ruby_benchmark_string_formatting.rb

# frozen_string_literal: true

puts "Ruby #{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}:\n"

require 'benchmark/ips'

puts
puts '* #to_s:'
puts

Benchmark.ips do |x|
  value = 'Totoro'

  x.report('%s formatter') do
    'Hello, %s!' % value
  end

  x.report('interpolation') do
    "Hello, #{value}!"
  end

  x.compare!
end

puts
puts '* #inspect:'
puts

Benchmark.ips do |x|
  value = { x: 123, y: 456 }

  x.report('%p formatter') do
    'Hello, %p!' % value
  end

  x.report('interpolation') do
    "Hello, #{value.inspect}!"
  end

  x.compare!
end

# Ruby 2.3.0-p0:
#
# * #to_s:
#
# Calculating -------------------------------------
#         %s formatter    47.512k i/100ms
#        interpolation    83.395k i/100ms
# -------------------------------------------------
#         %s formatter      1.074M (± 5.3%) i/s -      5.369M
#        interpolation      2.688M (± 3.2%) i/s -     13.427M
#
# Comparison:
#        interpolation:  2687669.1 i/s
#         %s formatter:  1073790.1 i/s - 2.50x slower
#
#
# * #inspect:
#
# Calculating -------------------------------------
#         %p formatter    15.685k i/100ms
#        interpolation    20.331k i/100ms
# -------------------------------------------------
#         %p formatter    218.396k (± 1.4%) i/s -      1.098M
#        interpolation    298.252k (± 1.4%) i/s -      1.504M
#
# Comparison:
#        interpolation:   298252.1 i/s
#         %p formatter:   218396.3 i/s - 1.37x slower
#
#
#
# Ruby 2.2.4-p230:
#
# * #to_s:
#
# Calculating -------------------------------------
#         %s formatter    40.533k i/100ms
#        interpolation    75.439k i/100ms
# -------------------------------------------------
#         %s formatter      1.027M (± 2.4%) i/s -      5.148M
#        interpolation      2.489M (± 0.5%) i/s -     12.447M
#
# Comparison:
#        interpolation:  2488572.8 i/s
#         %s formatter:  1026828.9 i/s - 2.42x slower
#
#
# * #inspect:
#
# Calculating -------------------------------------
#         %p formatter    15.235k i/100ms
#        interpolation    20.327k i/100ms
# -------------------------------------------------
#         %p formatter    207.339k (± 1.4%) i/s -      1.051M
#        interpolation    295.857k (± 1.6%) i/s -      1.484M
#
# Comparison:
#        interpolation:   295856.9 i/s
#         %p formatter:   207338.8 i/s - 1.43x slower
#
#
#
# Ruby 2.1.7-p400:
#
# * #to_s:
#
# Calculating -------------------------------------
#         %s formatter    46.336k i/100ms
#        interpolation    81.078k i/100ms
# -------------------------------------------------
#         %s formatter      1.057M (± 2.2%) i/s -      5.282M
#        interpolation      2.387M (± 1.7%) i/s -     12.000M
#
# Comparison:
#        interpolation:  2386831.6 i/s
#         %s formatter:  1056918.5 i/s - 2.26x slower
#
#
# * #inspect:
#
# Calculating -------------------------------------
#         %p formatter    15.573k i/100ms
#        interpolation    20.277k i/100ms
# -------------------------------------------------
#         %p formatter    203.965k (± 1.7%) i/s -      1.028M
#        interpolation    303.404k (± 0.6%) i/s -      1.521M
#
# Comparison:
#        interpolation:   303404.4 i/s
#         %p formatter:   203964.8 i/s - 1.49x slower
#