memory profiling script

script/test_mem.rb

@@ -0,0 +1,30 @@
+start = Time.now
+require 'objspace'
+require File.expand_path("../../config/environment", __FILE__)
+
+# preload stuff
+I18n.t(:posts)
+
+# load up all models and schema
+(ActiveRecord::Base.connection.tables - %w[schema_migrations]).each do |table|
+table.classify.constantize.first rescue nil
+end
+
+# router warm up
+Rails.application.routes.recognize_path('abc') rescue nil
+
+puts "Ruby version #{RUBY_VERSION} p#{RUBY_PATCHLEVEL}"
+
+puts "Bootup time: #{Time.now - start} secs"
+
+GC.start
+
+puts "RSS: #{`ps -o rss -p #{$$}`.chomp.split("\n").last.to_i} KB"
+
+s = ObjectSpace.each_object(String).map do |o|
+  ObjectSpace.memsize_of(o) + 40 # rvalue size on x64
+end
+
+puts "Total strings: #{s.count} space used: #{s.sum} bytes"
+
+