[llvm-dev] LLD issue on a massively parallel build machine
Itaru Kitayama via llvm-dev
llvm-dev at lists.llvm.org
Wed Apr 1 16:12:05 PDT 2020
On another login node which is 256 (GB)/48 (nodes) JURECA at JSC, I never
had an LLD issue without setting -j when executing ninja
in the past few weeks.
On Thu, Apr 2, 2020 at 7:17 AM Itaru Kitayama <itaru.kitayama at gmail.com>
wrote:
> Tom,
> Then what ratio do you think it’s minimal?
>
> On Thu, Apr 2, 2020 at 6:11 Tom Stellard <tstellar at redhat.com> wrote:
>
>> On 04/01/2020 01:47 PM, Itaru Kitayama via llvm-dev wrote:
>> > Thanks for the heads up the supercomputer
>> > Is down for maintenance this week.
>> > I’ll give it a try when it gets back.
>> >
>>
>> This doesn't look to me like it's necessarily an lld issue. Trying
>> to build all the sub-projects without limiting the number of ninja jobs
>> is almost guaranteed to run out of memory on a machine like this with such
>> a low memory:core ratio.
>>
>> -Tom
>>
>> > On Thu, Apr 2, 2020 at 1:49 Fangrui Song <maskray at google.com <mailto:
>> maskray at google.com>> wrote:
>> >
>> > On 2020-03-29, Nemanja Ivanovic via llvm-dev wrote:
>> > >Glad you got it working.
>> > >My suggestion about LLVM_ENABLE_THREADS didn't work because you
>> didn't
>> > >apply it when building the build linker.
>> > >
>> > >When you don't have the ability to rebuild the build compiler,
>> this doesn't
>> > >apply. In those cases, I end up doing a dirty hack where I use a
>> wrapper
>> > >script with something like:
>> > >
>> > ><path-to-build-compiler> "$@" -Wl,--no-threads
>> > >
>> > >To invoke the build compiler. That way you still get full
>> parallelism while
>> > >compiling and linking, but you prevent LLD from using threads.
>> >
>> >
>> > https://reviews.llvm.org/D76885 (committed yesterday) changed
>> > --no-threads to --threads={1,2,...} (--no-threads is used rarely
>> (GNU ld
>> > does not support it) so I'd rather not keep the option for
>> > compatibility).
>> >
>> > You may try -Wl,--threads=1
>> >
>> > >On Sat., Mar. 28, 2020, 4:19 p.m. Itaru Kitayama, <
>> itaru.kitayama at gmail.com <mailto:itaru.kitayama at gmail.com>>
>> > >wrote:
>> > >
>> > >> Good news, I was able to use up to 37 cores for LLVM build with
>> LLD.
>> > >> The build speed, did not measure precisely though, is comparable
>> to the
>> > >> build with GNU ld case.
>> > >>
>> > >> Thank you all for your help!
>> > >>
>> > >> On Sun, Mar 29, 2020 at 5:04 AM Alex Brachet-Mialot <
>> > >> alexbrachetmialot at gmail.com <mailto:alexbrachetmialot at gmail.com>>
>> wrote:
>> > >>
>> > >>> Yes unfortunately that would limit you to 4 cores.
>> > >>>
>> > >>> There’s no easy way to use lld with —no-threads with our build
>> system at
>> > >>> the moment unfortunately.
>> > >>>
>> > >>> I also had just been using ld.gold, but will switch now that
>> numactl
>> > >>> works for me.
>> > >>>
>> > >>> On Sat, Mar 28, 2020 at 3:58 PM Itaru Kitayama <
>> itaru.kitayama at gmail.com <mailto:itaru.kitayama at gmail.com>>
>> > >>> wrote:
>> > >>>
>> > >>>> That is slowing down the build visibly, for the speed I should
>> stick
>> > >>>> with ld at the moment.
>> > >>>>
>> > >>>>
>> > >>>> On Sun, Mar 29, 2020 at 4:42 AM Alexandre Ganea <
>> > >>>> alexandre.ganea at ubisoft.com <mailto:
>> alexandre.ganea at ubisoft.com>> wrote:
>> > >>>>
>> > >>>>> Would `taskset -c 0-3 ninja check-all -j4` work?
