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@hogranch.com 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
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
* *