Mark Dalrymple recently wrote a great series of posts at Big Nerd Ranch's blog on dtrace: https://www.google.com/search?q=dtrace+site%3Ablog.bignerdranch.com&aq

Mark Dalrymple recently wrote a great series of posts at Big Nerd Ranch's blog on dtrace: https://www.google.com/search?q=dtrace+site%3Ablog.bignerdranch.com&aq=f&oq=dtrace+site%3Ablog.bignerdranch.com&aqs=chrome.0.57.8616j0&sourceid=chrome&ie=UTF-8 https://www.google.com/search?q=dtrace+site%3Ablog.bignerdra.... Full disclosure: I work at Big Nerd Ranch.