After a fresh install of a debian VPS, my system shows very low memory being used. I am not sure if this is even a issue. But according to 'free -m' My system is using only 21MB of RAM
total used free shared buffers cached Mem: 512 510 1 0 0 488 -/+ buffers/cache: 21 490 Swap: 512 435 76
This is a small debian 7 VPS with 512MB RAM running postgresql/php/lighttpd
I am concerned because resource intensive queries are running in the background when the output shows only 21MB ram being used.
Even when postgresql is shutdown, free -m still shows the same. Infact the output of free -m hasn't changed much ever since the fresh install of the VPS took place.
Right now I am running lighttpd / postgresql / sphinxsearch / php etc.
So is such low RAM usage normal ?
If not what could be the possible reasons for this ?
Edit: I am talking about low RAM usage, and not high RAM usage as pointed in linux ate my RAM.