Inefficient loops negatively impacts performance

[pemsith]

Describe the bug
The playbook uses an inefficient loop with the command module to remove container images individually. Each iteration of the loop invokes the command module, leading to unnecessary overhead and longer execution times, particularly when managing multiple container images.

Example of the inefficient task in infrastructure-playbooks/purge-dashboard.yml

• name: remove ceph dashboard container images
  command: "{{ container_binary }} rmi {{ item }}"
  loop:
  • "{{ alertmanager_container_image }}"
  • "{{ prometheus_container_image }}"
  • "{{ grafana_container_image }}"

Expected behavior
The task should handle the removal of container images in a more efficient way by combining the commands or using a more appropriate module or approach to process multiple images in a single execution.

Potential Optimization

Combine Commands: Remove all images in a single invocation:

• name: remove ceph dashboard container images (optimized)
  shell: "{{ container_binary }} rmi {{ alertmanager_container_image }} {{ prometheus_container_image }} {{ grafana_container_image }}"
  Use a Script: Create a small script to process the list of images and execute it in one task:

• name: remove ceph dashboard container images using a script
  shell: |
  {% for image in [alertmanager_container_image, prometheus_container_image, grafana_container_image] %}
  {{ container_binary }} rmi {{ image }}
  {% endfor %}
  Observation
  This inefficient loop may cause noticeable delays in environments with a larger number of images. Optimizing the task by reducing the number of command invocations will significantly improve performance and reduce execution time.

Recommendation

Refactor the task to minimize the number of invocations of the command module.
Consider combining commands or using a custom script to process the images in bulk.
Optimizing this task will enhance the efficiency and scalability of the playbook, especially in scenarios with a higher number of container images to manage.

Environment:

• OS - CentOS stream 9
• Ansible version (e.g. ansible-playbook --version):
  ansible [core 2.15.8]
  config file = None
  configured module search path = ['/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /.local/lib/python3.9/site-packages/ansible
  ansible collection location = /.ansible/collections:/usr/share/ansible/collections
  executable location = /.local/bin/ansible
  python version = 3.9.18 (main, Jan 4 2024, 00:00:00) [GCC 11.4.1 20231218 (Red Hat 11.4.1-3)] (/usr/bin/python3)
  jinja version = 3.1.3
  libyaml = True

[guits]

hello @pemsith
thanks for your feedback. Would you mind sending a PR ? 😁

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