combining-arrays.rb

require 'bench_press'
extend BenchPress

data = [[%w{a b c d e f}, %w{d e f g h i}], [%w{a b c d e f}, %w{g h i j k l}]]

data.each_with_index do |(a, b), i|
  measure "arithmetic operators ##{i+1}" do
    a + (b - a)
  end

  measure "uniq ##{i+1}" do
    (a + b).uniq
  end

  measure "uniq! ##{i+1}" do
    (a + b).uniq!
  end

  measure "union ##{i+1}" do
    a | b
  end
end

output-1.8.7.txt

Combining Arrays
================
Date: June 23, 2011  

System Information
------------------
    Operating System:    Ubuntu 11.04
    CPU:                 Intel(R) Core(TM)2 Quad  CPU   Q9300  @ 2.50GHz
    Processor Count:     4
    Memory:              3.87 GB
    ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-linux]

"arithmetic operators #2" is up to 30% faster over 1,000 repetitions
--------------------------------------------------------------------

    arithmetic operators #2    0.00320291519165039 secs    Fastest
    arithmetic operators #1    0.00329899787902832 secs    2% Slower
    uniq! #2                   0.00386905670166016 secs    17% Slower
    uniq #2                    0.00391983985900879 secs    18% Slower
    union #1                   0.00416898727416992 secs    23% Slower
    uniq! #1                   0.00430393218994141 secs    25% Slower
    union #2                   0.00440812110900879 secs    27% Slower
    uniq #1                    0.00458908081054688 secs    30% Slower

output-1.9.2.txt

Combining Arrays
================
Date: June 23, 2011  

System Information
------------------
    Operating System:    Ubuntu 11.04
    CPU:                 Intel(R) Core(TM)2 Quad  CPU   Q9300  @ 2.50GHz
    Processor Count:     4
    Memory:              3.87 GB
    ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux]

"arithmetic operators #1" is up to 72% faster over 1,000 repetitions
--------------------------------------------------------------------

    arithmetic operators #1    0.0026226043701171875 secs    Fastest
    arithmetic operators #2    0.0030150413513183594 secs    13% Slower
    uniq! #1                   0.00484919548034668   secs    45% Slower
    uniq #1                    0.004903078079223633  secs    46% Slower
    union #1                   0.005164146423339844  secs    49% Slower
    uniq! #2                   0.009515762329101562  secs    72% Slower
    union #2                   0.009597301483154297  secs    72% Slower
    uniq #2                    0.009701251983642578  secs    72% Slower