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DTRACE
Dynamic Tracing Framework for Mac OS X

Overview
Dynamic Tracing Framework for Mac OS X
Included in Leopard
Originally developed by Sun Microsystems as part of
OpenSolaris, and is open source software
Provides answers to arbitrary questions about the
behaviour of applications and the operating system

“DTrace is a comprehensive dynamic
tracing framework for Solaris (Mac OS X).
DTrace provides a powerful infrastructure to
permit administrators, developers, and
service personnel to concisely answer
arbitrary questions about the behavior of the
operating system and user programs.”
Sun Microsystems, The Solaris Dynamic Tracing (DTrace) Guide