Analyzing Operaing System Performance

top 
prstat 5
mpstat 
vmstat
free -m

This command displays the top ten CPU consuming resources on the server.

ps -e -o pcpu,pid,user,tty,args | sort -n -k 1 -r | head

TThis command displays the top ten MEMORY consuming resources on the server.

ps -e -o pmem,pid,user,tty,args | sort -n -k 1 -r | head

Determing I/O Bottlenecks

iostat -xd 10
iostat -d 3
iostat 2 3

Detecting Network - Intensive Processes 

netstat -ptc

ping <hostname> or <ipaddress>
telent <hostname> <portnumber>