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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Script for compiling more quietly
Date: Mon, 14 Dec 2020 18:49:32 +0200
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Cc: larsi@gnus.org, monnier@iro.umontreal.ca, emacs-devel@gnu.org
To: Gregory Heytings <ghe@sdf.org>
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> Date: Mon, 14 Dec 2020 16:07:04 +0000
> Cc: larsi@gnus.org, Stefan Monnier <monnier@iro.umontreal.ca>,
>  emacs-devel@gnu.org
> From: Gregory Heytings via "Emacs development discussions." <emacs-devel@gnu.org>
> 
> > FWIW, I think you should leave the N part of "make -jN" to the end user. 
> > No one said they have nothing else to do at the same time as they build 
> > Emacs; they could be building some other large program at the same time, 
> > or need the CPU for something else.
> 
> It is, the number of cores is just a default value, that can be overridden 
> by "emake -j1" for instance.

In which case I don't understand why it is important to be accurate
with the actual number of cores.  You could just use 4 as the default.