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> *De :* Itaru Kitayama <itaru.kitayama at gmail.com <mailto:
>> itaru.kitayama at gmail.com>>
>> > >>>>> *Envoyé :* March 28, 2020 3:37 PM
>> > >>>>> *À :* Alex Brachet-Mialot <alexbrachetmialot at gmail.com
>> <mailto:alexbrachetmialot at gmail.com>>
>> > >>>>> *Cc :* Alexandre Ganea <alexandre.ganea at ubisoft.com <mailto:
>> alexandre.ganea at ubisoft.com>>; LLVM Dev <
>> > >>>>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>;
>> Nemanja Ivanovic <nemanja.i.ibm at gmail.com <mailto:nemanja.i.ibm at gmail.com
>> >>
>> > >>>>> *Objet :* Re: [llvm-dev] LLD issue on a massively parallel
>> build
>> > >>>>> machine
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> $ free -g
>> > >>>>> total used free shared
>> buff/cache
>> > >>>>> available
>> > >>>>> Mem: 376 149 20 1
>> 207
>> > >>>>> 225
>> > >>>>> Swap: 3 0 3
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> Too small swap size for a 72-core login machine?
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> On Sun, Mar 29, 2020 at 4:28 AM Alex Brachet-Mialot <
>> > >>>>> alexbrachetmialot at gmail.com <mailto:
>> alexbrachetmialot at gmail.com>> wrote:
>> > >>>>>
>> > >>>>> Enable threads is for building llvm with or without thread
>> support. To
>> > >>>>> my knowledge it has no effect on the build system.
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> Like was discussed above you could try limiting the number of
>> > >>>>> processes created (assuming your lld was after that commit)
>> with numactl or
>> > >>>>> taskset.
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> In your case though it looked like you were running out of
>> memory. You
>> > >>>>> could try increasing your swap space?
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> Alex
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> On Sat, Mar 28, 2020 at 3:15 PM Itaru Kitayama <
>> > >>>>> itaru.kitayama at gmail.com <mailto:itaru.kitayama at gmail.com>>
>> wrote:
>> > >>>>>
>> > >>>>> Hi,
>> > >>>>>
>> > >>>>> My configuration is below:
>> > >>>>>
>> > >>>>> cmake -GNinja -DLLVM_ENABLE_LLD=ON -DLLVM_ENABLE_THREADS=OFF
>> > >>>>> -DLLVM_ENABLE_LIBCXX=ON -DCMAKE_BUILD_TYPE=Release
>> > >>>>> -DGCC_INSTALL_PREFIX=/home/usr4/c74014i/opt/gcc-7.5.0/
>> > >>>>> -DLIBOMPTARGET_ENABLE_DEBUG=ON
>> > >>>>> -DCMAKE_INSTALL_PREFIX=$HOME/opt/clang/${today}
>> -DCMAKE_C_COMPILER=clang
>> > >>>>> -DCMAKE_C_FLAGS="" -DCMAKE_CXX_COMPILER=clang++
>> -DCMAKE_CXX_FLAGS=""
>> > >>>>>
>> -DLLVM_ENABLE_PROJECTS="clang;openmp;lld;libcxx;libcxxabi;compiler-rt;libunwind"
>> > >>>>> -DCLANG_OPENMP_NVPTX_DEFAULT_ARCH=sm_60
>> > >>>>> -DLIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES=60
>> -DLLVM_TARGETS_TO_BUILD="all"
>> > >>>>> /tmp/llvm-project/llvm
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> but did not help my case:
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> [...]
>> > >>>>>
>> > >>>>> [4802/5201] Linking CXX executable bin/lld
>> > >>>>> FAILED: bin/lld
>> > >>>>> : && /home/usr4/c74014i/opt/clang/current/bin/clang++
>> -stdlib=libc++
