---
# Enable Memory Overcommit /etc/sysctl.conf vm.overcommit_memory=2
# https://www.postgresql.org/docs/12/kernel-resources.html#LINUX-MEMORY-OVERCOMMIT
# View with sysctl -a |grep overcommit
- name: Enable Memory Overcommit /etc/sysctl.conf vm.overcommit_memory=2
  sysctl:
    name: vm.overcommit_memory
    value: '2'
    reload: yes
    state: present

# PostgreSQL docs recommend tweaking vm.nr_hugepages by using some math like so
# head -1 /var/lib/postgresql/12/main/postmaster.pid
#   Gave me 14299 (this is the current process ID, can also us ps aux|grep postgres)
# pmap 14299 | awk '/rw-s/ && /zero/ {print $2}'
#   Substiture your process ID of course
#   This gave me 145608K on a fresh install of postgres
# grep ^Hugepagesize /proc/meminfo
#   This gave me 2048KB
# Now take 145608 / 2048 = 71.09
# Now set sysctl -w vm.nr_hugepages=71

# I however did not do this just yet.  Will wait once Postgres is actually used
# before tweaking this type of setting
# - NO, not yet name: Tweak vm.nr_hugepages according to some precalculated math
#   sysctl:
#     name: vm.nr_hugepages
#     value: 2048
#     reload: yes
#     state: present