Rubyでのベンチマークのやり方忘れそうなのでメモ

benchmark.rb

require "benchmark"

N = 10000000

Benchmark.benchmark Benchmark::CAPTION, 20, nil, "total", "average" do |bm|
  results       = {}

  candidates = {
    "some_candidate"    => ->(i){"do something".capitalize},
    "another_candidate" => ->(i){"do something".sub(/\A\w/) {|match| match.upcase}},
  }

  candidates.each do |name, proc|
    results[name] = bm.report name do
      N.times &proc
    end
  end

  [
    total = results.values.reduce(&:+),
    total / results.size,
  ]
end

times何回も書くのアレなのでprocにすると良さげだとおもた

                           user     system      total        real
some_candidate         3.800000   0.000000   3.800000 (  3.875910)
another_candidate      7.390000   0.010000   7.400000 (  7.498499)
total                 11.190000   0.010000  11.200000 ( 11.374409)
average                5.595000   0.005000   5.600000 (  5.687204)