>> > >>>>> -fPIC -fvisibility-inlines-hidden -Werror=date-time
>> > >>>>> -Werror=unguarded-availability-new -Wall -Wextra
>> -Wno-unused-parameter
>> > >>>>> -Wwrite-strings -Wcast-qual -Wmissing-field-initializers
>> -pedantic
>> > >>>>> -Wno-long-long -Wimplicit-fallthrough -Wcovered-switch-default
>> > >>>>> -Wno-noexcept-type -Wnon-virtual-dtor
>> -Wdelete-non-virtual-dtor
>> > >>>>> -Wstring-conversion -fdiagnostics-color -ffunction-sections
>> -fdata-sections
>> > >>>>> -O3 -DNDEBUG -stdlib=libc++ -fuse-ld=lld
>> -Wl,--color-diagnostics
>> > >>>>> -Wl,-allow-shlib-undefined -Wl,--export-dynamic -Wl,-O3
>> > >>>>> tools/lld/tools/lld/CMakeFiles/lld.dir/lld.cpp.o -o bin/lld
>> > >>>>> -Wl,-rpath,"\$ORIGIN/../lib" lib/libLLVMSupport.a -lpthread
>> > >>>>> lib/liblldCommon.a lib/liblldCOFF.a lib/liblldDriver.a
>> lib/liblldELF.a
>> > >>>>> lib/liblldMinGW.a lib/liblldWasm.a lib/liblldMachO.a
>> > >>>>> lib/liblldReaderWriter.a lib/liblldYAML.a lib/liblldCore.a
>> > >>>>> lib/liblldCOFF.a lib/libLLVMDebugInfoPDB.a
>> lib/libLLVMLibDriver.a
>> > >>>>> lib/libLLVMWindowsManifest.a /usr/lib64/libxml2.so
>> lib/liblldCommon.a
>> > >>>>> lib/libLLVMOption.a lib/libLLVMAArch64CodeGen.a
>> > >>>>> lib/libLLVMAArch64AsmParser.a
>> lib/libLLVMAArch64Disassembler.a
>> > >>>>> lib/libLLVMAArch64Desc.a lib/libLLVMAArch64Info.a
>> > >>>>> lib/libLLVMAArch64Utils.a lib/libLLVMAMDGPUCodeGen.a
>> > >>>>> lib/libLLVMMIRParser.a lib/libLLVMAMDGPUAsmParser.a
>> > >>>>> lib/libLLVMAMDGPUDisassembler.a lib/libLLVMAMDGPUDesc.a
>> > >>>>> lib/libLLVMAMDGPUInfo.a lib/libLLVMAMDGPUUtils.a
>> lib/libLLVMARMCodeGen.a
>> > >>>>> lib/libLLVMARMAsmParser.a lib/libLLVMARMDisassembler.a
>> > >>>>> lib/libLLVMARMDesc.a lib/libLLVMARMInfo.a
>> lib/libLLVMARMUtils.a
>> > >>>>> lib/libLLVMAVRCodeGen.a lib/libLLVMAVRAsmParser.a
>> lib/libLLVMAVRDesc.a
>> > >>>>> lib/libLLVMAVRDisassembler.a lib/libLLVMAVRInfo.a
>> > >>>>> lib/libLLVMBPFCodeGen.a lib/libLLVMBPFAsmParser.a
>> lib/libLLVMBPFDesc.a
>> > >>>>> lib/libLLVMBPFDisassembler.a lib/libLLVMBPFInfo.a
>> > >>>>> lib/libLLVMHexagonCodeGen.a lib/libLLVMHexagonAsmParser.a
>> > >>>>> lib/libLLVMHexagonDisassembler.a lib/libLLVMHexagonDesc.a
>> > >>>>> lib/libLLVMHexagonInfo.a lib/libLLVMLanaiCodeGen.a
>> > >>>>> lib/libLLVMLanaiAsmParser.a lib/libLLVMLanaiDisassembler.a
>> > >>>>> lib/libLLVMLanaiDesc.a lib/libLLVMLanaiInfo.a
>> lib/libLLVMMipsCodeGen.a
>> > >>>>> lib/libLLVMMipsAsmParser.a lib/libLLVMMipsDesc.a
>> > >>>>> lib/libLLVMMipsDisassembler.a lib/libLLVMMipsInfo.a
>> > >>>>> lib/libLLVMMSP430CodeGen.a lib/libLLVMMSP430AsmParser.a
>> > >>>>> lib/libLLVMMSP430Desc.a lib/libLLVMMSP430Disassembler.a
>> > >>>>> lib/libLLVMMSP430Info.a lib/libLLVMNVPTXCodeGen.a
>> lib/libLLVMNVPTXDesc.a
>> > >>>>> lib/libLLVMNVPTXInfo.a lib/libLLVMPowerPCCodeGen.a
>> > >>>>> lib/libLLVMPowerPCAsmParser.a lib/libLLVMPowerPCDesc.a
>> > >>>>> lib/libLLVMPowerPCDisassembler.a lib/libLLVMPowerPCInfo.a
>> > >>>>> lib/libLLVMRISCVCodeGen.a lib/libLLVMRISCVAsmParser.a
>> > >>>>> lib/libLLVMRISCVDesc.a lib/libLLVMRISCVDisassembler.a
