ansible parallelism

00.yml

- name: Tests
  hosts: study_hosts
  gather_facts: false
  become: false
  tasks:
    - name: A
      ansible.builtin.command: sleep 1
      loop: "{{ [1, 2] }}"


# Runs:
# 1s: wait on host 1 && wait on host 2
# 2s: wait on host 1 && wait on host 2 

01.yml

- name: Tests
  hosts: study_hosts
  gather_facts: false
  become: false
  tasks:
    - name: A
      ansible.builtin.command: sleep 1
      loop: "{{ [inventory_hostname, inventory_hostname] }}"
# Runs:
# 1s: wait on host 1 && wait on host 2
# 2s: wait on host 1 && wait on host 2 

10.yml

- name: Tests
  hosts: study_hosts
  gather_facts: false
  become: false
  tasks:
    - name: A
      ansible.builtin.include_role:
        name: "test"
      loop: "{{ [1, 2] }}"
# Runs:
# 1s: wait on host 1 && wait on host 2
# 2s: wait on host 1 && wait on host 2 

11.yml

- name: Tests
  hosts: study_hosts
  gather_facts: false
  become: false
  tasks:
    - name: A
      ansible.builtin.include_role:
        name: "test"
      loop: "{{ [inventory_hostname, inventory_hostname] }}"

# Runs:
# 1s: wait on host 1
# 2s: wait on host 1
# 3s: wait on host 2
# 4s: wait on host 2

main.yml

- name: Wait
  ansible.builtin.command: sleep 1