> The information there looks about correct. I get different output from
> `free`, however:
>             total       used       free     shared    buffers     cached
> Mem:       3843684    3622932     220752          0      85184    995880
> -/+ buffers/cache:    2541868    1301816
> Swap:      6289412    1258920    5030492
>
> Here, the second line without buffers and cache is interesting.
>
> When using `top`, look at the RES column and for some applications that
> make usage of shared memory, the SHR column. The link you provided
> completely ignores that but in some cases, this usage can be significant.
>
>
> Hope this helps,
> Florian Philipp

One thing I'd like to add to Florian's comment ... If you have not yet 
tried it, install a copy of 'htop' from Dag Wieers' SourceForge 
repository.  There is an el6 version of the repo configuration rpm 
available at:  packages.sw.be/rpmforge-release/

'htop' is an excellent tool for poking around processes, and allows you 
to scroll vertically *and* horizontally through the process list.  I 
much prefer it to traditional 'top'.

Chuck