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

Alexandre Ganea via llvm-dev llvm-dev at lists.llvm.org
Sat Mar 28 09:32:33 PDT 2020 

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>
Envoyé : March 28, 2020 12:11 PM
À : Itaru Kitayama <itaru.kitayama at gmail.com>
Cc : LLVM Dev <llvm-dev at lists.llvm.org>; Alexandre Ganea <alexandre.ganea at ubisoft.com>; Fāng-ruì Sòng <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
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