Thank you very much for your great explanation.
I little bit doubt that why +/- buffers/cache is not tallying for machine1.
I understood after displaying it as mb.Here is output in mb which is not
tallied.
[root@machine1 ~]# free -m
total used free shared buffers cached
Mem: 32183 1309 30873 0 290 485
-/+ buffers/cache: 533 31649
Swap: 51199 0 51199
Thanks again,
Ashik
On Tue, Dec 18, 2012 at 9:35 AM, John R Pierce <pierce@xxxxxxxxxxxx> wrote:
> On 12/17/2012 10:22 PM, AshikAli.m wrote:
> > I have two 64 bit cent Os machine. I googled that in linux always show
> > entire memory as used. But below showing only 1 GB detected.
>
> no, that first one shows you have 31gb ram, about 1gb is being used by
> software, and the other 30GB are in use as buffers/cache
>
> the second shows 11gb ram, 1gb used, and 10gb as buffers/cache
>
> here's a machine fo mine thats been running for a couple months with
> large databases (both postgres and oracle)
>
> # free -g
> total used free shared buffers cached
> Mem: 47 43 3 0 0 38
> -/+ buffers/cache: 5 42
> Swap: 49 0 49
>
> out of 47gb total, 5gb is actually used, 38gb is in use as disk cache,
> and 3gb is completely unused currently, so 42gb is available for use by
> software.
>
> the main line to look at is the -/+ buffers/cache. THAT is the real
> usage with discardable buffers and cache subtracted and the 'free' value
> on that line is the buffers + cache + freespace
>
>
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