Monday, 25 August 2014

RAM Raiders - Where has my RAM gone ?

Looking at my Linux box ( I am running Red Hat Enterprise Linux Server release 6.4 ), I was wondering where my RAM had gone .....

This is what I have: -

free -m

             total       used       free     shared    buffers     cached
Mem:         16081       8876       7205          0        378       7036
-/+ buffers/cache:       1462      14619
Swap:         8015        153       7862



Don't worry, this site had the answer: -



<snip>
How do I see how much free ram I really have?

To see how much ram is free to use for your applications, run free -m and look at the row that says "-/+ buffers/cache" in the column that says "free". That is your answer in megabytes:
$ free -m
             total       used       free     shared    buffers     cached
Mem:          1504       1491         13          0         91        764
-/+ buffers/cache:        635        
869

Swap:         2047          6       2041
$

If you don't know how to read the numbers, you'll think the ram is 99% full when it's really just 42%.
</snip>

In other words, I have most of my 16 GB RAM available to me ( ~89% ) which is nice.

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