run these commands, post output.
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PHP Code:
:~# free -m
total used free shared buffers cached
Mem: 15745 1516 14229 32 31 402
-/+ buffers/cache: 1081 14663
Swap: 90 0 90
:~# uname -a
Linux spartaclan 3.13.0-96-generic #143-Ubuntu SMP Mon Aug 29 20:15:20 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Why do you have 90mb swap?
how much should be ? i decreased processings , server didnt freeze anymore
I'd advise between 8 and 32gb swap
If you really run out of RAM, maybe just consider a better setup, since swap is slow as fuck
Or ye, kill unused "processings"
i decreased processing , my problem fixed. thx for you answers