GNU bug report logs - #49127
Performance degradation in encode_coding_object

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Package: emacs;

Reported by: Victor Nawothnig <victor.nawothnig <at> icloud.com>

Date: Sun, 20 Jun 2021 08:19:03 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 49127 <at> debbugs.gnu.org, victor.nawothnig <at> icloud.com
Subject: bug#49127: Performance degradation in encode_coding_object
Date: Mon, 16 Aug 2021 21:50:03 +0300

> From: Mattias Engdegård <mattiase <at> acm.org>
> Date: Mon, 16 Aug 2021 20:06:32 +0200
> Cc: victor.nawothnig <at> icloud.com, 49127 <at> debbugs.gnu.org
> 
> > Yes.  Why do you think this loop is broken?
> 
> Because unless I misunderstood the code entirely, the current buffer has nothing to do with the operation at hand.

It does, if both src_object and dst_object are the same (current)
buffer.

> It's easy to reproduce the original problem: run Emacs in a terminal and make a buffer with many markers. See how the text displays slower with more markers. I've attached a short example; try (make-test-buffer 1000).

How can we be sure this reproduces the original issue?  The original
issue was reported from a real-life use case, not from a toy program.

> The attached patch fixes this problem.

Thanks, but this is not the whole story with that problem in
encode_coding_object.
This bug report was last modified 3 years and 273 days ago.

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