difine_method_bench.rb

class Sandbag1
  def self.add1
    define_method(:hoge1){ puts "The method :hoge1 is called."; }
  end

  def self.remove1
    undef_method :hoge1
  rescue NameError => e
#     puts e
  end

  def self.add2
    define_method(:hoge2){ puts "The method :hoge2 is called."; }
  end

  def self.remove2
    undef_method :hoge2
  rescue NameError => e
#     puts e
  end

  def fib(n)
    return 0 if n == 0
    return 1 if n == 1
    fib(n-2) + fib(n-1)
  end
end

class Sandbag2
  def self.add1
    define_method(:hoge1){ puts "The method :hoge1 is called."; }
  end

  def self.remove1
    undef_method :hoge1
  rescue NameError => e
#     puts e
  end
end

fib_n = ARGV[0].to_i
add_rem_n = ARGV[1].to_i
times_benchmark = 4
require "benchmark"

puts
puts "Almost no lock contention (calculate Fibonacchi sequence)"
Benchmark.bm(10) { |bm|
  times_benchmark.times { |i|
    bm.report("1 thread  (#{i})") {
      t1 = Thread.new(fib_n){|n| Sandbag1.new.fib(n) }
      t1.join
    }
    bm.report("2 threads (#{i})") {
      t1 = Thread.new(fib_n){|n| Sandbag1.new.fib(n) }
      t2 = Thread.new(fib_n){|n| Sandbag1.new.fib(n) }
      t1.join
      t2.join
    }
  }
}

puts
puts "Add/remove the SAME method for the SAME class object"
Benchmark.bm(10) { |bm|
  times_benchmark.times { |i|
    bm.report("1 thread  (#{i})") {
      t1 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t1.join
    }
    bm.report("2 threads (#{i})") {
      t1 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t2 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t1.join
      t2.join
    }
  }
}

puts
puts "Add/remove different methods for the SAME class object"
Benchmark.bm(10) { |bm|
  times_benchmark.times { |i|
    bm.report("1 thread  (#{i})") {
      t1 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t1.join
    }
    bm.report("2 threads (#{i})") {
      t1 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t2 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add2; Sandbag1.remove2; }}
      t1.join
      t2.join
    }
  }
}

puts
puts "Add/remove different methods for different class objects"
Benchmark.bm(10) { |bm|
  times_benchmark.times { |i|
    bm.report("1 thread  (#{i})") {
      t1 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t1.join
    }
    bm.report("2 threads (#{i})") {
      t1 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag1.add1; Sandbag1.remove1; }}
      t2 = Thread.new(add_rem_n){|n| n.times{|m| Sandbag2.add1; Sandbag2.remove1; }}
      t1.join
      t2.join
    }
  }
}