Number of running instances = 18

# Before using django.setup

$ free -h
              total        used        free      shared  buff/cache   available
Mem:           1.2G        1.1G         15M         38M        100M         22M

# Restart gunicorn with no changes (just to be sure)

              total        used        free      shared  buff/cache   available
Mem:           1.2G        1.1G         11M         27M        121M         50M


# After
$ free -h
              total        used        free      shared  buff/cache   available
Mem:           1.2G        462M        175M         87M        608M        642M

# Restart just to be sure

              total        used        free      shared  buff/cache   available
Mem:           1.2G        359M        783M        9.5M        104M        823M

# After stopping gunicorn altogether
$ free -h
              total        used        free      shared  buff/cache   available
Mem:           1.2G        250M        860M         25M        135M        917M