gistfile1.txt

unless File.exists?("rake-0.8.7.gem")
  puts 'downloading rake gem...'
  require 'open-uri'
  File.open('rake-0.8.7.gem','w'){|f| f.write open("http://production.cf.rubygems.org/gems/rake-0.8.7.gem").read }
end

require 'zlib'
require 'rubygems/format'

class Zlib::GzipReader
  class << self
    alias new_orig new
    def new(*args)
      GC.stress=true
      new_orig(*args)
    ensure
      GC.stress=false
    end
  end
end

def parse_gem
  Gem::Format.from_file_by_path('rake-0.8.7.gem')
end
1000.times do |i|
  p [Time.now, i+1]
  parse_gem
end