Man Top Linux. Htop command to find memory load of each process. Keep sorted column highlighting off so as to minimize path length.
From the top man page. The linux man pages project. Best linux distributions for older computers.
Its really handy to understand what is going on.
See overview linux memory types for additional details. Ps and top display cpu time used not clock time since the process started. A quick guide to the top command used to list the processes running in real time. The linux top command is one of the stalwarts of unix like operating systems.