dTrace is one of those really, really cool technologies I wish I’d had back when I was a wookie^Wsysadmin. It lets you monitor and profile your system in ways which just weren’t possible before. It’s Solaris only at present, but it’s being ported to FreeBSD and Mac OS X.
But the cool thing is watching people apply it to their favorite languages. Hence, DTrace meets JavaScript. Find out where the time is really being spent in your page…
Jabbering Giraffe 