10 Linux Performance Monitoring and Debugging Tools

Similar to the previous post, this short post provides 10 monitoring and debugging tools that will be helpful when you are working on a Linux environment.

Sar	#Report I/O statistics every 1 second for a total of 3 times sar –b 1 3
Tcpdump	# Displays captured packages in ASCII tcpdump –A –i eth0
Iostat	#Displays information about the CPU usage and I/O statistics about all the partitions of the system iostat
Mpstat	#Report processor statistics mpstat -A
Vmstat	#Display the memory usage (including swap) vmstat
PS	#Display processes that belong to the specified usernames ps –f –u wwwrun, postfix #Display the process id and commands in a hierarchy. ps –e –o pid,args --forest
Free	#Display the total physical memory on this system in KB free #Display total in MB displaying the sum of physical and swap memory values, excluding the buffer/cache line. free –mto
TOP	# Displays a specific user process only top –u geek While unix top command is running, press u which will ask for username.
Pmap	#Displays memory of the given process id pmap 5732 #Display additional information about the memory maps pmap –x 5732 #Display the device information of the process maps pmap –d pid