I am using this to profile my workers (queue_classic)

memstat.rb

module Memstat
  extend self
  
  MAC = RUBY_PLATFORM =~ /darwin/

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

  def real_mem_size
    mb = (MAC ? `ps -o rss -p #{$$}` : `ps -o rsz #{$$}`).split("\n")[1].to_f / 1024.0
    mb = mb.round(1)
    "#{mb}MB"
  end

  def num_objects
    ObjectSpace.count_objects[:TOTAL]
  end
end