multibench: useful for benchmarking columns in html tables for example.

multibench.rb

class Multibench
  def initialize
    @benches = Hash.new { 0 } 
  end 

  def bench(title)
    start = Time.now
    yield.tap do
      @benches[title] += Time.now - start
    end 
  end 

  def benches
    @benches.sort_by { |title, time| -time }
  end 
end

if __FILE__ == $0
  multibench = Multibench.new

  multibench.bench("foo") { sleep(0.1) }
  multibench.bench("bar") { sleep(0.3) }
  multibench.bench("foo") { sleep(0.1) }

  multibench.benches.each do |title_and_time|
    puts "%-20s %.2fs" % title_and_time
  end 
end