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