thread-io-bound.rb

require 'open-uri'
require 'benchmark'

URL = 'http://google.com'
TIMES = 10.times

def without_threads
  TIMES.map { open(URL) }
end

def with_threads
  TIMES.map do
    Thread.new { open(URL) }
  end.each(&:join)
end

puts "Without threads:"
puts Benchmark.measure { without_threads }

puts "With threads"
puts Benchmark.measure { with_threads }