Attempt at demonstrating the memory leak in ruby-grape#2102 with remo…

…unting.

Gemfile

@@ -17,6 +17,7 @@ end
 group :development do
  gem 'appraisal'
  gem 'benchmark-ips'
+ gem 'benchmark-memory'
  gem 'guard'
  gem 'guard-rspec'
  gem 'guard-rubocop'

benchmark/remounting.rb

@@ -0,0 +1,53 @@
+$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
+require 'grape'
+require 'benchmark/memory'
+
+class VotingApi < Grape::API
+ logger Logger.new(STDOUT)
+
+ helpers do
+ def logger
+ VotingApi.logger
+ end
+ end
+
+ namespace 'votes' do
+ get do
+ logger
+ end
+ end
+end
+
+class PostApi < Grape::API
+ mount VotingApi
+end
+
+class CommentAPI < Grape::API
+ mount VotingApi
+end
+
+env = Rack::MockRequest.env_for('/votes', method: 'GET')
+
+PostApi.call(env)
+CommentAPI.call(env)
+
+calls = 1000
+
+Benchmark.memory do |api|
+ api.report('remounting first') do
+ calls.times { PostApi.call(env) }
+ end
+
+ api.report('remounting second') do
+ calls.times { CommentAPI.call(env) }
+ end
+
+ api.report('remounting both') do
+ calls.times do
+ PostApi.call(env)
+ CommentAPI.call(env)
+ end
+ end
+
+ api.compare!
+end