>> > >>>>> lib/libLLVMRISCVInfo.a lib/libLLVMRISCVUtils.a
>> lib/libLLVMSparcCodeGen.a
>> > >>>>> lib/libLLVMSparcAsmParser.a lib/libLLVMSparcDesc.a
>> > >>>>> lib/libLLVMSparcDisassembler.a lib/libLLVMSparcInfo.a
>> > >>>>> lib/libLLVMSystemZCodeGen.a lib/libLLVMSystemZAsmParser.a
>> > >>>>> lib/libLLVMSystemZDisassembler.a lib/libLLVMSystemZDesc.a
>> > >>>>> lib/libLLVMSystemZInfo.a lib/libLLVMWebAssemblyCodeGen.a
>> > >>>>> lib/libLLVMWebAssemblyAsmParser.a
>> lib/libLLVMWebAssemblyDisassembler.a
>> > >>>>> lib/libLLVMWebAssemblyDesc.a lib/libLLVMWebAssemblyInfo.a
>> > >>>>> lib/libLLVMX86CodeGen.a lib/libLLVMCFGuard.a
>> lib/libLLVMGlobalISel.a
>> > >>>>> lib/libLLVMX86AsmParser.a lib/libLLVMX86Desc.a
>> > >>>>> lib/libLLVMX86Disassembler.a lib/libLLVMX86Info.a
>> lib/libLLVMX86Utils.a
>> > >>>>> lib/libLLVMXCoreCodeGen.a lib/libLLVMAsmPrinter.a
>> > >>>>> lib/libLLVMDebugInfoDWARF.a lib/libLLVMSelectionDAG.a
>> > >>>>> lib/libLLVMXCoreDesc.a lib/libLLVMXCoreDisassembler.a
>> > >>>>> lib/libLLVMMCDisassembler.a lib/libLLVMXCoreInfo.a
>> lib/libLLVMLTO.a
>> > >>>>> lib/libLLVMObjCARCOpts.a lib/libLLVMPasses.a
>> lib/libLLVMCodeGen.a
>> > >>>>> lib/libLLVMTarget.a lib/libLLVMCoroutines.a
>> lib/libLLVMipo.a
>> > >>>>> lib/libLLVMBitWriter.a lib/libLLVMScalarOpts.a
>> lib/libLLVMVectorize.a
>> > >>>>> lib/libLLVMAggressiveInstCombine.a lib/libLLVMInstCombine.a
>> > >>>>> lib/libLLVMLinker.a lib/libLLVMFrontendOpenMP.a
>> lib/libLLVMIRReader.a
>> > >>>>> lib/libLLVMAsmParser.a lib/libLLVMInstrumentation.a
>> > >>>>> lib/libLLVMTransformUtils.a lib/libLLVMAnalysis.a
>> lib/libLLVMObject.a
>> > >>>>> lib/libLLVMBitReader.a lib/libLLVMMCParser.a
>> lib/libLLVMMC.a
>> > >>>>> lib/libLLVMDebugInfoCodeView.a lib/libLLVMDebugInfoMSF.a
>> > >>>>> lib/libLLVMTextAPI.a lib/libLLVMProfileData.a
>> lib/libLLVMCore.a
>> > >>>>> lib/libLLVMBinaryFormat.a lib/libLLVMRemarks.a
>> > >>>>> lib/libLLVMBitstreamReader.a lib/libLLVMSupport.a -lz
>> -lrt -ldl
>> > >>>>> -ltinfo -lpthread -lm lib/libLLVMDemangle.a && cd
>> > >>>>> /tmp/build/202003290405/tools/lld/tools/lld &&
>> > >>>>> /home/usr4/c74014i/opt/cmake-3.16.3-Linux-x86_64/bin/cmake -E
>> > >>>>> create_symlink lld /tmp/build/202003290405/./bin/lld-link &&
>> cd
>> > >>>>> /tmp/build/202003290405/tools/lld/tools/lld &&
>> > >>>>> /home/usr4/c74014i/opt/cmake-3.16.3-Linux-x86_64/bin/cmake -E
>> > >>>>> create_symlink lld /tmp/build/202003290405/./bin/ld.lld && cd
>> > >>>>> /tmp/build/202003290405/tools/lld/tools/lld &&
>> > >>>>> /home/usr4/c74014i/opt/cmake-3.16.3-Linux-x86_64/bin/cmake -E
>> > >>>>> create_symlink lld /tmp/build/202003290405/./bin/ld64.lld &&
>> cd
>> > >>>>> /tmp/build/202003290405/tools/lld/tools/lld &&
>> > >>>>> /home/usr4/c74014i/opt/cmake-3.16.3-Linux-x86_64/bin/cmake -E
>> > >>>>> create_symlink lld /tmp/build/202003290405/./bin/wasm-ld
>> > >>>>> terminating with uncaught exception of type
>> std::__1::system_error:
>> > >>>>> thread constructor failed: Resource temporarily unavailable
>> > >>>>> PLEASE submit a bug report to https://bugs.llvm.org/ and
>> include the
>> > >>>>> crash backtrace.
