jeffreytan81 wrote:
And just for fun, here is an extreme one with 18 seconds of sampling time,
99.6% time is from this hot path. Note: they are all from linux machines
because we only enable perf sampling by default for linux platform so we have
no Mac data.
```
# time of first sample : 2646936.334980
# time of last sample : 2646954.518041
# sample duration : 18183.061 ms
99.63% 0.00% lldb-dap lldb-dap [.] main
|
---main
lldb_dap::DAP::Loop()
lldb_dap::DAP::HandleObject(llvm::json::Object const&)
(anonymous namespace)::request_stackTrace(llvm::json::Object
const&)
|
--99.60%--lldb::SBThread::GetCurrentExceptionBacktrace()
lldb_private::Thread::GetCurrentExceptionBacktrace()
lldb_private::Thread::GetCurrentException()
lldb_private::ItaniumABILanguageRuntime::GetExceptionObjectForThread(std::shared_ptr<lldb_private::Thread>)
|
--99.60%--lldb_private::FunctionCaller::ExecuteFunction(lldb_private::ExecutionContext&,
unsigned long*, lldb_private::EvaluateExpressionOptions const&,
lldb_private::DiagnosticManager&, lldb_private::Value&)
|
|--44.33%--lldb_private::ClangFunctionCaller::CompileFunction(std::shared_ptr<lldb_private::Thread>,
lldb_private::DiagnosticManager&)
| |
|
|--39.56%--lldb_private::ClangExpressionParser::ParseInternal(lldb_private::DiagnosticManager&,
clang::CodeCompleteConsumer*, unsigned int, unsigned int)
| | |
| |
|--21.86%--clang::ParseAST(clang::Sema&, bool, bool)
| | | |
| | |
|--17.47%--clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&,
clang::Sema::ModuleImportState&)
| | | |
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&,
clang::Sema::ModuleImportState&)
| | | |
clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*)
| | | |
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier)
| | | |
clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&,
clang::ParsedAttributes&, clang::ParsingDeclSpec&,
...
```
https://github.com/llvm/llvm-project/pull/104874
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