SAR command help

akki

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I need to find total RAM size of system by sar command, is there any possibility to achieve this?
 


G'day akki, and Welcome to Linux.org

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2, Monitoring memory details (sar -r)
The switch “-r” will help you to analyse memory usage by using sar command. The command usages are similar to previous. Different usages are listed below:

sar -r (Lists the details from the staring of this day)

With an interval

sar -r 1 2 (Lists memory usage details two times with an interval of on second)

From the file

sar -r -f /var/log/sa/sa23 (Fetch memory usage details of previous dates. Those files are located under “/var/log/sa/”).

Example

[root@vps ~]# sar -r 1 2
Linux 2.6.32-042stab088.4 (vps.crybit.com) 03/19/15 _x86_64_ (8 CPU)

16:45:59 kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit
16:46:00 109548 414740 79.11 0 300664 0 0.00
16:46:01 109544 414744 79.11 0 300664 0 0.00
Average: 109546 414742 79.11 0 300664 0 0.00

Field descriptions
>> kbmemfree : Amount of free memory available in kilobytes.
>> kbmemused : Amount of used memory in kilobytes. This does not take into account memory used by the kernel itself.
>> %memused : Percentage of used memory.
>> kbbuffers : Amount of memory used as buffers by the kernel in kilobytes.
>> kbcached : Amount of memory used to cache data by the kernel in kilobytes.
>> kbcommit : Amount of memory in kilobytes needed for current workload. This is an estimate of how much RAM/swap is needed to guarantee that there never is out of memory.
>> %commit : Percentage of memory needed for current workload in relation to the total amount of memory (RAM+swap). This number may be greater than 100% because the kernel usually overcommits memory.

Any help ??
 

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