hamster_hash_merge_benchmark.rb

require "benchmark/ips"
require "hamster/hash"
require "hamster/version"

puts "OS Name: #{`uname -s -r -v -m -p -i -o`}"
puts "Ruby Version: #{`ruby -v`}"
puts "RubyGems Version: #{`gem -v`}"
puts "RVM Version: #{`rvm -v`}"
puts "Hamster version: #{Hamster::VERSION}"

def benchmark_merges(hash_size)
  puts
  puts
  puts
  Benchmark.ips do |b|
    keys_a = (1..hash_size).to_a
    values_a = keys_a.map { |k| "a-#{k}" }
    hash_a = Hamster.hash(keys_a.zip(values_a))
    keys_b = ((hash_size/2)..(hash_size*3/2)).to_a
    values_b = keys_a.map { |k| "b-#{k}" }
    hash_b = Hamster.hash(keys_b.zip(values_b))

    b.report "old_merge(N=#{hash_size})" do
      hash_a.old_merge(hash_b)
    end

    b.report "merge(N=#{hash_size})" do
      hash_a.merge(hash_b)
    end

    b.compare!
  end
end

benchmark_merges(10)
benchmark_merges(20)
benchmark_merges(50)
benchmark_merges(100)
benchmark_merges(1000)

results2.txt

OS Name: Linux 2.6.32-431.30.1.el6.x86_64 #1 SMP Wed Jul 30 14:44:26 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux
Ruby Version: ruby 2.1.3p242 (2014-09-19 revision 47630) [x86_64-linux]
RubyGems Version: 2.2.2
RVM Version: rvm 1.25.33 (stable) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
Hamster version: 1.0.1-rc2



Calculating -------------------------------------
     old_merge(N=10)      2467 i/100ms
         merge(N=10)      3668 i/100ms
-------------------------------------------------
     old_merge(N=10)    24102.7 (±7.6%) i/s -     120883 in   5.048146s
         merge(N=10)    36664.0 (±5.8%) i/s -     183400 in   5.020794s

Comparison:
         merge(N=10):    36664.0 i/s
     old_merge(N=10):    24102.7 i/s - 1.52x slower




Calculating -------------------------------------
     old_merge(N=20)      1175 i/100ms
         merge(N=20)      1640 i/100ms
-------------------------------------------------
     old_merge(N=20)    11590.7 (±11.2%) i/s -      57575 in   5.037649s
         merge(N=20)    17729.1 (±7.7%) i/s -      88560 in   5.027350s

Comparison:
         merge(N=20):    17729.1 i/s
     old_merge(N=20):    11590.7 i/s - 1.53x slower




Calculating -------------------------------------
     old_merge(N=50)       403 i/100ms
         merge(N=50)       542 i/100ms
-------------------------------------------------
     old_merge(N=50)     4096.4 (±3.8%) i/s -      20553 in   5.026043s
         merge(N=50)     5454.1 (±1.0%) i/s -      27642 in   5.068634s

Comparison:
         merge(N=50):     5454.1 i/s
     old_merge(N=50):     4096.4 i/s - 1.33x slower




Calculating -------------------------------------
    old_merge(N=100)       219 i/100ms
        merge(N=100)       298 i/100ms
-------------------------------------------------
    old_merge(N=100)     2237.3 (±2.0%) i/s -      11388 in   5.092143s
        merge(N=100)     2983.3 (±1.2%) i/s -      15198 in   5.095135s

Comparison:
        merge(N=100):     2983.3 i/s
    old_merge(N=100):     2237.3 i/s - 1.33x slower




Calculating -------------------------------------
   old_merge(N=1000)        14 i/100ms
       merge(N=1000)        18 i/100ms
-------------------------------------------------
   old_merge(N=1000)      151.4 (±2.6%) i/s -        770 in   5.091162s
       merge(N=1000)      185.3 (±2.7%) i/s -        936 in   5.053930s

Comparison:
       merge(N=1000):      185.3 i/s
   old_merge(N=1000):      151.4 i/s - 1.22x slower