Date: Fri, 28 Jan 2022 19:20:31 -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 [ZFS context: similar to UFS] Message-ID: <6D67BFDF-D786-4BB7-BF2D-CE4D5532D452@yahoo.com> In-Reply-To: <BA25F969-4DAC-4E5D-88EF-9475139B6B8A@yahoo.com> References: <20220127164512.GA51200@www.zefox.net> <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> <B12D2AB9-147E-49EF-854F-A3B999ADDECC@yahoo.com> <BA25F969-4DAC-4E5D-88EF-9475139B6B8A@yahoo.com>
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On 2022-Jan-28, at 15:05, Mark Millard <marklmi@yahoo.com> wrote:
> On 2022-Jan-28, at 00:31, Mark Millard <marklmi@yahoo.com> wrote:
>=20
>>> . . .
>>=20
>> UFS context:
>>=20
>> . . .; load averages: . . . MaxObs: 5.47, 4.99, 4.82
>> . . . threads: . . ., 14 MaxObsRunning
>> . . .
>> Mem: . . ., 6457Mi MaxObsActive, 1263Mi MaxObsWired, 7830Mi =
MaxObs(Act+Wir+Lndry)
>> Swap: 8192Mi Total, 8192Mi Used, K Free, 100% Inuse, 8192Mi =
MaxObsUsed, 14758Mi MaxObs(Act+Lndry+SwapUsed), 16017Mi =
MaxObs(Act+Wir+Lndry+SwapUsed)
>>=20
>>=20
>> Console:
>>=20
>> swap_pager: out of swap space
>> swp_pager_getswapspace(4): failed
>> swp_pager_getswapspace(1): failed
>> swp_pager_getswapspace(1): failed
>> swp_pager_getswapspace(2): failed
>> swp_pager_getswapspace(2): failed
>> swp_pager_getswapspace(4): failed
>> swp_pager_getswapspace(1): failed
>> swp_pager_getswapspace(9): failed
>> swp_pager_getswapspace(4): failed
>> swp_pager_getswapspace(7): failed
>> swp_pager_getswapspace(29): failed
>> swp_pager_getswapspace(9): failed
>> swp_pager_getswapspace(1): failed
>> swp_pager_getswapspace(2): failed
>> swp_pager_getswapspace(1): failed
>> swp_pager_getswapspace(4): failed
>> swp_pager_getswapspace(1): failed
>> swp_pager_getswapspace(10): failed
>>=20
>> . . . Then some time with no messages . . .
>>=20
>> vm_pageout_mightbe_oom: kill context: v_free_count: 7740, =
v_inactive_count: 1
>> Jan 27 23:01:07 CA72_UFS kernel: pid 57238 (c++), jid 3, uid 0, was =
killed: failed to reclaim memory
>> swp_pager_getswapspace(2): failed
>>=20
>>=20
>> Note: The "vm_pageout_mightbe_oom: kill context:"
>> notice is one of the few parts of an old reporting
>> patch Mark J. had supplied (long ago) that still
>> fits in the modern code (or that I was able to keep
>> updated enough to fit, anyway). It is another of the
>> personal updates that I keep in my source trees,
>> such as in /usr/main-src/ .
>>=20
>> diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
>> index 36d5f3275800..f345e2d4a2d4 100644
>> --- a/sys/vm/vm_pageout.c
>> +++ b/sys/vm/vm_pageout.c
>> @@ -1828,6 +1828,8 @@ vm_pageout_mightbe_oom(struct vm_domain *vmd, =
int page_shortage,
>> * start OOM. Initiate the selection and signaling of the
>> * victim.
>> */
>> + printf("vm_pageout_mightbe_oom: kill context: v_free_count: =
%u, v_inactive_count: %u\n",
>> + vmd->vmd_free_count, =
vmd->vmd_pagequeues[PQ_INACTIVE].pq_cnt);
>> vm_pageout_oom(VM_OOM_MEM);
>>=20
>> /*
>>=20
>>=20
>> Again, I'd used vm.pfault_oom_attempts inappropriately
>> for running out of swap (although with UFS it did do
>> a kill fairly soon):
>>=20
>> # Delay when persistent low free RAM leads to
>> # Out Of Memory killing of processes:
>> vm.pageout_oom_seq=3D120
>> #
>> # For plunty of swap/paging space (will not
>> # run out), avoid pageout delays leading to
>> # Out Of Memory killing of processes:
>> vm.pfault_oom_attempts=3D-1
>> #
>> # For possibly insufficient swap/paging space
>> # (might run out), increase the pageout delay
>> # that leads to Out Of Memory killing of
>> # processes (showing defaults at the time):
>> #vm.pfault_oom_attempts=3D 3
>> #vm.pfault_oom_wait=3D 10
>> # (The multiplication is the total but there
>> # are other potential tradoffs in the factors
>> # multiplied, even for nearly the same total.)
