Finding how much memory a plugin uses?

My employer plugins complains that one of the small plug-ins caused memory leak server and it stops the machine.
I have an assumption that it because of tracing of OnRunCommand, especially when more than 100 people on the server and thus most of players uses commands

 

i believe the only way to fix it is by looking over the scripts and actually working out what one is using most memory it will be something building up a array for sure, using mysql is better practice as you dont need to keep it in memory