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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 17:56:12 +0200
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 14 Dec 2020 10:23:15 -0500
> Cc: Gregory Heytings <ghe@sdf.org>, Lars Ingebrigtsen <larsi@gnus.org>
> 
> > C=$(grep '^cpu cores' /proc/cpuinfo | cut -d: -f2 | head -1)
> 
> sed -ne '/^cpu cores/{s/.*: *//;p;q}' /proc/cpuinfo

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.