ActionMailbox uses lots of RAM although not in use - how to remove?

dogweather · February 5, 2021, 7:07am

Is there a way to remove ActionMailbox from my Rails app? I’m getting out of memory errors with Rails 6, and derailer shows action_mailbox as the lead memory hog — even though my app doesn’t use it:

TOP: 116.9336 MiB
  rails/all: 62.0156 MiB
    action_mailbox/engine: 35.7305 MiB

sdubois · February 5, 2021, 7:32am

When using rails new --skip-action-mailbox it comments out the line require "action_mailbox/engine" in config/application.rb:

github.com

rails/rails/blob/291a3d2ef29a3842d1156ada7526f4ee60dd2b59/railties/lib/rails/generators/rails/app/templates/config/application.rb.tt#L14


require "rails/all"
<% else -%>
require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
<%= comment_if :skip_active_job %>require "active_job/railtie"
<%= comment_if :skip_active_record %>require "active_record/railtie"
<%= comment_if :skip_active_storage %>require "active_storage/engine"
require "action_controller/railtie"
<%= comment_if :skip_action_mailer %>require "action_mailer/railtie"
<%= comment_if :skip_action_mailbox %>require "action_mailbox/engine"
<%= comment_if :skip_action_text %>require "action_text/engine"
require "action_view/railtie"
<%= comment_if :skip_action_cable %>require "action_cable/engine"
<%= comment_if :skip_sprockets %>require "sprockets/railtie"
<%= comment_if :skip_test %>require "rails/test_unit/railtie"
<% end -%>
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

So I’d try replacing require "rails/all" with this:

require "active_record/railtie"
require "active_storage/engine"
require "action_controller/railtie"
require "action_view/railtie"
require "action_mailer/railtie"
require "active_job/railtie"
require "action_cable/engine"
# require "action_mailbox/engine"
require "action_text/engine"
require "rails/test_unit/railtie"
require "sprockets/railtie"

dogweather · February 5, 2021, 8:06am

Excellent - great idea.