I am writing a Ruby book named “I Love Ruby” for some time. You can get
it here https://cloud.openmailbox.org/index.php/s/u4sX065QRgjbJL2/download
Have added Benchmark chapter to this book. Would love to hear suggestions and feedback.
I would be grateful if you can use and contribute to http://openmailbox.org through which I am distributing this book.