Lotus::Utils::Attributes: benchmark String vs Symbol as keys

utils_attributes_bench.rb

#!/usr/bin/env ruby
require 'benchmark/ips'
require 'allocation_stats'
require_relative './lib/lotus/utils/hash'
require_relative './lib/lotus/utils/attributes'
require_relative './lib/lotus/utils/attributes_sym'

TIMES  = 1_000
RAW    = Hash[(1..100).map {|i| [i.to_s * 10, i]}]
string = Lotus::Utils::Attributes.new(RAW)
symbol = Lotus::Utils::AttributesSym.new(RAW)

key_string = '100'.freeze
key_symbol = key_string.to_sym.freeze

puts "BENCHMARK:\n\n"

Benchmark.ips do |x|
  x.report('#initialize (string)') { Lotus::Utils::Attributes.new(RAW) }
  x.report('#initialize (symbol)') { Lotus::Utils::AttributesSym.new(RAW) }

  x.report('#get (string w/ string)') { string.get(key_string) }
  x.report('#get (string w/ sym)'   ) { string.get(key_symbol) }

  x.report('#get (symbol w/ string)') { symbol.get(key_string) }
  x.report('#get (symbol w/ sym)'   ) { symbol.get(key_symbol) }
end

puts "\nOBJECTS ALLOCATIONS:\n\n"

def trace_allocations(label, &blk)
  stats = AllocationStats.trace do
    TIMES.times(&blk)
  end

  puts "Allocations for: #{ label }"
  puts stats.allocations(alias_paths: true).group_by(:sourcefile, :sourceline, :class).to_text
end

trace_allocations '#initialize (string)' do
  Lotus::Utils::Attributes.new(RAW)
end

trace_allocations '#initialize (symbol)' do
  Lotus::Utils::AttributesSym.new(RAW)
end

trace_allocations '#get (string w/ string)' do
  string.get(key_string)
end

trace_allocations '#get (string w/ sym)' do
  string.get(key_symbol)
end

trace_allocations '#get (symbol w/ string)' do
  symbol.get(key_string)
end

trace_allocations '#get (symbol w/ sym)' do
  symbol.get(key_symbol)
end

__END__
Results:

  BENCHMARK:

  Calculating -------------------------------------
  #initialize (string)             657.000  i/100ms
  #initialize (symbol)             771.000  i/100ms
  #get (string w/ string)           41.014k i/100ms
  #get (string w/ sym)              33.976k i/100ms
  #get (symbol w/ string)           37.679k i/100ms
  #get (symbol w/ sym)              41.791k i/100ms
  -------------------------------------------------
  #initialize (string)      6.764k (± 5.7%) i/s -     34.164k
  #initialize (symbol)      7.870k (± 6.4%) i/s -     39.321k
  #get (string w/ string)   1.575M (±10.8%) i/s -      7.793M
  #get (string w/ sym)      1.258M (±13.1%) i/s -      6.150M
  #get (symbol w/ string)   1.433M (± 7.3%) i/s -      7.159M
  #get (symbol w/ sym)      1.672M (± 7.9%) i/s -      8.316M



  OBJECTS ALLOCATIONS:

  Allocations for: #initialize (string)
                    sourcefile                     sourceline           class            count
  -----------------------------------------------  ----------  ------------------------  -----
  <PWD>/lib/lotus/utils/hash.rb                            79  String                      100
  <GEM:lotus-utils-0.3.1>/lib/lotus/utils/hash.rb         174  String                       99
  <GEM:lotus-utils-0.3.1>/lib/lotus/utils/hash.rb         135  Array                      1000
  <PWD>/lib/lotus/utils/attributes.rb                      33  Lotus::Utils::Hash         1000
  attributes_bench.rb                                      41  Lotus::Utils::Attributes   1000

  Allocations for: #initialize (symbol)
                    sourcefile                     sourceline             class             count
  -----------------------------------------------  ----------  ---------------------------  -----
  <GEM:lotus-utils-0.3.1>/lib/lotus/utils/hash.rb         135  Array                         1000
  <PWD>/lib/lotus/utils/attributes_sym.rb                  33  Lotus::Utils::Hash            1000
  attributes_bench.rb                                      45  Lotus::Utils::AttributesSym   1000

  Allocations for: #get (string w/ string)
  sourcefile  sourceline  class  count
  ----------  ----------  -----  -----

  Allocations for: #get (string w/ sym)
              sourcefile               sourceline  class   count
  -----------------------------------  ----------  ------  -----
  <PWD>/lib/lotus/utils/attributes.rb          61  String   1000

  Allocations for: #get (symbol w/ string)
  sourcefile  sourceline  class  count
  ----------  ----------  -----  -----

  Allocations for: #get (symbol w/ sym)
  sourcefile  sourceline  class  count
  ----------  ----------  -----  -----

Ruby:

    ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin13.0]

Hardware:

    Hardware Overview:

      Model Name: MacBook Air
      Model Identifier: MacBookAir5,2
      Processor Name: Intel Core i7
      Processor Speed: 2 GHz
      Number of Processors: 1
      Total Number of Cores: 2
      L2 Cache (per Core): 256 KB
      L3 Cache: 4 MB
      Memory: 8 GB
      Boot ROM Version: MBA51.00EF.B02
      SMC Version (system): 2.5f9

Software:

    System Software Overview:

      System Version: OS X 10.9.5 (13F34)
      Kernel Version: Darwin 13.4.0
      Time since boot: 10 days 9:20