How many total memory is allocated to my Linux box?

Subject: How many total memory is allocated to my Linux box?
Author: Linux
In response to: Linux Memory Management
Posted on: 09/12/2012 07:55:00 PM

That is A=595 (MB).

# free -m | grep 'Mem' | tr -s ' ' | cut -d ' ' -f 2

>
> On 09/12/2012 07:54:09 PM Linux wrote:

You can use free to find out all memory allocated to your Linux box and how many memory your applications can use.

# free -m total used free shared buffers cached Mem: 595 382 212 0 132 190 -/+ buffers/cache: 59 535 Swap: 0 0 0

To explain the output, let's consider the general case:
# free -m total used free shared buffers cached Mem: A B C 0 D E -/+ buffers/cache: F G Swap: 0 0 0

Here comes the facts:
A -- the total memory allocated to your Linux box.
D+E -- buffers/cached memory gracefully occupied by system in case there are availabe.
G(=C+D+E) -- free memory your apps can use.

F(=B-D-E or =A-G) -- used memory by your apps.

References:

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