The Ruby on Rails developer’s tool-belt includes a variety of utilities to assist in the creation, maintenance, and general up-keep of web applications and their hosts. There are a growing number of Ruby implementations and auxiliary tools at your disposal.
The Complete Idiot's Guide to Statistics, 2nd Edition
By Jr., Ph.D., Robert A. Donnelly
If your knowledge of statistics is a bit rusty (or you missed the topic the first time around), this book, title aside, is a good primer on the basics. Understanding statistics will greatly help when using performance analysis tools and services among other typical programming tasks.
Solaris(TM) Performance and Tools: DTrace and MDB Techniques for Solaris 10 and OpenSolaris (Solaris Series)
By Richard McDougall, Jim Mauro, and Brendan Gregg
While the primary focus of the book is performance analysis on Solaris, this book’s coverage of DTrace, a very powerful low level analysis tool, is very useful. Mac OS X now has a DTrace port, so it is possible to explore it there.