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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Two strange messages while building Emacs on MS-Windows
Date: Mon, 10 Dec 2012 16:44:24 +0200
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> Date: Mon, 10 Dec 2012 11:59:14 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: dmoncayo@gmail.com, emacs-devel@gnu.org
> 
> The command "cd lisp && make compile-always", which sequentially
> compiles every Lisp file, was timed on this machine as follows:
> 
>   real    23m11.277s
>   user    16m50.820s
>   sys     2m45.910s
> 
> The same command with "make -j2" times like this:
> 
>   real    11m51.381s
>   user    17m15.850s
>   sys     2m49.410s
> 
> which is an entirely reasonable 2-fold speedup in the elapsed time
> (and seems to reveal some bug in accounting for user- and
> system-times).

Actually, there's no bug: user and system times are sums of all the
cores that participated in the job, so for -j2 these numbers are
roughly doubled.