cache_warmer.rb

#!/usr/bin/env ruby
require 'typhoeus'

HOST = 'http://yourhost.com'
CONCURRENTS = 5

urls = File.readlines(ARGV.shift)
hydra = Typhoeus::Hydra.new

queue_req = lambda do |resp|
  return if urls == []
  url = HOST + urls.pop
  puts "Processing: #{url}"
  req = Typhoeus::Request.new(url)
  req.on_complete(&queue_req)
  hydra.queue(req)
end

CONCURRENTS.times { queue_req.call(0) }

hydra.run