When you have done this, you can run your program as you normally would run it.
yourexe
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Where yourexe is the name of your executable.
When your program finishes a file called gmon.out is generated. Then you can start the profiler to see the output. You can better redirect the output to a file, becuase it could be quite a lot:
gprof yourexe > profile.log
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Hint: you can use the –flat option to reduce the amount of output of gprof. It will then only output the information about the timings
For more information on the gnu profiler gprof, see its manual.