If you want to view what is currently running on your Linux server you can call the following command;
This lets you see every process that is running and see at a glance what is roughly consuming the most resources on your machine.
There are better tools for digging into this information but
top will give you a good quick overview.
top is running type
q to quit it.
If you want to read up more on
top you can read the man page by typing
man top in your terminal.