Wow this is an incredibly interesting and accessible article on performance tuning. I have two questions: 1) Is there an easy tutorial somewhere on calling ou

Wow this is an incredibly interesting and accessible article on performance tuning. I have two questions: 1) Is there an easy tutorial somewhere on calling out to native code from Ruby? 2) Could the team at Github possible give a little more detail on what you did to get all of those pretty benchmarking graphs? How did you get all of the info on memory usage and CPU activity (I assume it wasn't just time {command} > file.txt)