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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Does Emacs return memory to the system on Mac OS X or *BSD?
Date: Thu, 11 May 2017 05:36:58 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: George Plymale II <georgie@southernohio.net>,  Eli Zaretskii <eliz@gnu.org>,  Emacs developers <emacs-devel@gnu.org>
> Date: Wed, 10 May 2017 20:06:05 -0400
> 
> IOW the only difference is in the fact that it requires more swap space,
> which can occasionally be noticeable, e.g. when you don't have swap
> space at all.

No, it also means that part of the VM address space is in use and
cannot be used by other apps.