[llvm-dev] LLD issue on a massively parallel build machine

Itaru Kitayama via llvm-dev
Wed, 01 Apr 2020 23:12:05 -0000

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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