You need to update the s3.yml file with your S3 account information and run
bundle install. Then you can run either of the two included scripts:
On my machine (Mac OS X) when I run the https script the CPU spikes to 100% and the event loop is blocked for a couple of minutes before the file starts to transfer. However, the http version does not block the event loop, uses almost no CPU, and starts transferring data right away.