method_leak.rb

# frozen_string_literal: true

require 'securerandom'
require 'objspace'

module Giant
end

def rss
  `ps -p #{Process.pid} -o rss -h`.strip.to_i
end

def objspace_memsize
  size = 0
  ObjectSpace.each_object do |o|
    size += ObjectSpace.memsize_of(o)
  end
  size
end

1_000.times do
  bloated_method = <<~METHOD
    def _#{SecureRandom.hex}
      #{(0..1000).map { "sleep; " }.join}
    end
  METHOD

  Giant.module_eval bloated_method
end


3.times do
  GC.start
end

puts "RSS is: #{rss}, Object Space size is: #{objspace_memsize / 1024}"
# RSS is: 116852, Object Space size is: 2280