Re: Any known way to build devel/llvm* ( such as devel/llvm19 ) with --threads=1 for its linker activity during the build?
- Reply: Mark Millard : "Re: Any known way to build devel/llvm* ( such as devel/llvm19 ) with --threads=1 for its linker activity during the build?"
- Reply: meloun.michal_a_gmail.com: "Re: Any known way to build devel/llvm* ( such as devel/llvm19 ) with --threads=1 for its linker activity during the build?"
- In reply to: Mark Millard : "Re: Any known way to build devel/llvm* ( such as devel/llvm19 ) with --threads=1 for its linker activity during the build?"
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Date: Mon, 05 Aug 2024 07:27:13 UTC
On Aug 5, 2024, at 00:15, Mark Millard <marklmi@yahoo.com> wrote: > On Aug 4, 2024, at 22:53, Michal Meloun <meloun.michal@gmail.com> wrote: > >> On 04.08.2024 23:31, Mark Millard wrote: >>> On Aug 3, 2024, at 23:07, Mark Millard <marklmi@yahoo.com> wrote: >>>> My recent attempts to build devel/llvm18 and devel/llvm19 in an armv7 context (native or aarch64-as-armv7) have had /usr/bin/ld failures that stop the build and report as: >>>> >>>> LLVM ERROR: out of memory >>>> Allocation failed >>>> >>>> (no system OOM activity or notices, so just a process size/fragmentation issue, or so I would expect). >>>> >>>> On native armv7 I also had rust 1.79.0 fail that way so --but aarch64-as-armv7 built it okay. >>>> >>>> I'm curious if --threads=1 use for the linker might allow the devel/llvm* builds to complete at this point. Similarly for rust. (top showed that the ld activity was multi-threaded.) >>>> >>>> Note: The structure of the poudriere-devel based native build attempts is historical and it used to work. Similarly for the aarch64-as-armv7 based build attempts. For now I'd just be exploring changes that might allow much of my historical overall structure to still work. But I expect that things are just growing to the point building is starting to be problematical with process address spaces that are bounded by a limit somewhat under 4 GiBytes. >>>> >>>> >>>> Native armv7 was a 2 GiByte OrangePi+ 2ed (4 cores) that had >>>> at boot time: >>>> >>>> AVAIL_RAM+SWAP == 1958Mi+3685Mi == 5643Mi >>>> >>>> and later had "Max(imum)Obs(erved)" figures: >>>> >>>> Mem: . . ., >>>> 1728Mi MaxObsActive, 275192Ki MaxObsWired, 1952Mi MaxObs(Act+Wir+Lndry) >>>> >>>> Swap: 3685Mi Total, . . ., >>>> 1535Mi MaxObsUsed, 3177Mi MaxObs(Act+Lndry+SwapUsed), >>>> 3398Mi MaxObs(A+Wir+L+SU), 3449Mi (A+W+L+SU+InAct) >>>> >>>> >>>> The aarch64-as-armv7 was a Win DevKit 2023 that has 8 cores and: >>>> >>>> AVAIL_RAM+SWAP == 31311Mi+120831Mi == 152142Mi >>>> >>>> So lots of 4 GiByte or smaller processes would fit. >>>> >>> Absent finding a way to get --threads=1 to be what is used, I >>> made the following crude way to test, built it, installed it >>> in the armv7 directory tree used for aarch64-as-armv7, and >>> then started an aarch64-as-armv7 test of building devel/llvm19 >>> to see what the consequences are (leading whitespace details >>> might not be preserved): >>> # git -C /usr/main-src/ diff contrib/llvm-project/ >>> diff --git a/contrib/llvm-project/lld/ELF/Driver.cpp b/contrib/llvm-project/lld/ELF/Driver.cpp >>> index 8b2c32b15348..299daf7dd6fa 100644 >>> --- a/contrib/llvm-project/lld/ELF/Driver.cpp >>> +++ b/contrib/llvm-project/lld/ELF/Driver.cpp >>> @@ -1587,6 +1587,9 @@ static void readConfigs(opt::InputArgList &args) { >>> arg->getValue() + "'"); >>> parallel::strategy = hardware_concurrency(threads); >>> config->thinLTOJobs = v; >>> + } else if (sizeof(void*) <= 4) { >>> + log("set maximum concurrency to 1, specify --threads= to change"); >>> + parallel::strategy = hardware_concurrency(1); >>> } else if (parallel::strategy.compute_thread_count() > 16) { >>> log("set maximum concurrency to 16, specify --threads= to change"); >>> parallel::strategy = hardware_concurrency(16); >>> Basically, if the process address space has to be "small", avoid >>> any default memory use tradeoffs that multi-threading the linker >>> might involve --even if that means taking more time. >>> We will see if: >>> [00:00:33] [07] [00:00:00] Building devel/llvm19@default | llvm19-19.1.0.r1 >>> still fails to build as armv7 vs. if the change leads it to >>> manage to build as armv7. >>> === >>> Mark Millard >>> marklmi at yahoo.com >> >> I can build llvm18 and rust 1.79 on native armv7 without problems - on Tegra TK1, without poudriere and on the ufs filesystem. IMHO poudriere is unusable on 32bit systems. > > On Windows DevKit 2023 in a armv7 chroot I can build rust 1.79.0 > as well. I've not tried a recent devel/llvm18 in that context, > just devel/llvm19 . An armv7 process in this context can use > about 1 GiByte more memory space than on the OrangePi+ 