Use valgrind's callgrind tool to find out the most time consuming function in your application

  1. Use "$ valgrind --tool=callgrind ./APPLICATION ..." to analyze application performance,
     it will generate a callgrind output(ex:callgrind.out.7722) to help you get performance informations:
      $ valgrind --tool=callgrind ./your_application param1 param2 ...
     
  2. Use kcachegrind tool to visualize callgrind output:
      $ sudo apt-get install kcachegrind
      $ kcachegrind callgrind.out.7722
     
  3. REF: http://baptiste-wicht.com/posts/2011/09/profile-c-application-with-callgrind-kcachegrind.html