Am not sure, but could this be helpful

http://stackoverflow.com/questions/37644275/cpu-utilization-in-sdn-pox-controller 

Thank you very much ..  Dr. Yasir 

hello

By typing "htop" in mininet

 Thank you @Ghasabi Mozhgan  , i will do some search about htop , by the way I  need to check the CPU usage for SDN controller so why i run htop in mininet ?

you must creat topology and run controller in mininet

after

in terminal mininet typing htop and press enter

Thank you very much  @Ghasabi Mozhgan

see my paper:

Article A new method for layer 2 loop prevention in software defined networks

Thank you so much for sharing this, Can you explain how you captured the relationship between the time and the percentage of CPU usage Esmaeil Amiri