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From: Ralf Fassel <ralfixx@gmx.de>
Newsgroups: comp.lang.tcl
Subject: Re: How to speed up a script by threading?
Date: Fri, 19 Jul 2024 11:08:14 +0200
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* Mark Summerfield <mark@qtrac.eu>
| The program below (~95 LOC) is very slow.
| One way to speed it up would be to process each directory given on the 
| command line in its own thread.
| But I can't see how to do this.
| Or is there a better way to make it faster?
| I'm using Tcl/Tk 9.0b2 on Linux.

Since you give the directories on the (linux) commandline, put the
one-thread-per-dir one level up:

Instead of
  your-prog dir1 dir2 dir3 ...
do
  for dir in dir1 dir2 dir3 ... ; do
    your-prog $dir &
  done

That way multiple processes (not threads) run in parallel,
and you don't have to change the program at all.

My 0.02.
R'