>> > >>>>> #0 0x00000000007924f4 PrintStackTraceSignalHandler(void*)
>> > >>>>> (/home/usr4/c74014i/opt/clang/current/bin/ld.lld+0x7924f4)
>> > >>>>> #1 0x00000000007902ce llvm::sys::RunSignalHandlers()
>> > >>>>> (/home/usr4/c74014i/opt/clang/current/bin/ld.lld+0x7902ce)
>> > >>>>> #2 0x0000000000792bd5 SignalHandler(int)
>> > >>>>> (/home/usr4/c74014i/opt/clang/current/bin/ld.lld+0x792bd5)
>> > >>>>> #3 0x00007fddd54bb630 __restore_rt
>> (/lib64/libpthread.so.0+0xf630)
>> > >>>>> #4 0x00007fddd3b40377 raise
>> > >>>>>
>> /usr/src/debug/glibc-2.17-c758a686/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:55:0
>> > >>>>> #5 0x00007fddd3b41a68 abort
>> > >>>>> /usr/src/debug/glibc-2.17-c758a686/stdlib/abort.c:92:0
>> > >>>>> #6 0x00007fddd411ae8b
>> > >>>>>
>> (/home/usr4/c74014i/opt/clang/202003290200/bin/../lib/libc++abi.so.1+0x2be8b)
>> > >>>>> #7 0x00007fddd40fdb9f demangling_terminate_handler()
>> > >>>>>
>> (/home/usr4/c74014i/opt/clang/202003290200/bin/../lib/libc++abi.so.1+0xeb9f)
>> > >>>>> #8 0x00007fddd411a0a3 std::__terminate(void (*)())
>> > >>>>>
>> (/home/usr4/c74014i/opt/clang/202003290200/bin/../lib/libc++abi.so.1+0x2b0a3)
>> > >>>>> #9 0x00007fddd411ce06
>> > >>>>>
>> (/home/usr4/c74014i/opt/clang/202003290200/bin/../lib/libc++abi.so.1+0x2de06)
>> > >>>>> #10 0x00007fddd411cd9f
>> > >>>>>
>> (/home/usr4/c74014i/opt/clang/202003290200/bin/../lib/libc++abi.so.1+0x2dd9f)
>> > >>>>> #11 0x00007fddd43bded4 std::__1::__throw_system_error(int,
>> char const*)
>> > >>>>>
>> (/home/usr4/c74014i/opt/clang/202003290200/bin/../lib/libc++.so.1+0x90ed4)
>> > >>>>> #12 0x0000000002a7a316 void*
>> > >>>>>
>> std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct,
>> > >>>>> std::__1::default_delete<std::__1::__thread_struct> >,
>> > >>>>> llvm::parallel::detail::(anonymous
>> > >>>>>
>> namespace)::ThreadPoolExecutor::ThreadPoolExecutor(llvm::ThreadPoolStrategy)::'lambda'()>
>> > >>>>> >(void*)
>> (/home/usr4/c74014i/opt/clang/current/bin/ld.lld+0x2a7a316)
>> > >>>>> #13 0x00007fddd54b3ea5 start_thread
>> > >>>>> /usr/src/debug/glibc-2.17-c758a686/nptl/pthread_create.c:307:0
>> > >>>>> #14 0x00007fddd3c088cd clone
>> > >>>>>
>> /usr/src/debug////////glibc-2.17-c758a686/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:113:0
>> > >>>>> clang-11: error: unable to execute command: Aborted
>> > >>>>> clang-11: error: linker command failed due to signal (use -v
>> to see
>> > >>>>> invocation)
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> On Sun, Mar 29, 2020 at 1:44 AM Nemanja Ivanovic <
>> > >>>>> nemanja.i.ibm at gmail.com <mailto:nemanja.i.ibm at gmail.com>>
>> wrote:
>> > >>>>>
>> > >>>>> The discussion in https://reviews.llvm.org/D76240
>> > >>>>>
>> > >>>>> may be of interest to the participants of this thread.
>> Specifically,
>> > >>>>> Fangrui's planned work on a command line option to limit
>> threads for LLD.
>> > >>>>> Until that becomes a reality, you might want to use the CMake
>> variable
>> > >>>>> -DLLVM_ENABLE_THREADS=OFF when building the LLD that you are
>> using to
>> > >>>>> prevent parallelism.
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> On Sat, Mar 28, 2020 at 12:32 PM Alexandre Ganea via llvm-dev
>> <
>> > >>>>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>
>> wrote:
>> > >>>>>
>> > >>>>> Alex :
>> > >>>>>
>> > >>>>> Can you please try `numactl` or `taskset` after
>> > >>>>>
>> https://github.com/llvm/llvm-project/commit/09158252f777c2e2f06a86b154c44abcbcf9bb74
>> > >>>>> ?