>>=20
>> I'll change:
>>=20
>> vm.pfault_oom_attempts
>> vm.pfault_oom_wait
>>=20
>> and reboot --and start the bulk somewhat before
>> going to bed.
>>=20
>>=20
>> For reference:
>>=20
>> [00:02:13] [01] [00:00:00] Building devel/llvm13 | llvm13-13.0.0_3
>> [07:37:05] [01] [07:34:52] Finished devel/llvm13 | llvm13-13.0.0_3: =
Failed: build
>>=20
>>=20
>> [ 65% 4728/7265] . . . flang/lib/Evaluate/fold-designator.cpp
>> [ 65% 4729/7265] . . . flang/lib/Evaluate/fold-integer.cpp
>> FAILED: =
tools/flang/lib/Evaluate/CMakeFiles/obj.FortranEvaluate.dir/fold-integer.c=
pp.o=20
>> [ 65% 4729/7265] . . . flang/lib/Evaluate/fold-logical.cpp
>> [ 65% 4729/7265] . . . flang/lib/Evaluate/fold-complex.cpp
>> [ 65% 4729/7265] . . . flang/lib/Evaluate/fold-real.cpp
>>=20
>> So the flang/lib/Evaluate/fold-integer.cpp one was the one killed.
>>=20
>> Notably, the specific sources being compiled are different
>> than in the ZFS context report. But this might be because
>> of my killing ninja explicitly in the ZFS context, before
>> killing the running compilers.
>>=20
>> Again, using the options to avoid building the Fortran
>> compiler probably avoids such memory use --if you do not
>> need the Fortran compiler.
>=20
>=20
> UFS based on instead using (not vm.pfault_oom_attempts=3D-1):
>=20
> vm.pfault_oom_attempts=3D 3
> vm.pfault_oom_wait=3D 10
>=20
> It reached swap-space-full:
>=20
> . . .; load averages: . . . MaxObs: 5.42, 4.98, 4.80
> . . . threads: . . ., 11 MaxObsRunning
> . . .
> Mem: . . ., 6482Mi MaxObsActive, 1275Mi MaxObsWired, 7832Mi =
MaxObs(Act+Wir+Lndry)
> Swap: 8192Mi Total, 8192Mi Used, K Free, 100% Inuse, 4096B In, 81920B =
Out, 8192Mi MaxObsUsed, 14733Mi MaxObs(Act+Lndry+SwapUsed), 16007Mi =
MaxObs(Act+Wir+Lndry+SwapUsed)
>=20
>=20
> swap_pager: out of swap space
> swp_pager_getswapspace(5): failed
> swp_pager_getswapspace(25): failed
> swp_pager_getswapspace(1): failed
> swp_pager_getswapspace(31): failed
> swp_pager_getswapspace(6): failed
> swp_pager_getswapspace(1): failed
> swp_pager_getswapspace(25): failed
> swp_pager_getswapspace(10): failed
> swp_pager_getswapspace(17): failed
> swp_pager_getswapspace(27): failed
> swp_pager_getswapspace(5): failed
> swp_pager_getswapspace(11): failed
> swp_pager_getswapspace(9): failed
> swp_pager_getswapspace(29): failed
> swp_pager_getswapspace(2): failed
> swp_pager_getswapspace(1): failed
> swp_pager_getswapspace(9): failed
> swp_pager_getswapspace(20): failed
> swp_pager_getswapspace(4): failed
> swp_pager_getswapspace(21): failed
> swp_pager_getswapspace(11): failed
> swp_pager_getswapspace(2): failed
> swp_pager_getswapspace(21): failed
> swp_pager_getswapspace(2): failed
> swp_pager_getswapspace(1): failed
> swp_pager_getswapspace(2): failed
> swp_pager_getswapspace(3): failed
> swp_pager_getswapspace(3): failed
> swp_pager_getswapspace(2): failed
> swp_pager_getswapspace(1): failed
> swp_pager_getswapspace(20): failed
> swp_pager_getswapspace(2): failed
> swp_pager_getswapspace(1): failed
> swp_pager_getswapspace(16): failed
> swp_pager_getswapspace(6): failed
> swap_pager: out of swap space
> swp_pager_getswapspace(4): failed
> swp_pager_getswapspace(9): failed
> swp_pager_getswapspace(17): failed
> swp_pager_getswapspace(30): failed
> swp_pager_getswapspace(1): failed
>=20
> . . . Then some time with no messages . . .
>=20
> vm_pageout_mightbe_oom: kill context: v_free_count: 7875, =
v_inactive_count: 1
> Jan 28 14:36:44 CA72_UFS kernel: pid 55178 (c++), jid 3, uid 0, was =
killed: failed to reclaim memory
> swp_pager_getswapspace(11): failed
>=20
>=20
> So, not all that much different from how the
> vm.pfault_oom_attempts=3D-1 example looked.
