rb_who.d - trace Ruby line execution by process using DTrace. rb_who.d This traces Ruby activity from all Ruby programs on the system that are running with Ruby provider support. Filenames are printed if available. Any Evolving - uses the DTrace Ruby provider, which may change as additional features are introduced. Check Ruby/Readme to see what version these scripts are based on.

Default output, # rb_who.d

PID Process ID of Ruby

UID User ID of the owner

LINES Number of times a line was executed

FILE Pathname of the Ruby program

See the DTraceToolkit for further documentation under the Examples, Notes and Docs directories. The example files may be especially useful as they aim to demonstrate how to interpret the output. rb_who.d will run until Ctrl-C is hit. Brendan Gregg [CA, USA] dtrace(1M)