Re: How much memory is really free?

[Xiangfei Jia <xjianz@xxxxxxxxx>]

> unused = free + buffers + cached
> 
> sorry for not turning on my brain in the first posting :-)
>
> Sven

I think you are right. I can just treat unused = free + buffers +
cached. BUT, there is another problem. Like for my machine, I have been
let the machine running for a long time. I used kinfocenter to have a
visual look of the memory useage: a huge portion of the total memory is
used by 'application data', and I think most of the memory used by
applicaiton data is just cached data because I don't have a lot
programs running. In this case, the unused memory is very small. So, is
there a user mode command or kernel function I can use to flush all the
un-necessary cached data in the memory. Below is the output of comnad
"free -m" on my system.

           
        total      
used       free    
shared    buffers     cached
Mem:          
993        983        
10          0        
66         78
-/+ buffers/cache:     839        154
Swap:        
4000     
534       3465

Regards!

Fei