How to check RAM size in CentOS/Redhat

You can use any one of the following command line to view the ram size under Red hat Enterprise Linux desktop or server based system:

1. /proc/meminfo file –
2. free command –
3. top command –
4. vmstat command –

Examples:

Open a command-line terminal and then type the following commands:

$ cat /proc/meminfo

Redhat Linux: free command

To display amount of free and used memory (including total in the system), enter:

Free -m sample output

$ free -m

Free -g sample output

$ free -g

Free -k sample output

$ free -k

Redhat Linux: top command

The top command can also display total and used memory:

$ top

Sample outputs:

Other commands

The vmstat command can display memory statistics including additional information about processes, paging, block IO, traps, and cpu activity. Type the following command:

$ vmstat
$ vmstat -s

Vmstat output

Vmstat -s output:- display memory statics