I’m a big fan of Brendan Gregg. The DTrace Book that he co-authored with Jim Mauro stands one of the best I’ve read in Computer Science. While I continue to take my baby steps in DTrace, I thought I’d share with you my video log on attempting to explore ForgeRock OpenDJ using the pid provider in DTrace. Brendan Gregg has published a number of blogs around the pid provider, all of which is accessible from his consolidated blog entry here. OTN has very generously published one chapter from the DTrace Book that talks of using DTrace on Applications, in which the pid provider and its use is detailed.
And with the source code of all ForgeRock Products accessible to the public for study, DTrace might just be the tool that you may want to get your hands on for some fun.