>=20
>=20
> [00:01:00] [01] [00:00:00] Building devel/llvm13 | llvm13-13.0.0_3
> [07:41:39] [01] [07:40:39] Finished devel/llvm13 | llvm13-13.0.0_3: =
Failed: build
>=20
> Again it killed:
>=20
> FAILED: =
tools/flang/lib/Evaluate/CMakeFiles/obj.FortranEvaluate.dir/fold-integer.c=
pp.o
>=20
> So, basically the same stopping area as for the
> vm.pfault_oom_attempts=3D-1 example.
>=20
>=20
> I'll set things up for swap totaling to 30 GiBytes, reboot,
> and start it again. This will hopefully let me see and
> report MaxObs??? figures for a successful build when there
> is RAM+SWAP: 38 GiBytes. So: more than 9 GiBytes per compiler
> instance (mean).
The analogous ZFS test with:
vm.pfault_oom_attempts=3D 3
vm.pfault_oom_wait=3D 10
got:
. . .; load averages: . . . MaxObs: 5.90, 5.07, 4.80
. . . threads: . . ., 11 MaxObsRunning
. . .
Mem: . . ., 6006Mi MaxObsActive
. . .
Swap: 8192Mi Total, 8192Mi Used, 32768B Free, 99% Inuse, 28984Ki In, =
4792Ki Out, 8192Mi MaxObsUsed, 14282Mi MaxObs(Act+Lndry+SwapUsed), =
16009Mi MaxObs(Act+Wir+Lndry+SwapUsed)
(I got that slightly early, before the 100% showed up.)
swap_pager: out of swap space
swp_pager_getswapspace(10): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(4): failed
swp_pager_getswapspace(16): failed
swp_pager_getswapspace(5): failed
swp_pager_getswapspace(2): failed
swp_pager_getswapspace(8): failed
swp_pager_getswapspace(12): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(32): failed
swp_pager_getswapspace(4): failed
swp_pager_getswapspace(9): failed
swp_pager_getswapspace(4): failed
swp_pager_getswapspace(17): failed
swp_pager_getswapspace(21): failed
swp_pager_getswapspace(10): failed
swp_pager_getswapspace(18): failed
swp_pager_getswapspace(6): failed
swp_pager_getswapspace(2): failed
swp_pager_getswapspace(14): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(5): failed
swp_pager_getswapspace(25): failed
swp_pager_getswapspace(12): failed
swp_pager_getswapspace(5): failed
swp_pager_getswapspace(7): failed
swp_pager_getswapspace(10): failed
swp_pager_getswapspace(3): failed
swp_pager_getswapspace(24): failed
swap_pager: out of swap space
swp_pager_getswapspace(11): failed
swap_pager: out of swap space
swp_pager_getswapspace(17): failed
swp_pager_getswapspace(5): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(32): failed
swp_pager_getswapspace(15): failed
swp_pager_getswapspace(19): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(25): failed
swp_pager_getswapspace(11): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(15): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(8): failed
swp_pager_getswapspace(31): failed
swp_pager_getswapspace(26): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(20): failed
swp_pager_getswapspace(4): failed
swp_pager_getswapspace(3): failed
swp_pager_getswapspace(3): failed
swp_pager_getswapspace(9): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(15): failed
swp_pager_getswapspace(3): failed
swp_pager_getswapspace(7): failed
swp_pager_getswapspace(8): failed
swp_pager_getswapspace(17): failed
swp_pager_getswapspace(2): failed
swp_pager_getswapspace(10): failed
swp_pager_getswapspace(6): failed
swp_pager_getswapspace(2): failed
swp_pager_getswapspace(11): failed
swp_pager_getswapspace(21): failed
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(9): failed
swp_pager_getswapspace(32): failed
swp_pager_getswapspace(2): failed
swp_pager_getswapspace(32): failed
swp_pager_getswapspace(25): failed
swp_pager_getswapspace(21): failed
swp_pager_getswapspace(22): failed
swp_pager_getswapspace(14): failed
swp_pager_getswapspace(10): failed
swap_pager: out of swap space
swp_pager_getswapspace(1): failed
swp_pager_getswapspace(28): failed
swp_pager_getswapspace(2): failed
swp_pager_getswapspace(13): failed
swp_pager_getswapspace(3): failed
swp_pager_getswapspace(31): failed
swp_pager_getswapspace(20): failed
swp_pager_getswapspace(2): failed
vm_pageout_mightbe_oom: kill context: v_free_count: 8186, =
v_inactive_count: 1
Jan 28 18:42:42 CA72_4c8G_ZFS kernel: pid 98734 (c++), jid 3, uid 0, was =
killed: failed to reclaim memory
[00:00:49] [01] [00:00:00] Building devel/llvm13 | llvm13-13.0.0_3
[08:06:09] [01] [08:05:20] Finished devel/llvm13 | llvm13-13.0.0_3: =
Failed: build
FAILED: =
tools/flang/lib/Evaluate/CMakeFiles/obj.FortranEvaluate.dir/fold-complex.c=
pp.o
and flang/lib/Evaluate/fold-integer.cpp was one of the compiles going =
on.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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