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 DTrace is Sun Microsystem's dynamic tracing framework that allows developers to instrument a program with probes that have little to no effect on performance when not in use and very little when active. Probe data can be collected with scripts written in D (no, not that one). Mozilla DTrace support has been added by the Sun DTrace team and can be used on Solaris 10 and Mac OS X 10.5.

The DTrace probes currently built into the codebase may be enabled by default in the future, but for now you'll need to create a build with --enable-dtrace (on Mac OS X you also have to use at least the 10.5 SDK for --with-macos-sdk, unlike the common configuration that uses the 10.4 SDK).

Trunk nightly builds with shark support (*-mac-shark.dmg here) are built with --enable-dtrace.

Documentation

Writing Scripts
A general introduction to writing D scripts and using the built-in Mozilla probes.
Optimizing JavaScript with DTrace
A guide on profiling JavaScript code using DTrace.
Adding Probes
A guide on creating probes and the build system magic needed to add probes to your code.
Pounce on DTrace
A guide to using DTrace on Mac OS X 10.5.
DTrace for Web Developers
How to use DTrace to profile your web application.

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 Contributors to this page: teoli, Sheppy, Nickolay, MykMelez, Varmaa, David.humphrey, RyanFlint
 Last updated by: Sheppy,