$ sudo ps_mem 
Private  +   Shared  =  RAM used   Program 

156.0 KiB +  30.5 KiB = 186.5 KiB   agetty
216.0 KiB +  58.0 KiB = 274.0 KiB   atd
128.0 KiB + 162.0 KiB = 290.0 KiB   inet_gethost (2)
196.0 KiB + 120.5 KiB = 316.5 KiB   tee (2)
364.0 KiB +  72.0 KiB = 436.0 KiB   epmd
364.0 KiB + 125.5 KiB = 489.5 KiB   mysqld_safe
628.0 KiB +  97.0 KiB = 725.0 KiB   auditd
692.0 KiB + 103.0 KiB = 795.0 KiB   crond
800.0 KiB +  59.5 KiB = 859.5 KiB   systemd-logind
376.0 KiB + 537.0 KiB = 913.0 KiB   avahi-daemon (2)
712.0 KiB + 363.0 KiB =   1.0 MiB   login
  1.0 MiB + 101.0 KiB =   1.1 MiB   ovsdb-client
  1.0 MiB + 123.5 KiB =   1.1 MiB   dbus-daemon
656.0 KiB + 697.5 KiB =   1.3 MiB   ovsdb-server
472.0 KiB +   1.0 MiB =   1.5 MiB   monitor (2)
  1.5 MiB + 167.5 KiB =   1.7 MiB   systemd-udevd
  1.3 MiB + 808.0 KiB =   2.1 MiB   sudo (2)
  3.3 MiB + 211.0 KiB =   3.5 MiB   lvmetad
  1.4 MiB +   2.6 MiB =   4.0 MiB   sshd (3)
  4.4 MiB +  48.5 KiB =   4.4 MiB   screen
  4.8 MiB +  87.0 KiB =   4.9 MiB   dstat
  4.1 MiB +   2.2 MiB =   6.3 MiB   systemd (3)
  4.0 MiB +   2.7 MiB =   6.6 MiB   (sd-pam) (2)
  5.8 MiB +   1.3 MiB =   7.1 MiB   NetworkManager
  6.7 MiB +   1.0 MiB =   7.7 MiB   polkitd
  7.1 MiB +   1.5 MiB =   8.6 MiB   bash (17)
  9.7 MiB + 241.0 KiB =   9.9 MiB   neutron-rootwra
 14.0 MiB + 275.5 KiB =  14.3 MiB   dhclient
 17.7 MiB +   1.1 MiB =  18.8 MiB   firewalld
 15.5 MiB +   3.9 MiB =  19.4 MiB   libvirtd
 11.1 MiB +   8.9 MiB =  20.1 MiB   systemd-journald
 26.4 MiB + 501.0 KiB =  26.9 MiB   neutron-ns-meta
 49.1 MiB + 256.0 KiB =  49.3 MiB   beam.smp
 54.5 MiB +   3.1 MiB =  57.7 MiB   nova-compute
 69.1 MiB + 990.5 KiB =  70.1 MiB   nova-cert
 71.4 MiB + 990.0 KiB =  72.4 MiB   nova-scheduler
 76.7 MiB + 820.0 KiB =  77.5 MiB   ovs-vswitchd
 90.4 MiB +   2.6 MiB =  93.0 MiB   qemu-system-x86_64
 64.1 MiB +  57.3 MiB = 121.3 MiB   glance-api (5)
116.6 MiB +  59.6 MiB = 176.2 MiB   glance-registry (9)
180.6 MiB + 385.0 KiB = 181.0 MiB   mysqld
373.2 MiB + 108.1 MiB = 481.3 MiB   nova-api (13)
407.5 MiB +  78.5 MiB = 486.0 MiB   python2.7 (22)
571.3 MiB +  17.2 MiB = 588.5 MiB   nova-conductor (9)
---------------------------------
                          2.6 GiB
=================================