Toolset for quick and dirty bottleneck approach

Toolset for quick and dirty bottleneck approach:

CPU bottleneck:
mpstat -P all  (or press “1″ inside top)

• question: are you effectively using all your CPUs or is a subset doing most of the work?
• followup: can you parallelize the processes to utilize more CPU?

Disk I/O bottleneck:
iostat -x -m 2

• question: are any of your block devices saturated? what is the read/write I/O profile?
• followup: tune database queries, increase # of spindles and/or drive speed, add RAM to push more data into the Innodb Buffer Pool, etc

Network bottleneck:
pktstat -t

• question: what is your % utilization per interface?
• followup: find someone who knows more about the network than me