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>, src-committers <src-committers@freebsd.org>, Enji Cooper <yaneurabeya@gmail.com> Subject: Re: svn commit: r353937 - in head/share: man/man5 mk Message-ID: <20191029071018.GB32637@FreeBSD.org> In-Reply-To: <0938D185-8BF4-45CD-925E-328F03695518@FreeBSD.org> References: <201910231702.x9NH2jQv045130@repo.freebsd.org> <2B855247-5097-442D-8D4A-77D68D2F6186@gmail.com> <20191024124910.GA93913@FreeBSD.org> <67F6BDD3-B633-4C85-AE85-9B075FF0E49E@FreeBSD.org> <20191027165934.GA54960@FreeBSD.org> <0938D185-8BF4-45CD-925E-328F03695518@FreeBSD.org>
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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
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