Benchmark: Select from an Ohm Model's All Set vs Arrays Directly Returned by Redis

benchmark.rb

require 'benchmark'

User.all.size #=> 30000

Benchmark.bm(30) do |bm|
  bm.report 'User Instances' do
    User.all
      .select { |user| user.lastname.downcase == 'erol' }
  end
  
  bm.report 'Redis-Returned Arrays' do
    ids = User.all.key.sort(by: '#', get: ['#', 'User:*->firstname'])
      .select { |values| values[1].downcase == 'erol' }
      .map { |values| values[0] }
    User.all.fetch ids
  end
end

results.txt

                                     user     system      total        real
Ohm Model Instances             56.700000   1.350000  58.050000 ( 58.561028)
Redis-Returned Arrays            1.840000   0.020000   1.860000 (  2.171307)