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+* good summary of results
+* clang-tidy *.cpp -checks=llvm-*,-llvm-header-guard -header-filter=.* -enable-check-profile -extra-arg="-std=c++17" -extra-arg="-fopenmp" -- *.cpp > gh_codecheck.txt
+
+* (7) you have to use much larger matrices to see some effects
+