How to find the CUP time used by each function in my code?

Dear All,

I want to know the CPU time used by each function of my code. I donot know if it is possible. I donot want to use tic/toc because I need to set up many tic/toc.

Thanks a lot.

Benson

Answer 1

[Paul Hoffrichter]

If you need a profile of the relative time spent in every function when running your entire script, then while viewing the main program script in the EDITOR section, you can hit the "Run and Time" button instead of the "Run" button. The resultant summary does not give you CPU time, but only relative times. When you see a function taking up most of the time, you can delve into its hyperlink and get a time profile of the individual lines.

The following link provides an explanation of how to interpret the profiling results.

https://www.mathworks.com/help/matlab/matlab_prog/profiling-for-improving-performance.html

There is also a cputime function if you really need that. I have never used it and it does not give a complete breakdown of all the functions.

https://www.mathworks.com/help/matlab/ref/cputime.html

Here is a detailed description of how to profile your code starting at the command window. You set the profile status to on, and run your program. Notice that there is a -timer 'cpu' option. Just be aware that cpu time gives you the sum of the times on all your CPU cores; so the cpu time can be larger than measuring time using timeit or tic/toc.

https://www.mathworks.com/help/matlab/ref/profile.html

[Benson Gou]

Hi, Paul,

Thanks a lot for your answer.

I run my code in the Commend Window because my code requires the input file names. I just tried, but could not run my code.

Thanks a lot.

Benson

[Walter Roberson]

You can use the profile command; see https://www.mathworks.com/help/matlab/ref/profile.html

[Paul Hoffrichter]

Looks like while I was updating my answer, and checking the profile command, @Walter Roberson came up with the same link that you can use from the command window.

[Paul Hoffrichter]

In other IDE's, there is a place to enter arguments to the command line which are used when hitting their Run button. Closest I found in MATLAB is this RUN approach which allows hitting the RUN button with arguments. I just tested to see whether the Run and Time button will pick up the arguments set in the Run button. It does pick up the arguments, so perhaps you can enter your arguments in the Run button, and get the Profile results easily.

https://www.mathworks.com/help/matlab/matlab_prog/configure-run-button.html