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> There was a tiny bug in how *sched_getaffinity*() was used,
>> see:
>> > >>>>> https://reviews.llvm.org/D75153#1942336
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> *De :* Alex Brachet-Mialot <alexbrachetmialot at gmail.com
>> <mailto:alexbrachetmialot at gmail.com>>
>> > >>>>> *Envoyé :* March 28, 2020 12:11 PM
>> > >>>>> *À :* Itaru Kitayama <itaru.kitayama at gmail.com <mailto:
>> itaru.kitayama at gmail.com>>
>> > >>>>> *Cc :* LLVM Dev <llvm-dev at lists.llvm.org <mailto:
>> llvm-dev at lists.llvm.org>>; Alexandre Ganea <
>> > >>>>> alexandre.ganea at ubisoft.com <mailto:
>> alexandre.ganea at ubisoft.com>>; Fāng-ruì Sòng <maskray at google.com <mailto:
>> maskray at google.com>>
>> > >>>>> *Objet :* Re: [llvm-dev] LLD issue on a massively parallel
>> build
>> > >>>>> machine
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> I also run into problems with lld on machines with lots of
>> cores (208),
>> > >>>>> but I run into rlimits for number of processes I can create,
>> something
>> > >>>>> outside of my control.
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> Unfortunately things like numactl or taskset do not limit the
>> > >>>>> concurrency of lld currently.
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> On Sat, Mar 28, 2020 at 4:10 AM Itaru Kitayama via llvm-dev <
>> > >>>>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>
>> wrote:
>> > >>>>>
>> > >>>>> Hi,
>> > >>>>>
>> > >>>>> On a 1296-core Intel machine with 376 GB, setting
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> -DLLVM_PARALLEL_LINK_JOB=1
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> does not help (switching back to ld scales) see:
>> > >>>>>
>> > >>>>>
>> > >>>>>
>> > >>>>> [5085/5201] Linking CXX executable bin/clang-11
>> > >>>>> FAILED: bin/clang-11
>> > >>>>> : && /home/usr4/c74014i/opt/clang/current/bin/clang++
>> -stdlib=libc++
>> > >>>>> -fPIC -fvisibility-inlines-hidden -Werror=date-time
>> > >>>>> -Werror=unguarded-availability-new -Wall -Wextra
>> -Wno-unused-parameter
>> > >>>>> -Wwrite-strings -Wcast-qual -Wmissing-field-initializers
>> -pedantic
>> > >>>>> -Wno-long-long -Wimplicit-fallthrough -Wcovered-switch-default
>> > >>>>> -Wno-noexcept-type -Wnon-virtual-dtor
>> -Wdelete-non-virtual-dtor
>> > >>>>> -Wstring-conversion -fdiagnostics-color -ffunction-sections
>> -fdata-sections
>> > >>>>> -fno-common -Woverloaded-virtual -Wno-nested-anon-types -O3
>> -DNDEBUG
>> > >>>>> -stdlib=libc++ -fuse-ld=lld -Wl,--color-diagnostics
>> > >>>>> -Wl,-allow-shlib-undefined -Wl,--export-dynamic -Wl,-O3
>> > >>>>> tools/clang/tools/driver/CMakeFiles/clang.dir/driver.cpp.o
>> > >>>>> tools/clang/tools/driver/CMakeFiles/clang.dir/cc1_main.cpp.o
>> > >>>>> tools/clang/tools/driver/CMakeFiles/clang.dir/cc1as_main.cpp.o
>> > >>>>>
>> tools/clang/tools/driver/CMakeFiles/clang.dir/cc1gen_reproducer_main.cpp.o
>> > >>>>> -o bin/clang-11 -Wl,-rpath,"\$ORIGIN/../lib"
>> lib/libLLVMAArch64CodeGen.a
>> > >>>>> lib/libLLVMAArch64AsmParser.a lib/libLLVMAArch64Desc.a
>> > >>>>> lib/libLLVMAArch64Disassembler.a lib/libLLVMAArch64Info.a
>> > >>>>> lib/libLLVMAArch64Utils.a lib/libLLVMAMDGPUCodeGen.a
>> > >>>>> lib/libLLVMAMDGPUAsmParser.a lib/libLLVMAMDGPUDesc.a
