[Voyage-linux] will my application fit?

[Sam]

Jeff Ramin wrote:
> Hi folks.
> 
> I'm trying to determine if an Alix board, running voyage, has enough 
> memory to run an application. I've got it running on the board, but I'm 
> having a hard time determining how much memory is unused.
> 
> My usual tool (the free command) show me how much ram is unused, but 
> some of that memory is being used by tmpfs file systems (such as 
> /lib/init/rw), as well as for file caching. From what I've read, that 
> memory could be used for applications, if needed.
> 
> Is there some command that indicates how much memory is potentially 
> available to a running application?
> 
> Thanks!
> 

Yes the buffers line from free -m shows the amount of memory used.

voyage:~# free -m
              total       used       free     shared    buffers     cached
Mem:           123        116          7          0          0         43
-/+ buffers/cache:         72         51
Swap:            0          0          0
voyage:~#

Shown here on the -/+ buffers line, I am using 72mb of memory.  The rest 
is cache.

This value come from cat /proc/meminfo

-/+ buffers= (MemTotal - MemFree) - (Buffers + Cached)

/lib/init/rw is mainly being used to store logs from /var/logs.  You 
could try configuring the stuff in /etc/logrotate.d/ so that you don't 
keep many old log files.  Default tmpfs size can be set in 
/etc/defaults/tmpfs (I think).  tmpfs doesn't allocate the whole size at 
once though, A tmpfs size of 60mb with only one 4kb file in it will only 
take up 4kb of ram.

Sam