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Date: Tue, 29 Oct 2019 07:10:18 +0000
From: Alexey Dokuchaev <danfe@freebsd.org>
To: Dimitry Andric <dim@freebsd.org>
Cc: svn-src-head <svn-src-head@freebsd.org>,
 svn-src-all <svn-src-all@freebsd.org>,
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 Enji Cooper <yaneurabeya@gmail.com>
Subject: Re: svn commit: r353937 - in head/share: man/man5 mk
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On Tue, Oct 29, 2019 at 08:04:07AM +0100, Dimitry Andric wrote:
> On 27 Oct 2019, at 17:59, Alexey Dokuchaev <danfe@FreeBSD.org> wrote:
> > 
> > On Sat, Oct 26, 2019 at 04:34:14PM +0200, Dimitry Andric wrote:
> ...
> >> I only tested -j24 on a 32-core system, but I could probably repeat the
> >> experiment with lower and higher -j values: [...]
> >> 
> >> So ~2.3% difference in real time, which is not too bad I think.
> > 
> > Well, I'd say it's acceptable. :-/
> 
> I also tested at low (-j4) and high (-j32) levels.  It turns out that at
> low -j levels, the difference is less pronounced, just ~1.1% in real
> time.  And at high -j levels, it is more pronounced, ~4.3% in real time.
> 
> Note also that at high -j levels, the difference in system time seems
> to get more influence, e.g. at low -j the difference is ~4.5%, while at
> high -j the difference is ~7.2%.  I guess it is because dynamic linking
> uses more syscalls.

Yeah, it would be definitely nice if we could optimize runtime linker.
Thanks for conducting these tests by the way, much appreciated, Dimitry!

./danfe