OSCON2008 Full-stack Introspection Crash Course

The document discusses Theo's qualifications for providing advice on performance and scalability. It introduces the concept of full-stack introspection using DTrace, which allows seeing the entire software stack at once, including operating systems like Linux, databases like MySQL and PostgreSQL, and programming languages like PHP, Perl, Java, Ruby, C, and C++. DTrace is described as a dynamic tracing framework created by Sun Microsystems to provide comprehensive monitoring of the entire software stack.