@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_Π‘Π½ΠΈΠΌΠΎΠΊ ΡΠΊΡΠ°Π½Π° ΠΎΡ 2016-11-08 22-12-04.png