[CentOS] What free memory range is safe to operate?

[Steven Tardy]

> On Oct 27, 2017, at 11:39 AM, marcos valentine <msr.mailing at gmail.com> wrote:
> 
> percent of free memory is indicated to operate?

Free memory as in unused or free memory as in available (unused + disk buffers)?

Google: Linux ate my RAM

Output of `free` from your system may provide some context.

Now-a-days as long as swap is barely used (single digit percent) the system is usually healthy.

If the system “runs out of RAM” swap would fill up (`sar` gives historical data which often helps ID hangs or reboots due to apps running a system out of RAM) and OOM is seen in messages/dmesg.