tl;dr:"Working for a famous tech company, I get asked a lot "Why don't you use technology X?" X may be an application, programming language, operating system, hypervisor, processor, or tool." Brendan provides a list of common reasons.
tl;dr:Brendan describes a weird performance issue he debugged: "A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. A quick check of basic performance statistics showed over 30% higher CPU consumption. What on Earth is Ubuntu doing that results in 30% higher CPU time!?"
tl;dr:Brendan was a consultant at Sun Microsystems and author of multiple Dtrace applications. Sun Microsystems, the original publishers of DTrace, introduced him to an "expert who was on a world tour demonstrating Sun's new DTrace-based product." When Brendan saw the product, he realized it was his own work being presented back to him.