top and pidstat command

$ top
Display the top processes in your Unix server continusly, until you cancel the command with Ctrl + c

$ top -n 5
Execute the top command 5 times .

$ top -d 10 -n 5
Execute the top command 5 times with 10 secons of delay between each run.

$ top -d 10 -n 5 -o %CPU
Execute the top command 5 times with 10 secons of delay between each run and sort the output by %CPU column.

$ top -d 10 -n 5 -b -o %CPU
If you want to re-direct the output from your top command to a log file or another command, you must use the -b option (Which means Batch Mode).

********************************************************************************

$ pidstat
Or
$ pidstat -p ALL
Display a list of all processes running at that time and the resource that they are using. This command will list all the process from the server, so it could be a long list.

$ pidstat 5 10
Display only process, which are using some resources are that moment. (Not all processes).
The two numbers passed to the command will make it to run 5 times with a delay of 10 seconds between each run.
* This report is much better as it shows only process whose use of resources changes between the time interval you have specified.

$ pidstat 5 10 -u -r
Display information about CPU and Memory Usages.

• -d Report I/O statistics.
• -r Report page faults and memory utilization.
• -u Report CPU utilization

$ pidstat -C mySql
Display the resource usage for a specific process

$pidstat -p 1234
Display the resource usage for a specific process Id (PID).