sudo /etc/init.d/postgresql stop
 * Stopping PostgreSQL 9.3 database server
n@vps:~$

top
 PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
23644 root      20   0       0      0      0 S   3.3  0.0   0:04.02 kworker/3:1
23846 root      20   0       0      0      0 S   2.0  0.0   0:00.12 kworker/1:1
   74 root      20   0       0      0      0 S   0.7  0.0   9:07.00 kswapd0
16266 root      20   0 1409552  20320    984 S   0.7  2.0  16:08.21 .ruby.bin
18514 daemon    20   0  381484  72432    256 D   0.7  7.1   2:29.87 .ruby.bin
17729 postgres  20   0  177516   2616   1960 S   0.3  0.3   0:35.87 postgres.bin