xml.rb

#!/usr/bin/env ruby

require 'benchmark'

Benchmark.bm do |x|
  x.report("200 000") do
    File.open("out.xml", "w+") do |f|
      f << <<-EOF
<?xml version="1.0" encoding="UTF-8"?>
<feed xml:lang="en-US" xmlns:app="http://www.w3.org/2007/app" xmlns="http://www.w3.org/2005/Atom">
<id>tag:www.shop.ru,2005:/yamarket</id>
<title>Yandex market</title>
<updated>2009-09-16T13:30:45Z</updated>
      EOF
      200_000.times do |i|
        f << <<-EOF
        <entry>
          <id>tag:www.shop.ru,2005:Good/#{i}</id>
          <published>2009-09-16T13:05:25Z</published>
          <title>Good №#{i}</title>
          <content><a href="http://shop.ru/good/#{i}">Good №#{i}</a></content>
        </entry>
        EOF
      end
      f << "</feed>\n"
    end
  end
end