Tests for multi threading.

ruby version -> ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin17]

# Sequential processing

require 'benchmark'
require 'open-uri'
require 'json'

Benchmark.bm do |x|
  x.report('without parallel processing - ') do
    100.times do |i|
      response = open('http://ip.jsontest.com/').read
      data = JSON.parse(response)['ip']
      puts data
    end
  end
end

Time noted -> 96 sec

# With forking (multi processing)

require 'benchmark'
require 'open-uri'
require 'json'

Benchmark.bm do |x|
  x.report('with parallel processing - ') do
    100.times do |i|
      fork do
        response = open('http://ip.jsontest.com/').read
        data = JSON.parse(response)['ip']
        puts data
      end
    end
  end
end

Time noted -> 1.06 sec

# With Multi threading

require 'benchmark'
require 'open-uri'
require 'json'

threads = []

Benchmark.bm do |x|
  x.report('with multiple threading - ') do
    100.times do |i|
      threads << Thread.new do
        response = open('http://ip.jsontest.com/').read
        data = JSON.parse(response)['ip']
        puts data
      end
    end
  threads.map(&:join)
  end
end

Time Noted -> 6.39 sec