Common commands for Linux and Unix system optimization

Dmesg displays kernel information, when a module loaded in the hardware or kernel has a problem, some useful information can be provided. top: display the actual CPU usage. sar is used to collect, report, and save system information. iostat is displayed after the system is started. average CPU time, disk Subsystem usage v...

 

Dmesg displays kernel information. some useful information can be provided when a module loaded in the hardware or kernel has a problem.

 

Top: displays the actual CPU usage

 

Sar is used to collect, report, and store system information.

 

Iostat displays the average CPU time and disk subsystem usage after the system is started.

 

Vmstat monitors process, memory, page I/O blocks, CPU, and other information

 

Mpstat monitors the status of each CPU in multiple CPU systems

 

Ulimit-a controls resource usage

 

Pmap displays the number of memory used by processes.

 

Lsof displays the files used by the process

 

Free-m display memory usage