, and when I wrote this I had a simple modeline. Should we just turn it off?

dbp commented 3 years ago

I just wanted to flag that I think I've been having the same issue... Essentially, over time Proof General becomes slower and slower (can take 10+ seconds to evaluate a single statement) -- I was just quitting emacs and restarting, which would fix the issue temporarily, but after finding this issue, disabling company-coq seems to have permanently fixed the problem (though, I miss having it!).

cpitclaudel commented 3 years ago

Can you try the fix suggested in the message above?

cpitclaudel commented 3 years ago

(That is, just disabling the spinner feature using M-x customize-variable company-coq-disabled-features?

cpitclaudel commented 3 years ago

(Done in https://github.com/cpitclaudel/company-coq/commit/7423ee253951a439b2491e1cd2ea8bb876d25cb7)

dbp commented 3 years ago

I just set that; I'll let you know if the issue recurs. Thanks!

cpitclaudel commented 3 years ago

Thanks a lot. I've disabled it for everyone in any case.

dbp commented 3 years ago

Just to follow up, I think this was indeed the issue, as it hasn't recurring in the last week or so (and it was a multiple times daily experience before...).

cpitclaudel commented 3 years ago

Thanks a lot for reporting, testing, and confirming. I will close this issue, then.