https://docs.libreoffice.org/test/html/callgrind_8hxx_source.html
LibreOffice Module test (master): callgrind.hxx Source File
module testlibreofficemasterhxxsource
https://icu.unicode.org/setup/callgrind
ICU - International Components for Unicode - Profiling ICU4C with callgrind
Valgrind, callgrind and kcachegrind together proved performance profiling of C++ code, including annotated source code with time consumption at each line....
international componentsicuunicodeprofiling