Appendix :
Here is a list of various Linux monitoring tools and statistics files:
Overall Tools:
top, vmstat, sar, ps, pstree, ipcs
CPU:
top, mpstat, tload, /proc/cpuinfo, x86info
Memory:
free, /proc/meminfo, slabtop, /proc/slabinfo, ipcs
I/O:
iostat, vmstat, sar
sar examples:
To display CPU utilization:
sar 3 100
To display paging activity:
sar -B 3 100
To display swapping activity:
sar -W 3 100
To display block I/O activity:
sar -b 3 100
To display block I/O activity for each block device:
sar -d 3 100
To display network activity:
sar -n DEV 3 100