Benchmarking BCrypt

benchmark_bcrypt.rb

require 'benchmark'
require 'bcrypt'

(5..15).to_a.each do |i| 
  bm = Benchmark.measure { BCrypt::Password.create('I have a hairy cat', cost: i) }
  puts "cost: #{i} \t #{bm}"
end

#=> cost: 5            0.010000   0.000000   0.010000 (  0.001988)
#=> cost: 6            0.000000   0.000000   0.000000 (  0.004081)
#=> cost: 7            0.010000   0.000000   0.010000 (  0.008516)
#=> cost: 8            0.010000   0.000000   0.010000 (  0.015666)
#=> cost: 9            0.030000   0.010000   0.040000 (  0.031448)
#=> cost: 10           0.060000   0.000000   0.060000 (  0.062378)
#=> cost: 11           0.130000   0.000000   0.130000 (  0.124678)
#=> cost: 12           0.230000   0.000000   0.230000 (  0.240915)
#=> cost: 13           0.480000   0.000000   0.480000 (  0.483705)
#=> cost: 14           0.960000   0.010000   0.970000 (  0.966589)
#=> cost: 15           1.900000   0.000000   1.900000 (  1.925419)