On 2022-Aug-14, at 18:40, Mark Millard <[email protected]> wrote:
> On 2022-Aug-14, at 09:35, Mark Millard <[email protected]> wrote:
>
>> On 2022-Aug-14, at 07:50, Nuno Teixeira <[email protected]> wrote:
>>
>> . . .
>>> have some time now and it's caused by a build peak of memory that affects
>>> people with less than 32/64GB mem and to solve building it must be build
>>> using one builder with one core thats takes about 7 hours on my machine or
>>> with 6c+6t on 12.3 i386 that takes about 45min (123i386 is the only jail
>>> that I can use all cores).
>>
>> Last I tried I built all the various devel/llvm* on a 8 GiByte
>> RPi4B, 4 builders active and ALLOW_MAKE_JOBS=yes in use.
>> 4 FreeBSD cpus. So the load average would have been around 16+
>> much of the time during devel/llvm13 's builder activity.
>> USE_TMPFS=data in use.
>>
>> Similarly for a 16 GiByte machine --but it is also an aarch64
>> context, also 4 FreebSD cpus.
>>
>> But I use in /boot/loader.conf:
>>
>> #
>> # Delay when persistent low free RAM leads to
>> # Out Of Memory killing of processes:
>> vm.pageout_oom_seq=120
>>
>> This has been historically important to avoiding the likes of
>> "was killed: failed to reclaim memory" and related notices on
>> various armv7 and aarch64 small board computers used to
>> buildworld buildkernel and build ports, using all the cores.
>>
>> The only amd64 system that I've access to has 32 FreeBSD cpus
>> and 128 GiBytes of RAM. Not a good basis for a comparison test
>> with your context. I've no i386 access at all.
>>
>>> llvm 12 build without problems
>>
>> Hmm. I'll try building devel/llvm13 on aarch64 with periodic
>> sampling of the memory use to see maximum observed figures
>> for SWAP and for various categories of RAM, as well as the
>> largest observed load averages.
>>
>> ZFS context use. I could try UFS as well.
>>
>> Swap: 30720Mi Total on the 8GiByte RPi4B.
>> So about 38 GiBytes RAM+SWAP available.
>> We should see how much SWAP is used.
>>
>> Before starting poudriere, shortly after a reboot:
>>
>> 19296Ki MaxObs(Act+Lndry+SwapUsed)
>> (No SWAP in use at the time.)
>>
>> # poudriere bulk -jmain-CA72-bulk_a -w devel/llvm13
>>
>> for the from scratch build: reports:
>>
>> [00:00:34] Building 91 packages using up to 4 builders
>>
>> The ports tree is about a month back:
>>
>> # ~/fbsd-based-on-what-commit.sh -C /usr/ports/
>> branch: main
>> merge-base: 872199326a916efbb4bf13c97bc1af910ba1482e
>> merge-base: CommitDate: 2022-07-14 01:26:04 +0000
>> 872199326a91 (HEAD -> main, freebsd/main, freebsd/HEAD) devel/ruby-build:
>> Update to 20220713
>> n589512 (--first-parent --count for merge-base)
>>
>> But, if I gather right, the problem you see goes back
>> before that.
>>
>> I can not tell how 4 FreeBSD cpus compares to the
>> count that the Lenovo Legion 5 gets.
>>
>> I'll report on its maximum observed figures once the
>> build stops. It will be a while before the RPi4B
>> gets that far.
>>
>> The ports built prior to devel/llvm13's builder starting
>> will lead to load averages over 4 from up to 4
>> builders, each potentially using up to around 4
>> processes. I'll see about starting a separate tracking
>> once devel/llvm13 's builder has started if I happen
>> to observe it at the right time frame for doing such.
>>
>> . . .
>
> I actually have tried a few builds on different
> machines. The 8GiByte RPi4B takes a long time and
> is currently omitted from this report.
>
>
> 128 GiByte amd64 ThreadRipper 1950X (16 cores, so 32 FreeBSD cpus):
> but using MAKE_JOBS_NUMBER=4 (with both FLANG and MLIR)
>
> On amd64 I started a build with FLANG and MLIR enabled,
> using MAKE_JOBS_NUMBER=4 in devel/llvm13/Makefile to
> limit the build to 4 FreeBSD cpus. It is a ZFS context.
> Given the 128 GiBytes of RAM, there will not be much
> for effects of memory-pressure. But will record the
> MaxObs(Act+Lndry+SwapUsed) and the like.
