Benchmark(wip)
https://docs.ruby-lang.org/ja/latest/class/Benchmark.html
https://docs.ruby-lang.org/ja/latest/method/Benchmark/m/bmbm.html
https://github.com/evanphx/benchmark-ips
https://github.com/michaelherold/benchmark-memory
https://github.com/ruby/ruby/blob/master/lib/benchmark.rb
GC.start