discourse/config/initializers/300-perf.rb

# frozen_string_literal: true

if Rails.env == "production"
  # This event happens quite a lot and fans out to ExplainSubscriber
  # and Logger, this cuts out 2 method calls that every time we run SQL
  #
  # In production we do not care about Explain or Logging SQL statements
  # at this level
  #
  # Micro bench shows for `User.first` this takes us from 3.3k/s to 3.5k/s
  ActiveSupport::Notifications.notifier.unsubscribe("sql.active_record")
end
PERF: remove SQL notifiers for every SQL execution Benchmarking: ``` Benchmark.ips do \|b\| b.report("simple") do User.first end end ActiveSupport::Notifications.notifier.listeners_for("sql.active_record").clear Benchmark.ips do \|b\| b.report("simple") do User.first end end ``` ``` sam@arch discourse % RAILS_ENV=production ruby script/micro_bench.rb Before Calculating ------------------------------------- simple 3.289k (± 4.4%) i/s - 16.575k in 5.049771s After Calculating ------------------------------------- simple 3.491k (± 3.6%) i/s - 17.442k in 5.002226s ```` 2019-05-09 15:44:06 +08:00			`# frozen_string_literal: true`

			`if Rails.env == "production"`
			`# This event happens quite a lot and fans out to ExplainSubscriber`
			`# and Logger, this cuts out 2 method calls that every time we run SQL`
			`#`
			`# In production we do not care about Explain or Logging SQL statements`
			`# at this level`
			`#`
			# Micro bench shows for `User.first` this takes us from 3.3k/s to 3.5k/s
			`ActiveSupport::Notifications.notifier.unsubscribe("sql.active_record")`
			`end`