>> > >>>>> lib/libLLVMAMDGPUDisassembler.a lib/libLLVMAMDGPUInfo.a
>> > >>>>> lib/libLLVMAMDGPUUtils.a lib/libLLVMARMCodeGen.a
>> > >>>>> lib/libLLVMARMAsmParser.a lib/libLLVMARMDesc.a
>> > >>>>> lib/libLLVMARMDisassembler.a lib/libLLVMARMInfo.a
>> lib/libLLVMARMUtils.a
>> > >>>>> lib/libLLVMAVRCodeGen.a lib/libLLVMAVRAsmParser.a
>> lib/libLLVMAVRDesc.a
>> > >>>>> lib/libLLVMAVRDisassembler.a lib/libLLVMAVRInfo.a
>> > >>>>> lib/libLLVMBPFCodeGen.a lib/libLLVMBPFAsmParser.a
>> lib/libLLVMBPFDesc.a
>> > >>>>> lib/libLLVMBPFDisassembler.a lib/libLLVMBPFInfo.a
>> > >>>>> lib/libLLVMHexagonCodeGen.a lib/libLLVMHexagonAsmParser.a
>> > >>>>> lib/libLLVMHexagonDesc.a lib/libLLVMHexagonDisassembler.a
>> > >>>>> lib/libLLVMHexagonInfo.a lib/libLLVMLanaiCodeGen.a
>> > >>>>> lib/libLLVMLanaiAsmParser.a lib/libLLVMLanaiDesc.a
>> > >>>>> lib/libLLVMLanaiDisassembler.a lib/libLLVMLanaiInfo.a
>> > >>>>> lib/libLLVMMipsCodeGen.a lib/libLLVMMipsAsmParser.a
>> > >>>>> lib/libLLVMMipsDesc.a lib/libLLVMMipsDisassembler.a
>> > >>>>> lib/libLLVMMipsInfo.a lib/libLLVMMSP430CodeGen.a
>> > >>>>> lib/libLLVMMSP430AsmParser.a lib/libLLVMMSP430Desc.a
>> > >>>>> lib/libLLVMMSP430Disassembler.a lib/libLLVMMSP430Info.a
>> > >>>>> lib/libLLVMNVPTXCodeGen.a lib/libLLVMNVPTXDesc.a
>> lib/libLLVMNVPTXInfo.a
>> > >>>>> lib/libLLVMPowerPCCodeGen.a lib/libLLVMPowerPCAsmParser.a
>> > >>>>> lib/libLLVMPowerPCDesc.a lib/libLLVMPowerPCDisassembler.a
>> > >>>>> lib/libLLVMPowerPCInfo.a lib/libLLVMRISCVCodeGen.a
>> > >>>>> lib/libLLVMRISCVAsmParser.a lib/libLLVMRISCVDesc.a
>> > >>>>> lib/libLLVMRISCVDisassembler.a lib/libLLVMRISCVInfo.a
>> > >>>>> lib/libLLVMRISCVUtils.a lib/libLLVMSparcCodeGen.a
>> > >>>>> lib/libLLVMSparcAsmParser.a lib/libLLVMSparcDesc.a
>> > >>>>> lib/libLLVMSparcDisassembler.a lib/libLLVMSparcInfo.a
>> > >>>>> lib/libLLVMSystemZCodeGen.a lib/libLLVMSystemZAsmParser.a
>> > >>>>> lib/libLLVMSystemZDesc.a lib/libLLVMSystemZDisassembler.a
>> > >>>>> lib/libLLVMSystemZInfo.a lib/libLLVMWebAssemblyCodeGen.a
>> > >>>>> lib/libLLVMWebAssemblyAsmParser.a
>> lib/libLLVMWebAssemblyDesc.a
>> > >>>>> lib/libLLVMWebAssemblyDisassembler.a
>> lib/libLLVMWebAssemblyInfo.a
>> > >>>>> lib/libLLVMX86CodeGen.a lib/libLLVMX86AsmParser.a
>> lib/libLLVMX86Desc.a
>> > >>>>> lib/libLLVMX86Disassembler.a lib/libLLVMX86Info.a
>> lib/libLLVMX86Utils.a
>> > >>>>> lib/libLLVMXCoreCodeGen.a lib/libLLVMXCoreDesc.a
>> > >>>>> lib/libLLVMXCoreDisassembler.a lib/libLLVMXCoreInfo.a
>> > >>>>> lib/libLLVMAnalysis.a lib/libLLVMCodeGen.a
>> lib/libLLVMCore.a
>> > >>>>> lib/libLLVMipo.a lib/libLLVMAggressiveInstCombine.a
>> > >>>>> lib/libLLVMInstCombine.a lib/libLLVMInstrumentation.a
>> lib/libLLVMMC.a
>> > >>>>> lib/libLLVMMCParser.a lib/libLLVMObjCARCOpts.a
>> lib/libLLVMOption.a
>> > >>>>> lib/libLLVMScalarOpts.a lib/libLLVMSupport.a
>> lib/libLLVMTransformUtils.a
>> > >>>>> lib/libLLVMVectorize.a -lpthread lib/libclangBasic.a
>> > >>>>> lib/libclangCodeGen.a lib/libclangDriver.a
>> lib/libclangFrontend.a
>> > >>>>> lib/libclangFrontendTool.a lib/libclangSerialization.a
>> > >>>>> lib/libLLVMAArch64Desc.a lib/libLLVMAArch64Info.a
>> > >>>>> lib/libLLVMAArch64Utils.a lib/libLLVMMIRParser.a
>> lib/libLLVMAMDGPUDesc.a
>> > >>>>> lib/libLLVMAMDGPUInfo.a lib/libLLVMAMDGPUUtils.a
