Tracing and Debugging with DTrace

DTrace is a comprehensive dynamic tracing facility that is built into the Solaris OS. The DTrace facility can be used to examine the behavior of your multithreaded program. DTrace inserts probes into running programs to collect data at points in the execution path that you specify. The collected data can be examined to determine problem areas. See the Solaris Dynamic Tracing Guide and the DTrace User Guide for more information about using DTrace.

The Sun Developers Network web site contains several articles about DTrace, including the DTrace Quick Reference Guide.