@julian thanks, but all properties on any VPS "permission denied on key":

$ cat /proc/sys/vm/swappiness 60 $ sudo sysctl vm.swappiness=10 sysctl: permission denied on key 'vm.swappiness'

And with the memory seems to be all right:
0_1478632336050_Снимок экрана от 2016-11-08 22-12-04.png