pl_flow.d - snoop Perl execution showing subroutine flow. pl_flow.d This traces Perl activity from all Perl programs on the system running with Perl provider support. This watches Perl subroutine entries and returns, and indents child subroutine calls. Any Evolving - uses the DTrace Perl provider, which may change as additional features are introduced. Check Perl/Readme to see what version these scripts are based on.

Default output, # pl_flow.d

C CPU-id

TIME(us) Time since boot, us

FILE Filename that this subroutine belongs to

SUB Subroutine name

-> subroutine entry

<- subroutine return

Watch the first column carefully, it prints the CPU-id. If it changes, then it is very likely that the output has been shuffled.

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. pl_flow.d will run until Ctrl-C is hit. Brendan Gregg [CA, USA] dtrace(1M)