2ed. (See > later program example outputs.) > > Previously, devel/llvm18-18.1.7 had built fine some time back. > So I'm trying the modern 18.1.8_1 now on the Windows DevKit 2023. > But this is with forcing of --threads=1 for lld: same context as > the recent devel/llvm19 exploration. > > Note: UFS context, not ZFS. > > How does the Tegra TK1 context compare for the following > program and the example command? > > OrangePi+ 2ed (so: armv7 native with 2 GiBytes of RAM): > > # more process_size.c > // cc -std=c11 process_size.c > // ./a.out 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 134217728 67108864 33554432 16777216 8388608 4194304 2097152 1048576 > > #include <malloc.h> > #include <errno.h> > #include <stdio.h> > #include <stdlib.h> > #include <limits.h> > > int main(int argc, char *argv[]) > { > size_t totalsize= 0u; > for (int i = 1; i < argc; ++i) { > errno = 0; > size_t size = strtoul(argv[i],NULL,0); > void *p = malloc(size); > if (p) totalsize += size; > printf("malloc(%zu) = %p [errno = %d]\n", size, p, errno); > } > printf("approx. total, a lower bound: %zu MiBytes\n", totalsize/1024u/1024u); > return 0; > } > # cc -std=c11 process_size.c > # ./a.out 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 134217728 67108864 33554432 16777216 8388608 4194304 2097152 1048576 > malloc(268435456) = 0x20800180 [errno = 0] > malloc(268435456) = 0x30801980 [errno = 0] > malloc(268435456) = 0x40802640 [errno = 0] > malloc(268435456) = 0x50803600 [errno = 0] > malloc(268435456) = 0x608048c0 [errno = 0] > malloc(268435456) = 0x70805140 [errno = 0] > malloc(268435456) = 0x80806580 [errno = 0] > malloc(268435456) = 0x90807780 [errno = 0] > malloc(268435456) = 0xa0808700 [errno = 0] > malloc(268435456) = 0x0 [errno = 12] > malloc(268435456) = 0x0 [errno = 12] > malloc(268435456) = 0x0 [errno = 12] > malloc(268435456) = 0x0 [errno = 12] > malloc(134217728) = 0xb0809a00 [errno = 0] > malloc(67108864) = 0x0 [errno = 12] > malloc(33554432) = 0xb880a5c0 [errno = 0] > malloc(16777216) = 0xba80b0c0 [errno = 0] > malloc(8388608) = 0x0 [errno = 12] > malloc(4194304) = 0x0 [errno = 12] > malloc(2097152) = 0xbb80c180 [errno = 0] > malloc(1048576) = 0xbba0de80 [errno = 0] > approx. total, a lower bound: 2483 MiBytes > > > Same program with same command on Windows DevKit 2023 in > armv7 chroot (aarch64-as-armv7 with 32 GiBytes of RAM): > > # ./a.out 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 268435456 134217728 67108864 33554432 16777216 8388608 4194304 2097152 1048576 > malloc(268435456) = 0x20800b00 [errno = 0] > malloc(268435456) = 0x30801600 [errno = 0] > malloc(268435456) = 0x40802cc0 [errno = 0] > malloc(268435456) = 0x50803c80 [errno = 0] > malloc(268435456) = 0x608042c0 [errno = 0] > malloc(268435456) = 0x70805b00 [errno = 0] > malloc(268435456) = 0x808063c0 [errno = 0] > malloc(268435456) = 0x90807580 [errno = 0] > malloc(268435456) = 0xa0808b40 [errno = 0] > malloc(268435456) = 0xb0809980 [errno = 0] > malloc(268435456) = 0xc080abc0 [errno = 0] > malloc(268435456) = 0xd080ba00 [errno = 0] > malloc(268435456) = 0xe080cc80 [errno = 0] > malloc(134217728) = 0xf080d700 [errno = 0] > malloc(67108864) = 0x0 [errno = 12] > malloc(33554432) = 0xf880eb40 [errno = 0] > malloc(16777216) = 0xfa80fc00 [errno = 0] > malloc(8388608) = 0x0 [errno = 12] > malloc(4194304) = 0xfb810840 [errno = 0] > malloc(2097152) = 0xfbc117c0 [errno = 0] > malloc(1048576) = 0xfbe12940 [errno = 0] > approx. total, a lower bound: 3511 MiBytes > > > Note: If the Tegra TK1 in question has more than > 4 GiBytes of RAM, the command line should explore > more than the example that I used. > > > Note: I've used the program for other patterns of > allocations. That is why it is not just a fixed > exploration algorithm. > > > As for poudriere-devel, I find it useful, even on > the OrangePi+ 2ed. But mostly that is a rare run > that is checking on how well the handling goes for > the 2 GiByte of RAM context (with notable SWAP for > the size of RAM). In other words, monitoring the > growth in a context that will break sooner than > my other contexts generally would. The tests take > days overall, most of the time being for rust and > a llvm* . > > Historically I've been able to have 2 builders, > each with MAKE_JOBS_NUMBER_LIMIT=2 , so all 4 > cores in use building lang/rust and a devel/llvm* > at the same time successfully in poudriere-devel > on the 2 GiByte OrangePi+ 2ed. (This was before > recently imposing --threads=1 experiments, > given the recent build failures.) I should have noted that my normal devel/llvm* builds on aarch64 and armv7 avoid building: BE_AMDGPU and MLIR . They also target BE_NATIVE instead of BE_STANDARD . (aarch64 BE_NATIVE includes armv7 as well.) === Mark Millard marklmi at yahoo.com