vmstat is tool used to check current memory utilisation

status.

it reports memory statistics of process,virtual memory,

disk,trap,and CPU activity.

Basic synctax is

vmstat <options> interval count

option include

paging -p , cache -c ,.interrupt -i

if no option specified then it will show info. about

process , memory , paging , disk ,interrupts & cpu

interval- is time between 2 successive output. it will

show / produce next ouput after specified time.

count- indicate how much ouput you want to see.