>
> ---Begin OPTIONS List---
> ===> The following configuration options are available for llvm13-13.0.1_3:
> BE_AMDGPU=on: AMD GPU backend (required by mesa)
> BE_WASM=on: WebAssembly backend (required by firefox via wasi)
> CLANG=on: Build clang
> COMPILER_RT=on: Sanitizer libraries
> DOCS=on: Build and/or install documentation
> EXTRAS=on: Extra clang tools
> FLANG=on: Flang FORTRAN compiler
> GOLD=on: Build the LLVM Gold plugin for LTO
> LIT=on: Install lit and FileCheck test tools
> LLD=on: Install lld, the LLVM linker
> LLDB=on: Install lldb, the LLVM debugger
> MLIR=on: Multi-Level Intermediate Representation
> OPENMP=on: Install libomp, the LLVM OpenMP runtime library
> PYCLANG=on: Install python bindings to libclang
> ====> Options available for the single BACKENDS: you have to select exactly
> one of them
> BE_FREEBSD=off: Backends for FreeBSD architectures
> BE_NATIVE=off: Backend(s) for this architecture (X86)
> BE_STANDARD=on: All non-experimental backends
> ===> Use 'make config' to modify these settings
> ---End OPTIONS List---
>
> [02:23:55] [01] [02:04:29] Finished devel/llvm13 | llvm13-13.0.1_3: Success
>
> For just the devel/llvm13 builder activity, no parallel
> builds and excluding the prerequisites being built:
>
> load averages: . . . MaxObs: 6.76, 4.75, 4.38
>
> 6812Mi MaxObs(Act+Lndry+SwapUsed) but no use of SWAP observed.
>
> Note: MAKE_JOBS_NUMBER does not constrain any lld
> procoess from using all available FreeBSD cpus
> (via threading) --and multiple lld's can be
> active at the same time.
>
> So this looks to fit in a 16 GiByte RAM context just fine,
> no SWAP needed.
>
> I'll try MAKE_JOBS_NUMBER=12 instead and rerun on the same
> machine.
>
>
>
> 128 GiByte amd64 ThreadRipper 1950X (16 cores, so 32 FreeBSD cpus):
> but using MAKE_JOBS_NUMBER=12 (with both FLANG and MLIR)
>
> ---Begin OPTIONS List---
> ===> The following configuration options are available for llvm13-13.0.1_3:
> BE_AMDGPU=on: AMD GPU backend (required by mesa)
> BE_WASM=on: WebAssembly backend (required by firefox via wasi)
> CLANG=on: Build clang
> COMPILER_RT=on: Sanitizer libraries
> DOCS=on: Build and/or install documentation
> EXTRAS=on: Extra clang tools
> FLANG=on: Flang FORTRAN compiler
> GOLD=on: Build the LLVM Gold plugin for LTO
> LIT=on: Install lit and FileCheck test tools
> LLD=on: Install lld, the LLVM linker
> LLDB=on: Install lldb, the LLVM debugger
> MLIR=on: Multi-Level Intermediate Representation
> OPENMP=on: Install libomp, the LLVM OpenMP runtime library
> PYCLANG=on: Install python bindings to libclang
> ====> Options available for the single BACKENDS: you have to select exactly
> one of them
> BE_FREEBSD=off: Backends for FreeBSD architectures
> BE_NATIVE=off: Backend(s) for this architecture (X86)
> BE_STANDARD=on: All non-experimental backends
> ===> Use 'make config' to modify these settings
> ---End OPTIONS List---
>
> [00:55:37] [01] [00:55:30] Finished devel/llvm13 | llvm13-13.0.1_3: Success
>
> load averages: . . . MaxObs: 12.45, 12.20, 11.52
>
> 13074Mi MaxObs(Act+Lndry+SwapUsed) but no use of SWAP observed.
>
> Note: MAKE_JOBS_NUMBER does not constrain any lld
> procoess from using all available FreeBSD cpus
> (via threading) --and multiple lld's can be
> active at the same time.
>
> (16+4)*1024 Mi - 13074 Mi == 7406 Mi for other RAM+SWAP use.
> (Crude estimates relative to your context.) That would seem
> to be plenty.
>
>
> Conclusion:
>
> It is far from clear what all was contributing to your
> (16+4)*1024 MiBytes proving to be insufficient.
> Unintentional tmpfs use, such as a typo in USE_TMPFS
> in /usr/local/etc/poudriere.conf ? I really have no
> clue: the example is arbitrary.
