Object Profiler for ruby 2.1.0+

object_profiler.rb

module ObjectSpace
  def self.profile(&blk)
    require 'objspace'

    enable_gc = GC.disable
    ObjectSpace.trace_object_allocations(&blk)
    objs = Hash.new(0)
    ObjectSpace.each_object { |o|
      if (file = ObjectSpace.allocation_sourcefile(o)) && (line = ObjectSpace.allocation_sourceline(o))
        objs["#{file}:#{line}:#{o.class.name}"] += 1
      end
    }
    ObjectSpace.trace_object_allocations_clear
    GC.enable if enable_gc
    objs
  end
end

# require 'pp'
# objs = ObjectSpace.profile do
#   a_new_array = ["a new string"]
# end
# 
# pp objs
#
# => {"object_profiler.rb:21:Array"=>1, "object_profiler.rb:21:String"=>1}