Date: Fri, 28 Jan 2022 10:56:32 -0800 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: Free BSD <freebsd-arm@freebsd.org> Subject: Re: devel/llvm13 failed to reclaim memory on 8 GB Pi4 running -current [UFS context: used the whole swap space too] Message-ID: <1A92F2FF-29C3-4CBE-B7C3-34C9CD35A75E@yahoo.com> In-Reply-To: <20220128161545.GA56253@www.zefox.net> References: <C8BDF77F-5144-4234-A453-8DEC9EA9E227@yahoo.com> <2C7E741F-4703-4E41-93FE-72E1F16B60E2@yahoo.com> <20220127214801.GA51710@www.zefox.net> <5E861D46-128A-4E09-A3CF-736195163B17@yahoo.com> <20220127233048.GA51951@www.zefox.net> <6528ED25-A3C6-4277-B951-1F58ADA2D803@yahoo.com> <10B4E2F0-6219-4674-875F-A7B01CA6671C@yahoo.com> <54CD0806-3902-4B9C-AA30-5ED003DE4D41@yahoo.com> <A4FA4E8B-635B-454E-87D1-C36A84E2C3BA@yahoo.com> <9771EB33-037E-403E-8A77-7E8E98DCF375@yahoo.com> <20220128161545.GA56253@www.zefox.net>
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On 2022-Jan-28, at 08:15, bob prohaska <fbsd@www.zefox.net> wrote: > On Thu, Jan 27, 2022 at 11:40:46PM -0800, Mark Millard wrote: > [massive edit for readability] > >>>>> What are you using for each of: >>>>> vm.pageout_oom_seq ? >>>>> vm.pfault_oom_attempts ? >>>>> vm.pfault_oom_wait ? > > For the case of devel/llvm13 (Pi4, -current, make) defaults. > Those seem to be: > vm.pageout_oom_seq: 12 > vm.pfault_oom_attempts: 3 > vm.pfault_oom_wait: 10 > With 8 GB RAM I didn't anticipate memory problems 8-( Well, having a swap space suggests otherwise. On these small board computers, for doing what you do, if you think it appropriate to have a swap space, you probably also want at least something like: vm.pageout_oom_seq=120 This was the original setting that made the difference for your builds, back when Mark Johnston first helped use get buildworld buildkernel working on the arm SBCs. This would make it try more before it classifies the context as having the "failed to reclaim memory" condition, including when the swap is not full. Getting what is now correctly labeled as "failed to reclaim memory" before swap was full was the original problem as I remember. > For the case of practical interest (Pi3, stable/13, buildworld): > vm.pageout_oom_seq: 4096 > vm.pfault_oom_attempts: 20 > vm.pfault_oom_wait: 10 > > It appears I should increase the latter two for starters. vm.pfault_oom_attempts and vm.pfault_oom_wait may be related to what the consequences are assocaited for your indefinite wait buffer notices. I'm unsure of specifics for adjusting these as I've been able to fit in my RAM+SWAP configurations and could use vm.pfault_oom_attempts=-1 validly. Plus, I'm not using spinning rust. So I've never explored setting this pair to non-defaults. > Can the Fortran feature be turned off in buildworld? buildworld does not build devel/llvm13 and does not build flang. flang is not part of FreeBSD and so FreeBSD's llvm materials are not configured to build flang. > That's the troublemaker for me. Not for buildworld. But, it is for building devel/llvm13 . I've not dealt with setting up a 2 GiByte swap test context for a RPi3B. I probably will not do so until after I'm done doing these devel/llvm13 tests with flang involved. (I normally have flang turned off in the devel/llvm13 options.) === Mark Millard marklmi at yahoo.com
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