||||Vinyas

Check Server Info:

1) Server disk space in Gigabyte: root@server [~]# df -h

2) Total memory in MB: root@server [~]# free -t -m     -or-   cat /proc/meminfo

3) Distribution Info: uname -r    -or-   cat /etc/redhat-release

4)  CPU:  cat /proc/cpuinfo

Read More —

Linux comes with different command to check memory usage. free command displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel.

vmstat command reports information about processes, memory, paging, block IO, traps, and cpu activity.

Then you can use top command which provides a dynamic real-time view of a running system. It can display system summary information as well as a list of tasks currently being managed by the Linux kernel.

free command

Display free memory size in MB:

$ free -m

Output:

             total       used       free     shared    buffers     cached
Mem:           750        625        125          0         35        335
-/+ buffers/cache:        254        496
Swap:          956          0        956

Displays a line containing the totals memory in MB:
$ free -t -m
Output:

       total       used       free     shared    buffers     cached
Mem:           750        625        125          0         35        335
-/+ buffers/cache:        253        496
Swap:          956          0        956
Total:        1707        625       1082

vmstat command

Type vmstat command at shell prompt:
$ vmstat

Output:

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
1  0      0 131620  35432 341496    0    0    42    82  737  1364 15  3 81  1

top command

Type top command at shell prompt:
$ top

To exit from top command type q key.

Read man page of free, vmstat, top command for complete information.

Courtesy: cyberciti.biz