how to check CPU performance in linux

name
top - display linux tasks

synopsis
top -hv | -bchiss -d delay -n iterations -p pid [, pid ...]

the traditional switches â-â and whitespace are optional.

description
the top program provides a dynamic real-time view of a running sys-
tem. it can display system summary information as well as a list of
tasks currently being managed by the linux kernel. the types of
system summary information shown and the types, order and size of
information displayed for tasks are all user configurable and that
configuration can be made persistent across restarts.

the program provides a limited interactive interface for process
manipulation as well as a much more extensive interface for personal
configuration -- encompassing every aspect of its operation. and
while top is referred to throughout this document, you are free to
name the program anything you wish. that new name

you the top command

running the top command will display processes ranked by CPU usage

top gives you a dynamic real time report of current running services on your system. it can show system summary infromation and a list of tasks currently being managed by the kernel. use the R option to rost the porcess by cpu like this

#top -R