GNU bug report logs - #62975
29.0.90; Forking processes on macOS has become very slow in Emacs 29

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Package: emacs;

Reported by: "John Wiegley" <johnw <at> gnu.org>

Date: Thu, 20 Apr 2023 18:42:01 UTC

Severity: normal

Found in version 29.0.90

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From: Alan Third <alan <at> idiocy.org>
To: 62975 <at> debbugs.gnu.org
Subject: bug#62975: 29.0.90; Forking processes on macOS has become very slow in Emacs 29
Date: Sun, 16 Jul 2023 13:54:12 +0100

Check you have

    #define HAVE_POSIX_SPAWN 1

defined in config.h.

There's a much larger set of requirements to use posix_spawn at the top
of callproc.c, but I don't understand them.

If, for some reason, your system isn't using posix_spawn then it will be
using fork (Apple removed vfork) and yes, it will be as slow as Emacs 26.
-- 
Alan Third
This bug report was last modified 2 years and 66 days ago.

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