palkan · January 24, 2022 13:29 · Jan 24, 2022
diff --git a/README.md b/README.md
@@ -0,0 +1,41 @@
+Add the following to `application.rb`:
+
+```ruby
+$icallbacks = []
+$icallbacks.define_singleton_method(:print) do
+  puts sort_by { |(a, b)| -b }.map { |(a, b)| "#{b}\t\t#{a}" }.join("\n")
+end
+
+ActiveSupport::Notifications.subscribe("load_config_initializer.railties") do |event|
+  $icallbacks << [event.payload[:initializer], event.duration]
+end
+
+$pcallbacks = []
+$pcallbacks.define_singleton_method(:print) do
+  puts sort_by { |(a, b)| -b }.map { |(a, b)| "#{b}\t\t#{a.first}:#{a.last}" }.join("\n")
+end
+
+require 'active_support/reloader'
+require 'benchmark'
+
+ActiveSupport::Reloader.singleton_class.prepend(Module.new do
+  def to_prepare(*args, &block)
+    wrapper = proc do |*bargs|
+      result = nil
+      time = Benchmark.realtime do
+        result = block.call(*bargs)
+      end
+
+      $pcallbacks << [block.source_location, time]
+
+      result
+    end
+
+    super(*args, &wrapper)
+  end
+end)
+```
+
+Then, run `rails r 'puts $icallbacks.print'`, etc.
+
+See also [Bumbler](https://github.com/nevir/Bumbler).
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