Skip to content

Belajar menganalisa “free” comand di linux

The linux free command allows us to check free/used memory on
the system The output below is the result of running.

Output explained
The first line starting with Mem: gives us the following information:

 * total - is the total avaialble RAM
   (== Physical Memory) after subtracting the amount used by the kernel! 
   In my case I have 1GB RAM.
 * used - is the part of the RAM that currently has information in it 
   that can be of use to the system (remember: unused RAM is useless, 
   try to maximise this value)
 * free - is just total-used
 * shared - is the amount of memory shared between processes
 * buffers and cached - the cached data and buffers for IO 

The second line starting with -/+ buffers/cache: tells us how much of 
the memory in the buffers/cache is used by the applications and how 
much is free.Keep in mind that in general the cache is filled with
disk IO cached data. The cache can be very easily reclaimed by the 
OS for applications.Let BUFFERS + CACHED from first line be value X.
X subtracted from the USED memory from the first line gives how much 
RAM is used by applications (USED value on second line) X added to 
the FREE memory on the first line gives how much RAM applications 
can still request from the OS. While the first line handles the 
values of currently used RAM, including applications and caches 
(but excluding kernel),the second line gives info on application 
related memory:how much is currently in use and how much is there 
still available for the applications.

taken from : http://salomie.ro/wiki/index.php/Linux_Free_Command
No comments yet

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: