It's been five years since DTrace has been integrated into Solaris.
It's one of the most important technologies in Operating Systems.
Read Bryan's blog entry on last few hours before integration.
I remember one of my first big dtrace wins - a multi-threaded application, developed in-house by our developers had some scalability problems on multi-cpu servers. They spent about a week looking for an issue without any progress. It was early just after dtrace was made public and I decided to give it a try. At first no real progress... while I was driving home the issue was still in a back of my mind. Suddenly I was 100% sure how to solve the issue with dtrace. First time in a morning I sat down with developers and we have fixed the problem in 5 minutes. We were working on a production code in a production environment. The era of DTrace has began...