Hi, Crossposting from node, issue https://github.com/nodejs/node/issues/48581
We have a CPU spike in a node process while no JS is being executed. The time is likely spent in an optimiser thread. Steps to reproduce: run first script in https://gist.github.com/sidorares/128160e6b3dea1da3ad45cd672651d2d#file-repro1-js and watch CPU at 100% for quite some time until the process exits. Stacktrace: * thread #5 * frame #0: 0x0000000101625d24 node`v8::internal::compiler::LoadElimination::AbstractField::Kill(v8::internal::compiler::LoadElimination::AliasStateInfo const&, v8::internal::MaybeHandle<v8::internal::Name>, v8::internal::Zone*) const + 68 frame #1: 0x00000001016287cb node`v8::internal::compiler::LoadElimination::AbstractState::KillFields(v8::internal::compiler::Node*, v8::internal::MaybeHandle<v8::internal::Name>, v8::internal::Zone*) const + 107 frame #2: 0x0000000101623484 node`v8::internal::compiler::LoadElimination::ReduceStoreField(v8::internal::compiler::Node*, v8::internal::compiler::FieldAccess const&) + 900 frame #3: 0x000000010155578a node`v8::internal::compiler::Reducer::Reduce(v8::internal::compiler::Node*, v8::internal::compiler::ObserveNodeManager*) + 26 frame #4: 0x00000001016931e9 node`v8::internal::compiler::(anonymous namespace)::SourcePositionWrapper::Reduce(v8::internal::compiler::Node*) + 57 frame #5: 0x00000001015565aa node`v8::internal::compiler::GraphReducer::Reduce(v8::internal::compiler::Node*) + 154 frame #6: 0x00000001015560f5 node`v8::internal::compiler::GraphReducer::ReduceTop() + 613 frame #7: 0x0000000101555c38 node`v8::internal::compiler::GraphReducer::ReduceNode(v8::internal::compiler::Node*) + 216 frame #8: 0x0000000101693dee node`v8::internal::compiler::LoadEliminationPhase::Run(v8::internal::compiler::PipelineData*, v8::internal::Zone*) + 718 frame #9: 0x000000010168501b node`auto v8::internal::compiler::PipelineImpl::Run<v8::internal::compiler::LoadEliminationPhase>() + 123 frame #10: 0x00000001016818f7 node`v8::internal::compiler::PipelineImpl::OptimizeGraph(v8::internal::compiler::Linkage*) + 455 frame #11: 0x00000001016814fe node`v8::internal::compiler::PipelineCompilationJob::ExecuteJobImpl(v8::internal::RuntimeCallStats*, v8::internal::LocalIsolate*) + 142 frame #12: 0x000000010034a01b node`v8::internal::OptimizedCompilationJob::ExecuteJob(v8::internal::RuntimeCallStats*, v8::internal::LocalIsolate*) + 43 frame #13: 0x00000001003778e3 node`v8::internal::OptimizingCompileDispatcher::CompileNext(v8::internal::TurbofanCompilationJob*, v8::internal::LocalIsolate*) + 35 frame #14: 0x0000000100378359 node`v8::internal::OptimizingCompileDispatcher::CompileTask::RunInternal() + 425 frame #15: 0x000000010015304a node`node::(anonymous namespace)::PlatformWorkerThread(void*) + 362 Is this a known issue/bug? Any hints on 1) how to reduce repro example even more 2) what is causing the issue 3) any flags in node to test with optimiser on/off? Thanks, Andrey -- -- v8-dev mailing list v8-dev@googlegroups.com http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/ad225d64-da80-4b8b-acf1-305f85ef0b34n%40googlegroups.com.
