test_mem.rb

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"