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glibc fn's in profiles on zen2 #46

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nickdesaulniers opened this issue Oct 6, 2022 · 0 comments
Open

glibc fn's in profiles on zen2 #46

nickdesaulniers opened this issue Oct 6, 2022 · 0 comments

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@nickdesaulniers
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compared to a profile from #39 on my previous xeon, my zen2 workstation has profiles like:

Samples: 763K of event 'cycles:u', Event count (approx.): 8771740701408
  Overhead  Shared Object                      Symbol
+    2.39%  clang-16                           [.] clang::SourceManager::getFileIDLocal                                                                                                            ◆
+    1.75%  clang-16                           [.] llvm::StringMapImpl::LookupBucketFor                                                                                                            ▒
+    1.52%  libc-2.33.so                       [.] ____wcstod_l_internal                                                                                                                           ▒
+    1.50%  clang-16                           [.] clang::Lexer::LexTokenInternal                                                                                                                  ▒
+    1.43%  clang-16                           [.] clang::TokenLexer::Lex                                                                                                                          ▒
+    1.24%  clang-16                           [.] clang::Preprocessor::Lex                                                                                                                        ▒
+    1.22%  clang-16                           [.] GetFullTypeForDeclarator                                                                                                                        ▒
+    1.20%  libc-2.33.so                       [.] __memmove_ssse3 

it's surprising to see ____wcstod_l_internal and __memmove_ssse3 in there. I wonder if something is wrong with glibc on zen2? Shouldn't memmove be using something newer than sse3?

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