parse_test.rb

require 'thin'
request = "GET / HTTP/1.0\r\nHost: 127.0.0.1:3001\r\nUser-Agent: ApacheBench/2.3\r\nAccept: */*\r\n\r\n"

def rss
  system "ps -orss= #{$$}"
end

rss

while true
  100_000.times do
    parser = Thin::HttpParser.new
    parser.execute({}, request, 0)
  end
  rss
end

leaks on rbx 1.0.1 20100603
not on 1.8 or ruby-head (although the latter sees interesting growth initially)