Date: Mon, 28 Oct 2024 13:31:06 -0700 From: Cy Schubert <Cy.Schubert@cschubert.com> To: David Wolfskill <david@catwhisker.org>, Maku Bex <zagazaw2004@gmail.com>, freebsd-current@freebsd.org Subject: Re: speedup build time Message-ID: <20241028203106.60D90431@slippy.cwsent.com> In-Reply-To: <Zx7fqFzbjuCvZgaw@albert.catwhisker.org> References: <012d01db28cc$5fc66ac0$1f534040$@gmail.com> <Zx7fqFzbjuCvZgaw@albert.catwhisker.org>
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In message <Zx7fqFzbjuCvZgaw@albert.catwhisker.org>, David Wolfskill writes: > > --ySbbNwu/7EFCexY0 > Content-Type: text/plain; charset=us-ascii > Content-Disposition: inline > Content-Transfer-Encoding: quoted-printable > > On Sun, Oct 27, 2024 at 07:00:17PM -0500, Maku Bex wrote: > > ... > > I'm trying to figure out a way to decrease build time of -CURRENT and/or > > -STABLE but it is not working out that well.=20 > > I've tried the following: > > * Tuning /etc/make.conf and /etc/src-env.conf based on their manpages > > (make.conf(5), make(1), src.conf(5)). > > * Removed certain options from GENERIC, which reduced the kernel build > > time significantly.=20 > >=20 > > Hardware specs: > > * I7-10700T 8C/16T @2.0GHz. > > * 16GB RAM. > > * 256GB NVMe. > >=20 > > Currently, 'make buildworld' has been running for 7hrs and counting. Is > > there anything else I can do to speed up world build? > > .... > > First, some questions -- whether or not you wish to share the answers, I > believe that answering the questions (if only for yourself) may be > helpful: > > * What (if any) "max_jobs" (make's "-j" parameter) are you using? For a > 16T system, I expect I would start with a value of around 28. > > * Are you using make's "meta" mode? I do. > > * Can you get more memory for that system? I haven't found meta mode faster than without. Yes it reduces build time in some cases but many other it rebuilds sources I would never have thought it should rebuild. Especially llvm. I find meta mode rebuilds clang more often than before I used meta mode. The reason for switching back to meta mode was a kernel patch which caused some weird behaviour. After some back & forth with kib@, I had determined that there were some old objects not being rebuilt when they should have been. I suppose one could say that meta mode is doing the correct thing by rebuilding objects when I feel it shouldn't, because the strange behaviour I had encountered a couple of months ago would never have happened had I been using meta mode. Though I can't prove it, my sense is that it does "gratuitously" rebuild llvm more often than without. I can't prove this scientifically. Just a seat of the pants "assessment." -- Cheers, Cy Schubert <Cy.Schubert@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: https://FreeBSD.org NTP: <cy@nwtime.org> Web: https://nwtime.org e^(i*pi)+1=0
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