normal select vs lazy select

normal_vs_lazy_1.rb

require 'benchmark'

def normal_selector(array, word)
  array.select{|hash| hash[:name].match "#{word}"}.to_a
end

def lazy_selector(array, word)
  array.lazy.select{|hash| hash[:name].match "#{word}"}.to_a
end

def benchmark(array)
  puts "** #{array.size}個のデータを100回検索"
  Benchmark.bm(16) do |target|
    target.report('normal_selector') { 100.times { normal_selector(array, '3') } }
    target.report('lazy_selector')   { 100.times { lazy_selector(array, '3') } }
  end
end

def generate_array(size)
  (1..size).map{|n| {name: "test#{n}", order: n}}
end

[100, 1000, 10000].each do |array_size|
  benchmark(generate_array(array_size))
end

normal_vs_lazy_2.rb

require 'benchmark'

def normal_selector(array, word)
  array.select{|hash| hash[:name].match "#{word}"}.first(10)
end

def lazy_selector(array, word)
  array.lazy.select{|hash| hash[:name].match "#{word}"}.first(10)
end

def benchmark(array)
  puts "** #{array.size}個のデータを100回検索"
  Benchmark.bm(16) do |target|
    target.report('normal_selector') { 100.times { normal_selector(array, '3') } }
    target.report('lazy_selector')   { 100.times { lazy_selector(array, '3') } }
  end
end

def generate_array(size)
  (1..size).map{|n| {name: "test#{n}", order: n}}
end

[100, 1000, 10000].each do |array_size|
  benchmark(generate_array(array_size))
end

result_1.txt

** 100個のデータを100回検索
                       user     system      total        real
normal_selector    0.040000   0.000000   0.040000 (  0.040522)
lazy_selector      0.040000   0.000000   0.040000 (  0.044772)

** 1000個のデータを100回検索
                       user     system      total        real
normal_selector    0.390000   0.000000   0.390000 (  0.392909)
lazy_selector      0.430000   0.000000   0.430000 (  0.434679)

** 10000個のデータを100回検索
                       user     system      total        real
normal_selector    4.210000   0.040000   4.250000 (  4.248381)
lazy_selector      4.580000   0.010000   4.590000 (  4.595210)

result_2.txt

** 100個のデータを100回検索
                       user     system      total        real
normal_selector    0.040000   0.000000   0.040000 (  0.044624)
lazy_selector      0.020000   0.000000   0.020000 (  0.017945)

** 1000個のデータを100回検索
                       user     system      total        real
normal_selector    0.440000   0.000000   0.440000 (  0.437309)
lazy_selector      0.020000   0.000000   0.020000 (  0.019867)

** 10000個のデータを100回検索
                       user     system      total        real
normal_selector    4.820000   0.040000   4.860000 (  4.860706)
lazy_selector      0.020000   0.000000   0.020000 (  0.023823)