CentOS - Oct 2017 - What free memory range is safe to operate?

Hello,

Hello, There's a official documentation telling which is the percent of
free memory is indicated to operate?A limit to Avoiding crashing, slow
performance, and memory warnings. What are the thresholds?



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> 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.