micro benchmarks with benchmark-ips

ko1.rb

require 'benchmark'
require 'benchmark/ips'
 
outer_b = 0
Benchmark.ips do |x|
  outer_a = 0
  x.report "inner a block" do
    inner_a = 1
  end

  x.report "outer a block" do
    outer_a = 1
  end

  x.report "outer b block" do
    outer_b = 1
  end

  x.report "inner a block var" do |t|
    t.times { inner_a = 1 }
  end

  x.report "outer a block var" do |t|
    t.times { outer_a = 1 }
  end

  x.report "outer b block var" do |t|
    t.times { outer_b = 1 }
  end

  x.report "inner a block var while" do |t|
    i = 0
    while i < t
      inner_a = 1
      i += 1
    end
  end

  x.report "inner a string", "inner_a = 1"
end

output.txt

zero :: ~/scratch> ruby ko1.rb
Calculating -------------------------------------
       inner a block   129.411k i/100ms
       outer a block   132.007k i/100ms
       outer b block   127.053k i/100ms
   inner a block var   119.593k i/100ms
   outer a block var   116.482k i/100ms
   outer b block var   120.291k i/100ms
inner a block var while
                       129.009k i/100ms
      inner a string   158.832k i/100ms
-------------------------------------------------
       inner a block      8.877M (±15.6%) i/s -     43.353M
       outer a block      8.765M (±14.6%) i/s -     42.902M
       outer b block      8.817M (±14.0%) i/s -     43.198M
   inner a block var     18.502M (±19.2%) i/s -     88.618M
   outer a block var     19.170M (±17.7%) i/s -     92.370M
   outer b block var     18.242M (±18.0%) i/s -     87.692M
inner a block var while
                         39.581M (±19.3%) i/s -    188.869M
      inner a string     39.627M (±18.5%) i/s -    189.963M