I have a CentOS 7 server that is running out of memory and I can't
figure out why.
Running "free -h" gives me this:
total used free shared buff/cache
available
Mem: 3.4G 2.4G 123M 5.9M
928M 626M
Swap: 1.9G 294M 1.6G
The problem is that I can't find 2.4G of usage. If I look at resident
memory usage using "top", the top 5 processes are using a total of
390M. The next highest process is using 8M. For simplicity, if I
assume the other 168 processes are all using 8M (which is WAY too high),
that still only gives a total of 1.7G. The tmpfs filesystems are only
using 18M, so that shouldn't be an issue.
Yesterday, the available memory was down around 300M when I checked it.
After checking some things and stopping all of the major processes,
available memory was still low. I gave up and rebooted the machine,
which brought available memory back up to 2.8G with everything running.
How can I track what is using the memory when the usage doesn't show up
in top?
--
Bowie
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