GNU bug report logs - #64391
30.0.50; buffer narrowing slowdown regression in emacs 29

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Message #8 received at 64391 <at> debbugs.gnu.org (full text, mbox):

From: Andrew Cohen <acohen <at> ust.hk>
To: 64391 <at> debbugs.gnu.org
Subject: bug 64391 wrong git info
Date: Sat, 01 Jul 2023 10:45:35 +0800

Sorry, I didn't give the right git commit info.

The last GOOD commit was

Commit ba9315b1641b483f2bf843c38dcdba0cd1643a55
Emacs 29.0.50
Modify after narrowing:  0.080 s elapsed, 0 GCs, 0.000 s GC, 0.080 s non-GC
Modify before narrowing: 0.073 s elapsed, 0 GCs, 0.000 s GC, 0.073 s non-GC

The first BAD commit showed a slowdown of a significant factor
Commit 9dee6df39cd14be78ff96cb24169842f4772488a
Emacs 29.0.50
Modify after narrowing:  0.734 s elapsed, 9 GCs, 0.051 s GC, 0.684 s non-GC
Modify before narrowing: 0.153 s elapsed, 9 GCs, 0.052 s GC, 0.102 s non-GC

Then a further order of magnitude slowdown shows up around
 Commit 321d4e61551a0f6dfb1abfc0b54e6177735bde58
Modify after narrowing:  7.954 s elapsed, 3 GCs, 0.022 s GC, 7.932 s non-GC
Modify before narrowing: 0.122 s elapsed, 3 GCs, 0.023 s GC, 0.099 s non-GC


Hope this info is helpful.
-- 
Andrew Cohen

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