I am using this to profile my workers (queue_classic)

memstat.rb

module Memstat
  extend self

  def puts
    "memory=#{real_mem_size} ruby_objects=#{num_objects}"
  end

  def real_mem_size
    mb = `ps -o rsz #{$$}`.split("\n")[1].to_f / 1024.0
    mb = mb.round(-2) # nearest 100 (i.e. 60.round(-2) == 100)
    "#{mb}MB"
  end

  def num_objects
    ObjectSpace.count_objects[:TOTAL]
  end

end