jonleighton

require 'benchmark/ips'

bar = 'bar'

Benchmark.ips do |r|
  r.report('concatenation') { 'foo' << bar }
  r.report('interpolation') { "foo#{bar}"  }
end

jonleighton

require 'benchmark/ips'

class Foo1
  def initialize
    @bar = :bar
  end

  attr_reader :bar
end

jonleighton

Calculating -------------------------------------
              symbol     51632 i/100ms
              string     46997 i/100ms
-------------------------------------------------
              symbol  2537871.3 (±1.1%) i/s -   12701472 in   5.005420s
              string  1664204.2 (±7.7%) i/s -    8271472 in   5.012292s

jonleighton

require 'active_record'
require 'benchmark/ips'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')

class Post < ActiveRecord::Base
  connection.create_table :posts do |t|
    t.string :name
  end
end

jonleighton

require 'benchmark/ips'

class A
  def initialize
    @attributes = { :foo => 1 }
  end

  def foo
    @attributes[:foo]
  end

jonleighton

$ ruby test.rb
Calculating -------------------------------------
             success     51960 i/100ms
             failure      4653 i/100ms
-------------------------------------------------
             success  2687778.5 (±3.7%) i/s -   13405680 in   4.996239s
             failure    53863.7 (±3.5%) i/s -     269874 in   5.016999s

jonleighton

$ ruby test.rb false
  0.210000   0.000000   0.210000 (  0.212155)
$ ruby test.rb true
 10.000000   0.280000  10.280000 ( 10.773232)

jonleighton

Generating data...
Inserting 20000 users and exhibits...
Calculating -------------------------------------
            Model#id      9279 i/100ms
Model.new (instantiation)
                          2056 i/100ms
Model.new (setting attributes)
                           890 i/100ms
         Model.first       178 i/100ms
Model.all limit(100)         5 i/100ms

jonleighton

require 'benchmark/ips'

h = { foo: :bar }

Benchmark.ips do |r|
  r.report('#[]')    { h[:foo] }
  r.report('#fetch') { h.fetch(:foo) }
end

jonleighton

Operating system: Mac OS X
                  10.7.4 11E53
CPU: x86
     GenuineIntel family 6 model 42 stepping 7
     4 CPUs

Crash reason:  EXC_BAD_ACCESS / KERN_INVALID_ADDRESS
Crash address: 0x6e6f4640

Thread 0 (crashed)