Python - DTracing Python These scripts trace the Python programming language, and require a version of Python which has been built with DTrace probes. The Python DTrace provider was originally written by John Levon, and was integrated into Solaris Nevada in build 65. If you are on a different OS with DTrace and would like to use these scripts, you could download Python and the Python DTrace provider patch listed in the comments here, http://blogs.sun.com/levon/entry/python_and_dtrace_in_build You will need patch and build Python for these probes to work. Or, check if a pre-built package is available someone on opensolaris.org. Since the DTrace Python provider may be developed further, there is a chance that it has changed slightly by the time you are reading this, causing these scripts to either break or behave oddly. Firstly, check for newer versions of the DTraceToolkit; if it hasn't been updated and you need to use these scripts immediately, then updating them shouldn't take too long. The following was the state of the provider when these scripts were written - check for changes and update the scripts accordingly, provider python { probe function-entry(file, subroutine, lineno) probe function-return(file, subroutine, lineno) };