GNU bug report logs - #77942
31.0.50; replace-region-contents gets stuck

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Message #38 received at 77942 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: monnier <at> iro.umontreal.ca, 77942 <at> debbugs.gnu.org
Subject: Re: bug#77942: 31.0.50; replace-region-contents gets stuck
Date: Tue, 22 Apr 2025 14:34:30 +0300

> Cc: 77942 <at> debbugs.gnu.org
> From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
> Date: Mon, 21 Apr 2025 22:39:39 +0200
> 
> Just found that replace-region-contents apparently uses a diff
> algorithm from diffseq.h, and that says
> 
>    The basic algorithm is described in:
>    "An O(ND) Difference Algorithm and its Variations", Eugene W. Myers,
>    Algorithmica Vol. 1, 1986, pp. 251-266,
> 
> If N is the buffer size and D is the diff size, and both are large, good
> luck with that. And indeed, reducing the buffer size by 2 orders of
> magnitude makes things acceptable for my use case.

You should be able to cut your losses by passing a sufficiently small
number for MAX-SEC, perhaps even zero.

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