ps_mem.py debian raspberry

root@dns:/home/pi # apt-get install gcc python-dev python-pip
root@dns:/home/pi # pip install ps_mem
Collecting ps_mem
  Downloading ps_mem-3.6.tar.gz
Building wheels for collected packages: ps-mem
  Running setup.py bdist_wheel for ps-mem ... done
  Stored in directory: /root/.cache/pip/wheels/62/da/b7/06050fabac6563945185c173835cd76dd2ccc273172eb3f5f7
Successfully built ps-mem
Installing collected packages: ps-mem
Successfully installed ps-mem-3.6

root@dns:/home/pi # wget https://raw.githubusercontent.com/pixelb/ps_mem/master/ps_mem.py
--2017-11-26 18:43:35--  https://raw.githubusercontent.com/pixelb/ps_mem/master/ps_mem.py
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 151.101.0.133, 151.101.64.133, 151.101.128.133, ...
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|151.101.0.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 22127 (22K) [text/plain]
Saving to: ‘ps_mem.py’
ps_mem.py    100%[============================================================================>]  21.61K  --.-KB/s    in 0.03s
2017-11-26 18:43:36 (818 KB/s) - ‘ps_mem.py’ saved [22127/22127]

root@dns:/home/pi # chmod 777 ps_mem.py

root@dns:/home/pi # ./ps_mem.py
 Private  +   Shared  =  RAM used       Program
316.0 KiB +  53.0 KiB = 369.0 KiB       sftp-server
276.0 KiB + 144.5 KiB = 420.5 KiB       cron
272.0 KiB + 204.5 KiB = 476.5 KiB       thd
392.0 KiB + 216.0 KiB = 608.0 KiB       agetty (2)
504.0 KiB + 395.0 KiB = 899.0 KiB       systemd-timesyncd
584.0 KiB + 478.0 KiB =   1.0 MiB       systemd-logind
740.0 KiB + 347.0 KiB =   1.1 MiB       dbus-daemon
304.0 KiB + 851.0 KiB =   1.1 MiB       avahi-daemon (2)
744.0 KiB + 509.0 KiB =   1.2 MiB       su (2)
800.0 KiB + 478.5 KiB =   1.2 MiB       (sd-pam)
  1.3 MiB + 154.5 KiB =   1.4 MiB       systemd-udevd
  1.3 MiB +  96.5 KiB =   1.4 MiB       rsyslogd
748.0 KiB + 864.0 KiB =   1.6 MiB       sudo (2)
  1.2 MiB + 430.0 KiB =   1.6 MiB       systemd-journald
  1.5 MiB +   2.2 MiB =   3.7 MiB       systemd (2)
  1.7 MiB +   5.5 MiB =   7.2 MiB       sshd (7)
 16.4 MiB +   1.4 MiB =  17.8 MiB       bash (4)
 11.7 MiB +   9.2 MiB =  20.9 MiB       apache2 (10)
 27.6 MiB + 986.5 KiB =  28.5 MiB       unbound
---------------------------------
                         92.6 MiB
=================================
Warning: Swap is not reported by this system.