Benchmark for executing logic from If, Case and Hash

.ruby-version

ruby-2.3-head-railsexpress

if_case_hash.rb

#!/usr/bin/env ruby

require 'benchmark'
require 'ruby-prof'

count = 1000
array = (1..1_000).map { rand }
variants = [true, false]

Benchmark.bmbm(5) do |bm|
  bm.report('if') do
    variants.cycle(count) do |variant|
      if variant
        array.sort
      else
        array.sort
      end
    end
  end

  bm.report('case') do
    variants.cycle(count) do |variant|
      case variant
      when true
        array.sort
      when false
        array.sort
      end
    end
  end

  bm.report('hash') do
    variants.cycle(count) do |variant|
      {
        true => -> { array.sort },
        false => -> { array.sort }
      }[variant].call
    end
  end
end

[RubyProf::GC_TIME, RubyProf::MEMORY].each do |mode|
  RubyProf.measure_mode = mode

  puts "\n\nIF\n"
  RubyProf.start
    variants.cycle(count) do |variant|
      if variant
        array.sort
      else
        array.sort
      end
    end
  RubyProf::FlatPrinter.new(RubyProf.stop).print(STDOUT)

  puts "\n\nCASE\n"
  RubyProf.start
    variants.cycle(count) do |variant|
      case variant
      when true
        array.sort
      when false
        array.sort
      end
    end
  RubyProf::FlatPrinter.new(RubyProf.stop).print(STDOUT)

  puts "\n\nHASH\n"
  RubyProf.start
    variants.cycle(count) do |variant|
      {
        true => -> { array.sort },
        false => -> { array.sort }
      }[variant].call
    end
  RubyProf::FlatPrinter.new(RubyProf.stop).print(STDOUT)
end

# RESULTS
# Rehearsal -----------------------------------------
# if      1.500000   0.020000   1.520000 (  1.537125)
# case    1.530000   0.010000   1.540000 (  1.561478)
# hash    1.540000   0.020000   1.560000 (  1.575083)
# -------------------------------- total: 4.620000sec

#             user     system      total        real
# if      1.510000   0.010000   1.520000 (  1.557586)
# case    1.540000   0.010000   1.550000 (  1.587463)
# hash    1.560000   0.000000   1.560000 (  1.578515)


# IF
# Measure Mode: gc_time
# Thread ID: 70170378975240
# Fiber ID: 70170375037540
# Total: 0.000497
# Sort by: self_time

#  %self      total      self      wait     child     calls  name
# 100.00      0.000     0.000     0.000     0.000     2000   Array#sort
#   0.00      0.000     0.000     0.000     0.000 19648000   Float#<=>
#   0.00      0.000     0.000     0.000     0.000        1   Array#cycle
#   0.00      0.000     0.000     0.000     0.000        1   Global#[No method]

# * indicates recursively called methods


# CASE
# Measure Mode: gc_time
# Thread ID: 70170378975240
# Fiber ID: 70170375037540
# Total: 0.001162
# Sort by: self_time

#  %self      total      self      wait     child     calls  name
# 100.00      0.001     0.001     0.000     0.000     2000   Array#sort
#   0.00      0.000     0.000     0.000     0.000 19648000   Float#<=>
#   0.00      0.001     0.000     0.000     0.001        1   Array#cycle
#   0.00      0.001     0.000     0.000     0.001        1   Global#[No method]

# * indicates recursively called methods


# HASH
# Measure Mode: gc_time
# Thread ID: 70170378975240
# Fiber ID: 70170375037540
# Total: 0.003833
# Sort by: self_time

#  %self      total      self      wait     child     calls  name
#  67.41      0.004     0.003     0.000     0.001        1   Array#cycle
#  32.59      0.001     0.001     0.000     0.000     2000   Array#sort
#   0.00      0.000     0.000     0.000     0.000 19648000   Float#<=>
#   0.00      0.004     0.000     0.000     0.004        1   Global#[No method]

# * indicates recursively called methods


# IF
# Measure Mode: memory
# Thread ID: 70170378975240
# Fiber ID: 70170375037540
# Total: 32002.359375
# Sort by: self_time

#  %self      total      self      wait     child     calls  name
#  99.99  32000.781 32000.391     0.000     0.391     2000   Array#sort
#   0.00  32002.359     1.188     0.000 32001.172        1   Global#[No method]
#   0.00      0.391     0.391     0.000     0.000 19648000   Float#<=>
#   0.00  32001.172     0.391     0.000 32000.781        1   Array#cycle

# * indicates recursively called methods


# CASE
# Measure Mode: memory
# Thread ID: 70170378975240
# Fiber ID: 70170375037540
# Total: 32002.359375
# Sort by: self_time

#  %self      total      self      wait     child     calls  name
#  99.99  32000.781 32000.391     0.000     0.391     2000   Array#sort
#   0.00  32002.359     1.188     0.000 32001.172        1   Global#[No method]
#   0.00      0.391     0.391     0.000     0.000 19648000   Float#<=>
#   0.00  32001.172     0.391     0.000 32000.781        1   Array#cycle

# * indicates recursively called methods


# HASH
# Measure Mode: memory
# Thread ID: 70170378975240
# Fiber ID: 70170375037540
# Total: 32721.187500
# Sort by: self_time

#  %self      total      self      wait     child     calls  name
#  97.80  32000.781 32000.391     0.000     0.391     2000   Array#sort
#   2.20  32720.000   719.219     0.000 32000.781        1   Array#cycle
#   0.00  32721.188     1.188     0.000 32720.000        1   Global#[No method]
#   0.00      0.391     0.391     0.000     0.000 19648000   Float#<=>

# * indicates recursively called methods