eval.rb

NUMBER_OF_TRIALS = 3

iterators = (0..12).map { |item| 2 ** item }

iterators.each do |item|
  `g++ -O2 -Wall -W -static -std=c++0x -D NUM_COUNTER=#{item} main.cc -o arch.out`

  sum = 0

  NUMBER_OF_TRIALS.times do
    result = `/usr/bin/time -p ./arch.out 2>&1 | grep real | sed -e "s/real//"`
    sum += result.to_f
  end

  puts "%4d, %.2f" % [item, sum / NUMBER_OF_TRIALS]
end