Friday, April 17, 2020

Profile c++ code

To profile an executable and get a nice visual of it (you need the expected flags when compiled of course):

First you need to compile with argument ''-pg'', so that gcc inserts its code all everywhere to time your function calls.

Once you run the project, it will generate a big file named ''gmon.out''. This is mostly unreadable per se. And ''gprof'' hardly makes it more readable.

Here comes '''' and ''dot'', which generate very readable graphs:
gprof exe/router.exe | -s | dot -Tpng -o profiler.png && gwenview profiler.png

Note that ''gprof'' must be given the executable name. It will not run it in anyway, but it needs the symbol table to give you proper names.

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