Date: Mon, 27 Jan 2020 12:48:44 -0800 From: Cy Schubert <Cy.Schubert@cschubert.com> To: Mark Millard <marklmi@yahoo.com> Cc: Cy Schubert <Cy.Schubert@cschubert.com>, "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>, sgk@troutmask.apl.washington.edu, freebsd-current@freebsd.org, yasu@utahime.org Subject: Re: After update to r357104 build of poudriere jail fails with 'out of swap space' Message-ID: <202001272048.00RKmiZs006726@slippy.cwsent.com> In-Reply-To: <BA0CE7D8-CFA1-40A3-BEFA-21D0C230B082@yahoo.com> References: <202001261745.00QHjkuW044006@gndrsh.dnsmgr.net> <202001271309.00RD96nr005876@slippy.cwsent.com> <A0E565B0-52A1-41CE-915F-35B8E0F9394F@cschubert.com> <BA0CE7D8-CFA1-40A3-BEFA-21D0C230B082@yahoo.com>
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In message <BA0CE7D8-CFA1-40A3-BEFA-21D0C230B082@yahoo.com>, Mark Millard write s: > > > > On 2020-Jan-27, at 10:20, Cy Schubert <Cy.Schubert at cschubert.com> wrote: > > > On January 27, 2020 5:09:06 AM PST, Cy Schubert <Cy.Schubert@cschubert.com> > wrote: > >>> . . . > >> > >> Setting a lower arc_max at boot is unlikely to help. Rust was building > >> on > >> the 8 GB and 5 GB 4 core machines last night. It completed successfully > >> on > >> the 8 GB machine, while using 12 MB of swap. ARC was at 1307 MB. > >> > >> On the 5 GB 4 core machine the rust build died of OOM. 328 KB swap was > >> used. ARC was reported at 941 MB. arc_min on this machine is 489.2 MB. > > > > MAKE_JOBS_NUMBER=3 worked building rust on the 5 GB 4 core machine. ARC is > at 534 MB with 12 MB swap used. > > If you increase vm.pageout_oom_seq to, say, 10 times what you now use, > does MAKE_JOBS_NUMBER=4 complete --or at least go notably longer before > getting OOM behavior from the system? (The default is 12 last I checked. > So that might be what you are now using.) It's already 4096 (default is 12). > > Have you tried also having: vm.pfault_oom_attempts="-1" (Presuming > you are not worried about actually running out of swap/page space, > or can tolerate a deadlock if it does run out.) This setting presumes > head, not release or stable. (Last I checked anyway.) Already there. The box is a sandbox with remote serial console access so deadlocks are ok. > > It would be interesting to know what difference those two settings > together might make for your context: it seems to be a good context > for testing in this area. (But you might already have set them. > If so, it would be good to report the figures in use.) > > Of course, my experiment ideas need not be your actions. It's a sandbox machine. We already know 8 GB works with 4 threads on as many cores. And, 5 GB works with 3 threads on 4 cores. -- Cheers, Cy Schubert <Cy.Schubert@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org The need of the many outweighs the greed of the few.help
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