title: Callgrind: How to use Callgrind tool to evaluate function speed
body: <p>I am interested in testing speed of some function calls from the code written in C/C++. I searched and I was directed to use Valgrind platform with Callgrind tool.</p>
  
  <p>I have briefly read the <a href="http://valgrind.org/docs/manual/cl-manual.html" rel="nofollow">manual</a>, but I am still wondering how I can utilize the functionality of the tool to evaluate the time of my function runtime speed.</p>
  
  <p>I was wondering if I could get some pointers how I can achieve my goal.</p>
  
  <p>Any help would be appreciated.</p>