gistfile1.rb

require 'parallel'
require 'date'
require './pieces' # adds pieces function to Array objects


@things = []
100_000.times do |i|
  @things << { name: i.to_s, value: i }
end

# run 1
@sum = 0
start = Time.now
@sum = @things.map{ |t| t[:value] }.reduce(:+)
duration = Time.now - start

puts @sum
puts duration

# run 16 times
(1..50).each do |procs|
  (1..50).each do |pieces|
    start = Time.now
    @sum = Parallel.map( @things.pieces(pieces), :in_processes => procs ) { |subarray|
      subarray.map{ |thing| thing[:value] }.reduce(:+)
    }.reduce(:+)
    duration = Time.now - start

    puts "duration:#{duration} procs:#{procs} pieces:#{pieces}"
  end
end