eta.rb

require './ring_buffer.rb'

iterations = 1000
RING_SIZE  = 25
ring = RingBuffer.new(RING_SIZE)

iterations.times do |i|

  time_start = Time.now
  400000.times do |t|
    [t, Math.sqrt(rand(200000)), Math.sqrt(t)**2]
  end
  time_now = Time.now

  time_taken = time_now - time_start
  ring << time_taken

  puts "time taken for compute block: #{time_taken}"

  if ring.full?
    #https://stackoverflow.com/questions/1341271/how-do-i-create-an-average-from-a-ruby-array
    moving_average = ring.buffer.inject{ |sum, el| sum + el }.to_f / RING_SIZE
    time_left = moving_average * (iterations - i)
    puts "time_left: #{time_left}, minutes: #{(time_left/60.0).round(2)}"
    puts "--------------------------------------"
  end