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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Experiment with threads - no concurrency?
Date: Mon, 06 Sep 2021 18:47:46 +0300
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Mon, 06 Sep 2021 16:35:04 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Date: Mon, 06 Sep 2021 16:35:04 +0200
> 
> I did a little experiment today. I wanted to count frequency of Emacs functions
> usage. So I started by indexing all functions and macros.
> 
> Since it is kind of lot's of I/O and independent tasks to do, I thought threads
> could come handy. However I see no difference from sequential code.

You shouldn't.  Emacs doesn't switch threads on just any I/O, it
switches threads when it waits for input from subprocesses, network,
and keyboard.