DTrace is a comprehensive dynamic tracing facility for examining the behavior of both user programs and the operating system itself. With DTrace, you can collect data at strategic locations in your environment, referred to as probes. DTrace enables you to record such data as stack traces, timestamps, the arguments to a function, or simply counts of how often the probe fires. Because DTrace enables you to insert probes dynamically, you do not need to recompile your code. The DTrace BigAdmin System Administration Portal contains many links to articles, XPerts sessions, and other information about DTrace.