>
>
>
> Other notes:
>
> # uname -apKU
> FreeBSD amd64_ZFS 14.0-CURRENT FreeBSD 14.0-CURRENT #50
> main-n256584-5bc926af9fd1-dirty: Wed Jul 6 17:44:43 PDT 2022
> root@amd64_ZFS:/usr/obj/BUILDs/main-amd64-nodbg-clang/usr/main-src/amd64.amd64/sys/GENERIC-NODBG
> amd64 amd64 1400063 1400063
>
> Note that the above is without WITNESS and without INVARIANTS and the like.
>
> The only thing commited to main's contrib/llvm-project after that
> was 9ef1127008 :
>
> QUOTE
> Apply tentative llvm fix for avoiding fma on PowerPC SPE
> Merge llvm review D77558, by Justin Hibbits:
>
> PowerPC: Don't hoist float multiply + add to fused operation on SPE
>
> SPE doesn't have a fmadd instruction, so don't bother hoisting a
> multiply and add sequence to this, as it'd become just a library call.
> Hoisting happens too late for the CTR usability test to veto using the CTR
> in a loop, and results in an assert "Invalid PPC CTR loop!".
> END QUOTE
Here I add the 8 GiByte RPi4B results, in this case
both with FLANG/MLIR results and without results. The
context has and uses 4 FreeBSD cpus. No other builder
is active when devel/llvm13's builder is.
With both FLANG and MLIR:
---Begin OPTIONS List---
===> The following configuration options are available for llvm13-13.0.1_3:
BE_AMDGPU=on: AMD GPU backend (required by mesa)
BE_WASM=on: WebAssembly backend (required by firefox via wasi)
CLANG=on: Build clang
DOCS=on: Build and/or install documentation
EXTRAS=on: Extra clang tools
FLANG=on: Flang FORTRAN compiler
LIT=on: Install lit and FileCheck test tools
LLD=on: Install lld, the LLVM linker
LLDB=on: Install lldb, the LLVM debugger
MLIR=on: Multi-Level Intermediate Representation
OPENMP=on: Install libomp, the LLVM OpenMP runtime library
PYCLANG=on: Install python bindings to libclang
====> Options available for the single BACKENDS: you have to select exactly one
of them
BE_FREEBSD=off: Backends for FreeBSD architectures
BE_NATIVE=off: Backend(s) for this architecture (AArch64)
BE_STANDARD=on: All non-experimental backends
===> Use 'make config' to modify these settings
---End OPTIONS List---
[13:49:55] [01] [13:49:17] Finished devel/llvm13 | llvm13-13.0.1_3: Success
load averages: . . . MaxObs: 6.43, 5.91, 5.77
(Note: spanned overnight so the nightly cron job was
spanned.)
Note: Given that SWAP was used, I report more
Max(imum)Obs(erved) figures for this case than
I've been reporting for other tests:
5696Mi MaxObsActive
1775Mi MaxObsSwapUsed
7374Mi MaxObs(Act+Lndry+SwapUsed)
9333Mi MaxObs(Act+Wir+Lndry+SwapUsed)
Reminder: MaximumOfASum <= TheSumOfTheMaximums
Note: The various Maximums need not be from the same time.
By contrast . . .
No FLANG, no MLIR:
---Begin OPTIONS List---
===> The following configuration options are available for llvm13-13.0.1_3:
BE_AMDGPU=on: AMD GPU backend (required by mesa)
BE_WASM=on: WebAssembly backend (required by firefox via wasi)
CLANG=on: Build clang
DOCS=on: Build and/or install documentation
EXTRAS=on: Extra clang tools
FLANG=off: Flang FORTRAN compiler
LIT=on: Install lit and FileCheck test tools
LLD=on: Install lld, the LLVM linker
LLDB=on: Install lldb, the LLVM debugger
MLIR=off: Multi-Level Intermediate Representation
OPENMP=on: Install libomp, the LLVM OpenMP runtime library
PYCLANG=on: Install python bindings to libclang
====> Options available for the single BACKENDS: you have to select exactly one
of them
BE_FREEBSD=off: Backends for FreeBSD architectures
BE_NATIVE=on: Backend(s) for this architecture (AArch64)
BE_STANDARD=off: All non-experimental backends
===> Use 'make config' to modify these settings
---End OPTIONS List---
[11:07:48] [01] [08:58:53] Finished devel/llvm13 | llvm13-13.0.1_3: Success
load averages: . . . MaxObs: 5.31, 4.94, 4.79
1479Mi MaxObs(Act+Lndry+SwapUsed)
So, vastly less RAM+SWAP space use. Somewhat under
5 hours less build time (about 9hr vs. somewhat under 14hr).
===
Mark Millard
marklmi at yahoo.com
