dynamodb_futuroscope.rb

require 'benchmark'
require 'aws-sdk'
require 'forwardable'
require 'futuroscope/convenience'

region = AWS.regions['eu-west-1']
table = region.dynamo_db.tables['futuroscope']

unless table.exists?
  table = region.dynamo_db.tables.create('futuroscope', 10, 5,
                                         hash_key: { id: :number })
  sleep 1 while table.status == :creating
end
table.load_schema
table.items.each(&:delete)

1.upto(5) do |index|
  table.items.create(id: index, value: index.to_s * 90)
end

puts 'starting loop'

3.times do
  puts(Benchmark.realtime do
    1.upto(5) do |index|
      table.items[index].attributes[:value]
    end
  end)

  puts(Benchmark.realtime do
    (1..5).collect do |index|
      future { table.items[index].attributes[:value] }
    end.each do |value|
      value.to_s
    end
  end)
  puts '---'
  sleep 1
end


# scp test.rb host:~ && ssh host AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY ruby test.rb