>> lib/libLLVMARMDesc.a
>> > >>>>> lib/libLLVMARMInfo.a lib/libLLVMARMUtils.a
>> lib/libLLVMHexagonDesc.a
>> > >>>>> lib/libLLVMHexagonInfo.a lib/libLLVMLanaiDesc.a
>> lib/libLLVMLanaiInfo.a
>> > >>>>> lib/libLLVMSystemZDesc.a lib/libLLVMSystemZInfo.a
>> > >>>>> lib/libLLVMWebAssemblyDesc.a lib/libLLVMWebAssemblyInfo.a
>> > >>>>> lib/libLLVMCFGuard.a lib/libLLVMGlobalISel.a
>> lib/libLLVMAsmPrinter.a
>> > >>>>> lib/libLLVMDebugInfoDWARF.a lib/libLLVMSelectionDAG.a
>> > >>>>> lib/libLLVMMCDisassembler.a lib/libclangCodeGen.a
>> lib/libLLVMCoverage.a
>> > >>>>> lib/libLLVMLTO.a lib/libLLVMObjCARCOpts.a
>> lib/libLLVMPasses.a
>> > >>>>> lib/libLLVMCodeGen.a lib/libLLVMTarget.a
>> lib/libLLVMCoroutines.a
>> > >>>>> lib/libLLVMipo.a lib/libLLVMInstrumentation.a
>> lib/libLLVMVectorize.a
>> > >>>>> lib/libLLVMBitWriter.a lib/libLLVMIRReader.a
>> lib/libLLVMAsmParser.a
>> > >>>>> lib/libLLVMLinker.a lib/libLLVMScalarOpts.a
>> > >>>>> lib/libLLVMAggressiveInstCombine.a lib/libLLVMInstCombine.a
>> > >>>>> lib/libclangRewriteFrontend.a lib/libclangARCMigrate.a
>> > >>>>> lib/libclangStaticAnalyzerFrontend.a
>> lib/libclangStaticAnalyzerCheckers.a
>> > >>>>> lib/libclangStaticAnalyzerCore.a lib/libclangCrossTU.a
>> > >>>>> lib/libclangIndex.a lib/libclangFrontend.a
>> lib/libclangDriver.a
>> > >>>>> lib/libLLVMOption.a lib/libclangParse.a
>> lib/libclangSerialization.a
>> > >>>>> lib/libclangSema.a lib/libclangAnalysis.a
>> lib/libclangASTMatchers.a
>> > >>>>> lib/libclangEdit.a lib/libclangFormat.a
>> lib/libclangToolingInclusions.a
>> > >>>>> lib/libclangToolingCore.a lib/libclangAST.a
>> lib/libLLVMFrontendOpenMP.a
>> > >>>>> lib/libLLVMTransformUtils.a lib/libLLVMAnalysis.a
>> > >>>>> lib/libLLVMProfileData.a lib/libLLVMObject.a
>> lib/libLLVMMCParser.a
>> > >>>>> lib/libLLVMBitReader.a lib/libLLVMTextAPI.a
>> lib/libclangRewrite.a
>> > >>>>> lib/libclangLex.a lib/libclangBasic.a lib/libLLVMCore.a
>> > >>>>> lib/libLLVMRemarks.a lib/libLLVMBitstreamReader.a
>> lib/libLLVMMC.a
>> > >>>>> lib/libLLVMBinaryFormat.a lib/libLLVMDebugInfoCodeView.a
>> > >>>>> lib/libLLVMDebugInfoMSF.a lib/libLLVMSupport.a -lz -lrt
>> -ldl -ltinfo
>> > >>>>> -lpthread -lm lib/libLLVMDemangle.a && :
>> > >>>>> ld.lld: error: failed to open bin/clang-11: Cannot allocate
>> memory
>> > >>>>>
>> > >>>>> _______________________________________________
>> > >>>>> LLVM Developers mailing list
>> > >>>>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>> > >>>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> > >>>>>
>> > >>>>> _______________________________________________
>> > >>>>> LLVM Developers mailing list
>> > >>>>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>> > >>>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> > >>>>>
>> > >>>>>
>> >
>> > >_______________________________________________
>> > >LLVM Developers mailing list
>> > >llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>> > >https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> >
>> >
>> >
>> > _______________________________________________
>> > LLVM Developers mailing list
>> > llvm-dev at lists.llvm.org
>> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> >
>>
>>
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