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https://man7.org/linux/man-pages/man1/callgrind_annotate.1.html
callgrind_annotate(1) - Linux manual page
1 linux manualcallgrindannotate
https://blog.josefsson.org/2008/02/27/real-world-performance-tuning-with-callgrind/
Real-world Performance Tuning with Callgrind – Simon Josefsson's blog
real world performancesimon josefssontuningcallgrindblog
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....
icu international componentsunicodeprofilingicu4ccallgrind