Example 3

hosts.yml

centos:
  hosts:
    provisioner:
      ansible_connection: local
    centos1:
      ansible_host: '192.168.77.22'
ubuntu:
  hosts:
    ubuntu1:
      ansible_host: '192.168.77.23'

playbook.yml

- hosts: all
  gather_facts: false
  tasks:
    - name: 1st sleep
      command: sleep 20
      when: inventory_hostname == 'provisioner'
      async: 45
      poll: 0
    - name: 2nd sleep
      command: sleep 5
      when: inventory_hostname == 'centos1'
      async: 10
      poll: 0
    - name: 3rd sleep
      command: sleep 5
      when: inventory_hostname == 'ubuntu1'
      async: 10
      poll: 0
    - name: 4th sleep
      command: sleep 5
      when: inventory_hostname == 'provisioner'
      async: 10
      poll: 0
    - name: 5th sleep
      command: sleep 5
      when: inventory_hostname == 'centos1'
      async: 10
      poll: 0

Tip

The user can introduce the fire & forget behavior using async and poll directives.

Execute the following command

time ansible-playbook playbook.yml

Do you expect to see improved results compared to Example 1?

Yes, because Ansible will exit before the tasks are actually finished running.