Find fast app store download servers

appstore-avgtime.rb

#!/usr/bin/env ruby

# Run the following commands to find the fastest server.
#
# ./appstore-avgtime.rb > speed
# sort -n speed | head -n 10

STDOUT.sync = true

def pingavg(url, count = 10)
  cmd = "ping -c #{count} #{url}"
  $stderr.puts cmd
  lastline = `#{cmd}`.to_a[-1]
  lastline.split('/')[4].to_f
end

2000.times do |i|
  url = "a#{i+1}.phobos.apple.com"
  avg = pingavg url, 4
  puts "#{avg}\t#{url}"
end