leak.rb

i = 0

def parse_param(s)
  unless block_given?
    return enum_for(__method__, s)
  end
  yield "a"
  nil
end

def parse_line(line)
  parts = parse_param(';' + line)
  parts.next
end


while i < 10_000
  Thread.new { parse_line("Content-Type:application/json; charset=ISO-8859-1") }.join
  slots = GC.stat[:heap_live_slots]
  _,rss = `ps ax -o pid,rss | grep -E "^[[:space:]]*#{$$}"`.strip.split.map(&:to_i)
  puts "slots #{slots} #{i+=1} threads #{Thread.list.count} rss #{rss}"
end

puts "done #{RUBY_VERSION}"
gets


##
#  Ruby 2.3.3
#  slots 19183, rss 36980

#  Ruby 2.4.1
#  slots 14448, rss 132572
#
#  Ruby latest
#  slots 13783 rss 257108